.github/workflows/publish.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ${{matrix.os}}
     steps:
       - uses: actions/checkout@v3.0.0
-      - uses: actions/setup-java@v3.0.0
+      - uses: actions/setup-java@v3.10.0
         with:
           java-version: 11
           distribution: liberica
@@ -26,26 +26,25 @@ jobs:
           key: ${{ runner.os }}-gradle-${{ hashFiles('*.gradle.kts') }}
           restore-keys: |
             ${{ runner.os }}-gradle-
-      - uses: gradle/wrapper-validation-action@v1.0.4
       - name: Publish Windows Artifacts
         if: matrix.os == 'windows-latest'
-        uses: gradle/gradle-build-action@v2.1.5
+        uses: gradle/gradle-build-action@v2.4.0
         with:
           arguments: |
-            releaseAll
+            publishAllPublicationsToSpaceRepository
-            -Ppublishing.enabled=true
+            -Ppublishing.targets=all
-            -Ppublishing.sonatype=false
             -Ppublishing.space.user=${{ secrets.SPACE_APP_ID }}
             -Ppublishing.space.token=${{ secrets.SPACE_APP_SECRET }}
       - name: Publish Mac Artifacts
         if: matrix.os == 'macOS-latest'
-        uses: gradle/gradle-build-action@v2.1.5
+        uses: gradle/gradle-build-action@v2.4.0
         with:
           arguments: |
-            releaseMacosX64
+            publishMacosX64PublicationToSpaceRepository
-            releaseIosArm64
+            publishMacosArm64PublicationToSpaceRepository
-            releaseIosX64
+            publishIosX64PublicationToSpaceRepository
-            -Ppublishing.enabled=true
+            publishIosArm64PublicationToSpaceRepository
-            -Ppublishing.sonatype=false            
+            publishIosSimulatorArm64PublicationToSpaceRepository
+            -Ppublishing.targets=all
             -Ppublishing.space.user=${{ secrets.SPACE_APP_ID }}
             -Ppublishing.space.token=${{ secrets.SPACE_APP_SECRET }}

.gitignore

@@ -18,4 +18,5 @@ out/
 
 !/.idea/copyright/
 !/.idea/scopes/
-/kotlin-js-store/yarn.lock
+/gradle/yarn.lock
+

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## [Unreleased]
 ### Added
+- Generic builders for `BufferND` and `MutableBufferND`
 - `NamedMatrix` - matrix with symbol-based indexing
 - `Expression` with default arguments
 - Type-aliases for numbers like `Float64`
@@ -23,6 +24,7 @@
 ### Deprecated
 
 ### Removed
+- Trajectory moved to https://github.com/SciProgCentre/maps-kt
 - Polynomials moved to https://github.com/SciProgCentre/kmath-polynomial
 
 ### Fixed

build.gradle.kts

@@ -15,7 +15,7 @@ allprojects {
     }
 
     group = "space.kscience"
-    version = "0.3.1-dev-10"
+    version = "0.3.1-dev-11"
 }
 
 subprojects {

examples/build.gradle.kts

@@ -1,3 +1,5 @@
+import org.jetbrains.kotlin.gradle.tasks.KotlinJvmCompile
+
 plugins {
     kotlin("jvm")
 }
@@ -33,6 +35,8 @@ dependencies {
     implementation(project(":kmath-multik"))
     implementation("org.jetbrains.kotlinx:multik-default:$multikVersion")
 
+    //datetime
+    implementation("org.jetbrains.kotlinx:kotlinx-datetime:0.4.0")
 
     implementation("org.nd4j:nd4j-native:1.0.0-beta7")
 
@@ -46,25 +50,24 @@ dependencies {
 //    } else
     implementation("org.nd4j:nd4j-native-platform:1.0.0-beta7")
 
-    // multik implementation
-    implementation("org.jetbrains.kotlinx:multik-default:0.1.0")
-
     implementation("org.slf4j:slf4j-simple:1.7.32")
     // plotting
     implementation("space.kscience:plotlykt-server:0.5.0")
 }
 
-kotlin.sourceSets.all {
+kotlin {
+    jvmToolchain(11)
+    sourceSets.all {
         with(languageSettings) {
             optIn("kotlin.contracts.ExperimentalContracts")
             optIn("kotlin.ExperimentalUnsignedTypes")
             optIn("space.kscience.kmath.misc.UnstableKMathAPI")
         }
+    }
 }
 
-tasks.withType<org.jetbrains.kotlin.gradle.dsl.KotlinJvmCompile> {
+tasks.withType<KotlinJvmCompile> {
     kotlinOptions {
-        jvmTarget = "11"
         freeCompilerArgs = freeCompilerArgs + "-Xjvm-default=all" + "-Xopt-in=kotlin.RequiresOptIn" + "-Xlambdas=indy"
     }
 }

examples/src/main/kotlin/space/kscience/kmath/stat/DateTimeSeries.kt

@@ -0,0 +1,19 @@
+/*
+ * Copyright 2018-2023 KMath contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package space.kscience.kmath.stat
+
+import kotlinx.datetime.Instant
+import space.kscience.kmath.operations.algebra
+import space.kscience.kmath.operations.bufferAlgebra
+import space.kscience.kmath.series.MonotonicSeriesAlgebra
+import space.kscience.kmath.series.SeriesAlgebra
+import kotlin.time.Duration
+
+fun SeriesAlgebra.Companion.time(zero: Instant, step: Duration) = MonotonicSeriesAlgebra(
+    bufferAlgebra = Double.algebra.bufferAlgebra,
+    offsetToLabel = { zero + step * it },
+    labelToOffset = { (it - zero) / step }
+)

gradle.properties

@@ -9,7 +9,7 @@ kotlin.native.ignoreDisabledTargets=true
 org.gradle.configureondemand=true
 org.gradle.jvmargs=-Xmx4096m
 
-toolsVersion=0.14.2-kotlin-1.8.10
+toolsVersion=0.14.6-kotlin-1.8.20
 
 
 org.gradle.parallel=true

kmath-core/src/commonMain/kotlin/space/kscience/kmath/misc/Featured.kt

@@ -9,7 +9,7 @@ import kotlin.jvm.JvmInline
 import kotlin.reflect.KClass
 
 /**
- * A entity that contains a set of features defined by their types
+ * An entity that contains a set of features defined by their types
  */
 public interface Featured<F : Any> {
     public fun <T : F> getFeature(type: FeatureKey<T>): T?

kmath-core/src/commonMain/kotlin/space/kscience/kmath/misc/collections.kt

@@ -0,0 +1,22 @@
+/*
+ * Copyright 2018-2023 KMath contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package space.kscience.kmath.misc
+
+/**
+ * The same as [zipWithNext], but includes link between last and first element
+ */
+public inline fun <T, R> List<T>.zipWithNextCircular(transform: (a: T, b: T) -> R): List<R> {
+    if (isEmpty()) return emptyList()
+    return indices.map { i ->
+        if (i == size - 1) {
+            transform(last(), first())
+        } else {
+            transform(get(i), get(i + 1))
+        }
+    }
+}
+
+public inline fun <T> List<T>.zipWithNextCircular(): List<Pair<T,T>> = zipWithNextCircular { l, r -> l to r  }

kmath-core/src/commonMain/kotlin/space/kscience/kmath/nd/BufferND.kt

@@ -7,7 +7,9 @@ package space.kscience.kmath.nd
 
 import space.kscience.kmath.misc.PerformancePitfall
 import space.kscience.kmath.structures.Buffer
+import space.kscience.kmath.structures.BufferFactory
 import space.kscience.kmath.structures.MutableBuffer
+import space.kscience.kmath.structures.MutableBufferFactory
 
 /**
  * Represents [StructureND] over [Buffer].
@@ -29,6 +31,18 @@ public open class BufferND<out T>(
     override fun toString(): String = StructureND.toString(this)
 }
 
+/**
+ * Create a generic [BufferND] using provided [initializer]
+ */
+public fun <T> BufferND(
+    shape: ShapeND,
+    bufferFactory: BufferFactory<T> = BufferFactory.boxing(),
+    initializer: (IntArray) -> T,
+): BufferND<T> {
+    val strides = Strides(shape)
+    return BufferND(strides, bufferFactory(strides.linearSize) { initializer(strides.index(it)) })
+}
+
 ///**
 // * Transform structure to a new structure using provided [BufferFactory] and optimizing if argument is [BufferND]
 // */
@@ -67,6 +81,18 @@ public open class MutableBufferND<T>(
     }
 }
 
+/**
+ * Create a generic [BufferND] using provided [initializer]
+ */
+public fun <T> MutableBufferND(
+    shape: ShapeND,
+    bufferFactory: MutableBufferFactory<T> = MutableBufferFactory.boxing(),
+    initializer: (IntArray) -> T,
+): MutableBufferND<T> {
+    val strides = Strides(shape)
+    return MutableBufferND(strides, bufferFactory(strides.linearSize) { initializer(strides.index(it)) })
+}
+
 ///**
 // * Transform structure to a new structure using provided [MutableBufferFactory] and optimizing if argument is [MutableBufferND]
 // */

kmath-coroutines/src/commonMain/kotlin/space/kscience/kmath/coroutines/coroutinesExtra.kt

@@ -8,6 +8,7 @@
 package space.kscience.kmath.coroutines
 
 import kotlinx.coroutines.*
+import kotlinx.coroutines.channels.ReceiveChannel
 import kotlinx.coroutines.channels.produce
 import kotlinx.coroutines.flow.*
 
@@ -57,7 +58,7 @@ public suspend fun <T> AsyncFlow<T>.collect(concurrency: Int, collector: FlowCol
 
     coroutineScope {
         //Starting up to N deferred coroutines ahead of time
-        val channel = produce(capacity = concurrency - 1) {
+        val channel: ReceiveChannel<LazyDeferred<T>> = produce(capacity = concurrency - 1) {
             deferredFlow.collect { value ->
                 value.start(this@coroutineScope)
                 send(value)

kmath-functions/src/commonMain/kotlin/space/kscience/kmath/integration/GaussIntegratorRuleFactory.kt

@@ -9,7 +9,6 @@ import space.kscience.kmath.operations.mapToBuffer
 import space.kscience.kmath.structures.Buffer
 import space.kscience.kmath.structures.DoubleBuffer
 import space.kscience.kmath.structures.asBuffer
-import kotlin.jvm.Synchronized
 import kotlin.math.ulp
 import kotlin.native.concurrent.ThreadLocal
 
@@ -57,7 +56,6 @@ public object GaussLegendreRuleFactory : GaussIntegratorRuleFactory {
 
     private val cache = HashMap<Int, Pair<Buffer<Double>, Buffer<Double>>>()
 
-    @Synchronized
     private fun getOrBuildRule(numPoints: Int): Pair<Buffer<Double>, Buffer<Double>> =
         cache.getOrPut(numPoints) { buildRule(numPoints) }
 

kmath-geometry/src/commonMain/kotlin/space/kscience/kmath/geometry/Euclidean3DSpace.kt

@@ -78,8 +78,11 @@ public object Euclidean3DSpace : GeometrySpace<DoubleVector3D>, ScaleOperations<
         }
     }
 
+    public fun vector(x: Double, y: Double, z: Double): DoubleVector3D =
+        Vector3DImpl(x, y, z)
+
     public fun vector(x: Number, y: Number, z: Number): DoubleVector3D =
-        Vector3DImpl(x.toDouble(), y.toDouble(), z.toDouble())
+        vector(x.toDouble(), y.toDouble(), z.toDouble())
 
     override val zero: DoubleVector3D by lazy { vector(0.0, 0.0, 0.0) }
 
@@ -100,6 +103,46 @@ public object Euclidean3DSpace : GeometrySpace<DoubleVector3D>, ScaleOperations<
     override fun DoubleVector3D.dot(other: DoubleVector3D): Double =
         x * other.x + y * other.y + z * other.z
 
+    private fun leviCivita(i: Int, j: Int, k: Int): Int = when {
+        // even permutation
+        i == 0 && j == 1 && k == 2 -> 1
+        i == 1 && j == 2 && k == 0 -> 1
+        i == 2 && j == 0 && k == 1 -> 1
+        // odd permutations
+        i == 2 && j == 1 && k == 0 -> -1
+        i == 0 && j == 2 && k == 1 -> -1
+        i == 1 && j == 0 && k == 2 -> -1
+
+        else -> 0
+    }
+
+    /**
+     * Compute vector product of [first] and [second]. The basis assumed to be right-handed.
+     */
+    public fun vectorProduct(
+        first: DoubleVector3D,
+        second: DoubleVector3D,
+    ): DoubleVector3D {
+        var x = 0.0
+        var y = 0.0
+        var z = 0.0
+
+        for (j in (0..2)) {
+            for (k in (0..2)) {
+                x += leviCivita(0, j, k) * first[j] * second[k]
+                y += leviCivita(1, j, k) * first[j] * second[k]
+                z += leviCivita(2, j, k) * first[j] * second[k]
+            }
+        }
+
+        return vector(x, y, z)
+    }
+
+    /**
+     * Vector product with right basis
+     */
+    public infix fun DoubleVector3D.cross(other: DoubleVector3D): Vector3D<Double> = vectorProduct(this, other)
+
     public val xAxis: DoubleVector3D = vector(1.0, 0.0, 0.0)
     public val yAxis: DoubleVector3D = vector(0.0, 1.0, 0.0)
     public val zAxis: DoubleVector3D = vector(0.0, 0.0, 1.0)

kmath-geometry/src/commonMain/kotlin/space/kscience/kmath/geometry/Line.kt

@@ -5,14 +5,23 @@
 
 package space.kscience.kmath.geometry
 
+import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 
 /**
- * A line formed by [base] vector of start and a [direction] vector. Direction vector is not necessarily normalized,
+ * A line formed by [start] vector of start and a [direction] vector. Direction vector is not necessarily normalized,
  * but its length does not affect line properties
  */
+public interface Line<out V : Vector> {
+    public val start: V
+    public val direction: V
+}
+
 @Serializable
-public data class Line<out V : Vector>(val base: V, val direction: V)
+@SerialName("Line")
+private data class LineImpl<out V : Vector>(override val start: V, override val direction: V): Line<V>
+
+public fun <V : Vector> Line(base: V, direction: V): Line<V> = LineImpl(base, direction)
 
 public typealias Line2D = Line<DoubleVector2D>
 public typealias Line3D = Line<DoubleVector3D>
@@ -20,8 +29,19 @@ public typealias Line3D = Line<DoubleVector3D>
 /**
  * A directed line segment between [begin] and [end]
  */
+public interface LineSegment<out V : Vector> {
+    public val begin: V
+    public val end: V
+}
+
+/**
+ * Basic implementation for [LineSegment]
+ */
 @Serializable
-public data class LineSegment<out V : Vector>(val begin: V, val end: V)
+@SerialName("LineSegment")
+private data class LineSegmentImpl<out V : Vector>(override val begin: V, override val end: V) : LineSegment<V>
+
+public fun <V : Vector> LineSegment(begin: V, end: V): LineSegment<V> = LineSegmentImpl(begin, end)
 
 public fun <V : Vector> LineSegment<V>.line(algebra: GeometrySpace<V>): Line<V> = with(algebra) {
     Line(begin, end - begin)

kmath-geometry/src/commonMain/kotlin/space/kscience/kmath/geometry/Polygon.kt

@@ -0,0 +1,14 @@
+/*
+ * Copyright 2018-2023 KMath contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package space.kscience.kmath.geometry
+
+
+/**
+ * A closed polygon in 2D space
+ */
+public interface Polygon<T> {
+    public val points: List<Vector2D<T>>
+}

kmath-geometry/src/commonMain/kotlin/space/kscience/kmath/geometry/projections.kt

@@ -13,7 +13,7 @@ package space.kscience.kmath.geometry
  * @param line line to which vector should be projected
  */
 public fun <V : Vector> GeometrySpace<V>.projectToLine(vector: V, line: Line<V>): V = with(line) {
-    base + (direction dot (vector - base)) / (direction dot direction) * direction
+    start + (direction dot (vector - start)) / (direction dot direction) * direction
 }
 
 /**

kmath-geometry/src/commonTest/kotlin/space/kscience/kmath/geometry/Euclidean3DSpaceTest.kt

@@ -57,8 +57,7 @@ internal class Euclidean3DSpaceTest {
     }
 
     @Test
-    fun add() {
+    fun add() = with(Euclidean3DSpace) {
-        with(Euclidean3DSpace) {
         assertVectorEquals(
             vector(1.0, -2.0, 0.001),
             vector(1.0, -2.0, 0.001) + zero
@@ -68,12 +67,28 @@ internal class Euclidean3DSpaceTest {
             vector(1.0, 2.0, 3.0) + vector(7.0, -5.0, 0.001)
         )
     }
+
+    @Test
+    fun multiply() = with(Euclidean3DSpace) {
+        assertVectorEquals(vector(2.0, -4.0, 0.0), vector(1.0, -2.0, 0.0) * 2)
     }
 
     @Test
-    fun multiply() {
+    fun vectorProduct() = with(Euclidean3DSpace) {
-        with(Euclidean3DSpace) {
+        assertVectorEquals(zAxis, vectorProduct(xAxis, yAxis))
-            assertVectorEquals(vector(2.0, -4.0, 0.0), vector(1.0, -2.0, 0.0) * 2)
+        assertVectorEquals(zAxis, xAxis cross yAxis)
+        assertVectorEquals(-zAxis, vectorProduct(yAxis, xAxis))
     }
+
+    @Test
+    fun doubleVectorProduct() = with(Euclidean3DSpace) {
+        val a = vector(1, 2, -3)
+        val b = vector(-1, 0, 1)
+        val c = vector(4, 5, 6)
+
+        val res = a cross (b cross c)
+        val expected = b * (a dot c) - c * (a dot b)
+        assertVectorEquals(expected, res)
     }
+
 }

kmath-geometry/src/commonTest/kotlin/space/kscience/kmath/geometry/ProjectionOntoLineTest.kt

@@ -63,7 +63,7 @@ internal class ProjectionOntoLineTest {
 
     @Test
     fun projectionOntoLine3d() = with(Euclidean3DSpace) {
-        val line = Line3D(
+        val line = Line(
             base = vector(1.0, 3.5, 0.07),
             direction = vector(2.0, -0.0037, 11.1111)
         )
@@ -77,7 +77,7 @@ internal class ProjectionOntoLineTest {
                     val result = projectToLine(v, line)
 
                     // assert that result is on the line
-                    assertTrue(isCollinear(result - line.base, line.direction))
+                    assertTrue(isCollinear(result - line.start, line.direction))
                     // assert that PV vector is orthogonal to direction vector
                     assertTrue(isOrthogonal(v - result, line.direction))
                 }

kmath-stat/src/commonMain/kotlin/space/kscience/kmath/series/MonotonicSeriesAlgebra.kt

@@ -0,0 +1,47 @@
+/*
+ * Copyright 2018-2023 KMath contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package space.kscience.kmath.series
+
+import space.kscience.kmath.operations.BufferAlgebra
+import space.kscience.kmath.operations.Ring
+import space.kscience.kmath.structures.Buffer
+import kotlin.math.ceil
+import kotlin.math.floor
+
+/**
+ * A [SeriesAlgebra] with reverse label to index transformation.
+ *
+ * @param [labelToOffset] returns floating point number that is used for index resolution.
+ */
+public class MonotonicSeriesAlgebra<T, out A : Ring<T>, out BA : BufferAlgebra<T, A>, L : Comparable<L>>(
+    bufferAlgebra: BA,
+    offsetToLabel: (Int) -> L,
+    private val labelToOffset: (L) -> Double,
+) : SeriesAlgebra<T, A, BA, L>(bufferAlgebra, offsetToLabel) {
+
+    public val Buffer<T>.labelRange: ClosedRange<L> get() = offsetToLabel(startOffset)..offsetToLabel(startOffset + size)
+
+    /**
+     * An offset of the given [label] rounded down
+     */
+    public fun floorOffset(label: L): Int = floor(labelToOffset(label)).toInt()
+
+    /**
+     * An offset of the given [label] rounded up
+     */
+    public fun ceilOffset(label: L): Int = ceil(labelToOffset(label)).toInt()
+
+    /**
+     * Get value by label (rounded down) or return null if the value is outside series boundaries.
+     */
+    public fun Buffer<T>.getByLabelOrNull(label: L): T? = getByOffsetOrNull(floorOffset(label))
+
+    /**
+     * Get value by label (rounded down) or throw [IndexOutOfBoundsException] if the value is outside series boundaries.
+     */
+    public fun Buffer<T>.getByLabel(label: L): T = getByLabelOrNull(label)
+        ?: throw IndexOutOfBoundsException("Label $label is not in $labelRange")
+}

kmath-stat/src/commonMain/kotlin/space/kscience/kmath/series/SeriesAlgebra.kt

@@ -6,6 +6,7 @@ import space.kscience.kmath.operations.RingOps
 import space.kscience.kmath.stat.StatisticalAlgebra
 import space.kscience.kmath.structures.Buffer
 import space.kscience.kmath.structures.BufferView
+import space.kscience.kmath.structures.getOrNull
 import kotlin.math.max
 import kotlin.math.min
 
@@ -23,7 +24,9 @@ internal operator fun IntRange.contains(other: IntRange): Boolean = (other.first
 //TODO add permutation sort
 //TODO check rank statistics
 
-
+/**
+ * A [Buffer] with an offset relative to the [SeriesAlgebra] zero.
+ */
 public interface Series<T> : Buffer<T> {
     public val origin: Buffer<T>
 
@@ -33,8 +36,6 @@ public interface Series<T> : Buffer<T> {
     public val position: Int
 }
 
-public val <T> Series<T>.absoluteIndices: IntRange get() = position until position + size
-
 /**
  * A [BufferView] with index offset (both positive and negative) and possible size change
  */
@@ -55,59 +56,75 @@ private class SeriesImpl<T>(
 /**
  * A scope to operation on series
  */
-public class SeriesAlgebra<T, out A : Ring<T>, out BA : BufferAlgebra<T, A>, L>(
+public open class SeriesAlgebra<T, out A : Ring<T>, out BA : BufferAlgebra<T, A>, L>(
     override val bufferAlgebra: BA,
-    private val labelResolver: (Int) -> L,
+    public val offsetToLabel: (Int) -> L,
 ) : RingOps<Buffer<T>>, StatisticalAlgebra<T, A, BA> {
 
-    public val Buffer<T>.indices: IntRange
+    /**
+     * A range of valid offset indices. In general, does not start with zero.
+     */
+    public val Buffer<T>.offsetIndices: IntRange
         get() = if (this is Series) {
-            absoluteIndices
+            position until position + size
         } else {
             0 until size
         }
 
     /**
-     * Get the value by absolute index in the series algebra or return null if index is out of range
+     * Get the value by absolute offset in the series algebra or return null if index is out of range
      */
-    public fun Buffer<T>.getAbsoluteOrNull(index: Int): T? = when {
+    public fun Buffer<T>.getByOffsetOrNull(index: Int): T? = when {
-        index !in indices -> null
+        index !in offsetIndices -> null
-        this is Series -> origin[index - position]
+        this is Series -> origin.getOrNull(index - position)
-        else -> get(index)
+        else -> getOrNull(index)
     }
 
     /**
      * Get the value by absolute index in the series algebra or throw [IndexOutOfBoundsException] if index is out of range
      */
-    public fun Buffer<T>.getAbsolute(index: Int): T =
+    public fun Buffer<T>.getByOffset(index: Int): T =
-        getAbsoluteOrNull(index) ?: throw IndexOutOfBoundsException("Index $index is not in $indices")
+        getByOffsetOrNull(index) ?: throw IndexOutOfBoundsException("Index $index is not in $offsetIndices")
 
     /**
-     * Create an offset series with index starting point at [index]
+     *  Zero-copy move [Buffer] or [Series] to given [position] ignoring series offset if it is present.
      */
-    public fun Buffer<T>.moveTo(index: Int): Series<T> = if (this is Series) {
+    public fun Buffer<T>.moveTo(position: Int): Series<T> = if (this is Series) {
-        SeriesImpl(origin, index, size)
+        SeriesImpl(origin, position, size)
     } else {
-        SeriesImpl(this, index, size)
+        SeriesImpl(this, position, size)
     }
 
-    public val Buffer<T>.offset: Int get() = if (this is Series) position else 0
+    /**
+     * Zero-copy move [Buffer] or [Series] by given [offset]. If it is [Series], sum intrinsic series position and the [offset].
+     */
+    public fun Buffer<T>.moveBy(offset: Int): Series<T> = if (this is Series) {
+        SeriesImpl(origin, position + offset, size)
+    } else {
+        SeriesImpl(this, offset, size)
+    }
 
     /**
-     * Build a new series
+     * An offset of the buffer start relative to [SeriesAlgebra] zero offset
      */
-    public fun series(size: Int, fromIndex: Int = 0, block: A.(label: L) -> T): Series<T> {
+    public val Buffer<T>.startOffset: Int get() = if (this is Series) position else 0
+
+    public val Buffer<T>.startLabel: L get() = offsetToLabel(startOffset)
+
+    /**
+     * Build a new series positioned at [startOffset].
+     */
+    public fun series(size: Int, startOffset: Int = 0, block: A.(label: L) -> T): Series<T> {
         return elementAlgebra.bufferFactory(size) {
-            val index = it + fromIndex
+            val index = it + startOffset
-            elementAlgebra.block(labelResolver(index))
+            elementAlgebra.block(offsetToLabel(index))
-        }.moveTo(fromIndex)
+        }.moveTo(startOffset)
     }
 
     /**
      * Get a label buffer for given buffer.
      */
-    public val Buffer<T>.labels: List<L> get() = indices.map(labelResolver)
+    public val Buffer<T>.labels: List<L> get() = offsetIndices.map(offsetToLabel)
-
 
     /**
      * Try to resolve element by label and return null if element with a given label is not found
@@ -115,7 +132,7 @@ public class SeriesAlgebra<T, out A : Ring<T>, out BA : BufferAlgebra<T, A>, L>(
     public operator fun Buffer<T>.get(label: L): T? {
         val index = labels.indexOf(label)
         if (index == -1) return null
-        return getAbsolute(index + offset)
+        return getByOffset(index + startOffset)
     }
 
     /**
@@ -123,9 +140,9 @@ public class SeriesAlgebra<T, out A : Ring<T>, out BA : BufferAlgebra<T, A>, L>(
      */
     public inline fun Buffer<T>.map(crossinline transform: A.(T) -> T): Series<T> {
         val buf = elementAlgebra.bufferFactory(size) {
-            elementAlgebra.transform(getAbsolute(it))
+            elementAlgebra.transform(getByOffset(it))
         }
-        return buf.moveTo(indices.first)
+        return buf.moveTo(offsetIndices.first)
     }
 
     /**
@@ -134,22 +151,22 @@ public class SeriesAlgebra<T, out A : Ring<T>, out BA : BufferAlgebra<T, A>, L>(
     public inline fun Buffer<T>.mapWithLabel(crossinline transform: A.(arg: T, label: L) -> T): Series<T> {
         val labels = labels
         val buf = elementAlgebra.bufferFactory(size) {
-            elementAlgebra.transform(getAbsolute(it), labels[it])
+            elementAlgebra.transform(getByOffset(it), labels[it])
         }
-        return buf.moveTo(indices.first)
+        return buf.moveTo(offsetIndices.first)
     }
 
     public inline fun <R> Buffer<T>.fold(initial: R, operation: A.(acc: R, T) -> R): R {
         var accumulator = initial
-        for (index in this.indices) accumulator = elementAlgebra.operation(accumulator, getAbsolute(index))
+        for (index in this.offsetIndices) accumulator = elementAlgebra.operation(accumulator, getByOffset(index))
         return accumulator
     }
 
     public inline fun <R> Buffer<T>.foldWithLabel(initial: R, operation: A.(acc: R, arg: T, label: L) -> R): R {
         val labels = labels
         var accumulator = initial
-        for (index in this.indices) accumulator =
+        for (index in this.offsetIndices) accumulator =
-            elementAlgebra.operation(accumulator, getAbsolute(index), labels[index])
+            elementAlgebra.operation(accumulator, getByOffset(index), labels[index])
         return accumulator
     }
 
@@ -160,11 +177,11 @@ public class SeriesAlgebra<T, out A : Ring<T>, out BA : BufferAlgebra<T, A>, L>(
         other: Buffer<T>,
         crossinline operation: A.(left: T, right: T) -> T,
     ): Series<T> {
-        val newRange = indices.intersect(other.indices)
+        val newRange = offsetIndices.intersect(other.offsetIndices)
         return elementAlgebra.bufferFactory(newRange.size) {
             elementAlgebra.operation(
-                getAbsolute(it),
+                getByOffset(it),
-                other.getAbsolute(it)
+                other.getByOffset(it)
             )
         }.moveTo(newRange.first)
     }
@@ -174,6 +191,8 @@ public class SeriesAlgebra<T, out A : Ring<T>, out BA : BufferAlgebra<T, A>, L>(
     override fun add(left: Buffer<T>, right: Buffer<T>): Series<T> = left.zip(right) { l, r -> l + r }
 
     override fun multiply(left: Buffer<T>, right: Buffer<T>): Buffer<T> = left.zip(right) { l, r -> l * r }
+
+    public companion object
 }
 
 public fun <T, A : Ring<T>, BA : BufferAlgebra<T, A>, L> BA.seriesAlgebra(labels: Iterable<L>): SeriesAlgebra<T, A, BA, L> {

kmath-stat/src/commonMain/kotlin/space/kscience/kmath/series/seriesExtensions.kt

@@ -12,32 +12,32 @@ import space.kscience.kmath.structures.Buffer
 public fun <T, BA> SeriesAlgebra<T, *, BA, *>.sin(
     arg: Buffer<T>,
 ): Series<T> where BA : BufferAlgebra<T, *>, BA : TrigonometricOperations<Buffer<T>> =
-    bufferAlgebra.sin(arg).moveTo(arg.offset)
+    bufferAlgebra.sin(arg).moveTo(arg.startOffset)
 
 public fun <T, BA> SeriesAlgebra<T, *, BA, *>.cos(
     arg: Buffer<T>,
 ): Series<T> where BA : BufferAlgebra<T, *>, BA : TrigonometricOperations<Buffer<T>> =
-    bufferAlgebra.cos(arg).moveTo(arg.offset)
+    bufferAlgebra.cos(arg).moveTo(arg.startOffset)
 
 public fun <T, BA> SeriesAlgebra<T, *, BA, *>.tan(
     arg: Buffer<T>,
 ): Series<T> where BA : BufferAlgebra<T, *>, BA : TrigonometricOperations<Buffer<T>> =
-    bufferAlgebra.tan(arg).moveTo(arg.offset)
+    bufferAlgebra.tan(arg).moveTo(arg.startOffset)
 
 public fun <T, BA> SeriesAlgebra<T, *, BA, *>.asin(
     arg: Buffer<T>,
 ): Series<T> where BA : BufferAlgebra<T, *>, BA : TrigonometricOperations<Buffer<T>> =
-    bufferAlgebra.asin(arg).moveTo(arg.offset)
+    bufferAlgebra.asin(arg).moveTo(arg.startOffset)
 
 public fun <T, BA> SeriesAlgebra<T, *, BA, *>.acos(
     arg: Buffer<T>,
 ): Series<T> where BA : BufferAlgebra<T, *>, BA : TrigonometricOperations<Buffer<T>> =
-    bufferAlgebra.acos(arg).moveTo(arg.offset)
+    bufferAlgebra.acos(arg).moveTo(arg.startOffset)
 
 public fun <T, BA> SeriesAlgebra<T, *, BA, *>.atan(
     arg: Buffer<T>,
 ): Series<T> where BA : BufferAlgebra<T, *>, BA : TrigonometricOperations<Buffer<T>> =
-    bufferAlgebra.atan(arg).moveTo(arg.offset)
+    bufferAlgebra.atan(arg).moveTo(arg.startOffset)
 
 
 //exponential
@@ -45,42 +45,42 @@ public fun <T, BA> SeriesAlgebra<T, *, BA, *>.atan(
 public fun <T, BA> SeriesAlgebra<T, *, BA, *>.exp(
     arg: Buffer<T>,
 ): Series<T> where BA : BufferAlgebra<T, *>, BA : ExponentialOperations<Buffer<T>> =
-    bufferAlgebra.exp(arg).moveTo(arg.offset)
+    bufferAlgebra.exp(arg).moveTo(arg.startOffset)
 
 public fun <T, BA> SeriesAlgebra<T, *, BA, *>.ln(
     arg: Buffer<T>,
 ): Series<T> where BA : BufferAlgebra<T, *>, BA : ExponentialOperations<Buffer<T>> =
-    bufferAlgebra.ln(arg).moveTo(arg.offset)
+    bufferAlgebra.ln(arg).moveTo(arg.startOffset)
 
 public fun <T, BA> SeriesAlgebra<T, *, BA, *>.sinh(
     arg: Buffer<T>,
 ): Series<T> where BA : BufferAlgebra<T, *>, BA : ExponentialOperations<Buffer<T>> =
-    bufferAlgebra.sinh(arg).moveTo(arg.offset)
+    bufferAlgebra.sinh(arg).moveTo(arg.startOffset)
 
 public fun <T, BA> SeriesAlgebra<T, *, BA, *>.cosh(
     arg: Buffer<T>,
 ): Series<T> where BA : BufferAlgebra<T, *>, BA : ExponentialOperations<Buffer<T>> =
-    bufferAlgebra.cosh(arg).moveTo(arg.offset)
+    bufferAlgebra.cosh(arg).moveTo(arg.startOffset)
 
 public fun <T, BA> SeriesAlgebra<T, *, BA, *>.tanh(
     arg: Buffer<T>,
 ): Series<T> where BA : BufferAlgebra<T, *>, BA : ExponentialOperations<Buffer<T>> =
-    bufferAlgebra.tanh(arg).moveTo(arg.offset)
+    bufferAlgebra.tanh(arg).moveTo(arg.startOffset)
 
 public fun <T, BA> SeriesAlgebra<T, *, BA, *>.asinh(
     arg: Buffer<T>,
 ): Series<T> where BA : BufferAlgebra<T, *>, BA : ExponentialOperations<Buffer<T>> =
-    bufferAlgebra.asinh(arg).moveTo(arg.offset)
+    bufferAlgebra.asinh(arg).moveTo(arg.startOffset)
 
 public fun <T, BA> SeriesAlgebra<T, *, BA, *>.acosh(
     arg: Buffer<T>,
 ): Series<T> where BA : BufferAlgebra<T, *>, BA : ExponentialOperations<Buffer<T>> =
-    bufferAlgebra.acosh(arg).moveTo(arg.offset)
+    bufferAlgebra.acosh(arg).moveTo(arg.startOffset)
 
 public fun <T, BA> SeriesAlgebra<T, *, BA, *>.atanh(
     arg: Buffer<T>,
 ): Series<T> where BA : BufferAlgebra<T, *>, BA : ExponentialOperations<Buffer<T>> =
-    bufferAlgebra.atanh(arg).moveTo(arg.offset)
+    bufferAlgebra.atanh(arg).moveTo(arg.startOffset)
 
 
 //power
@@ -89,9 +89,9 @@ public fun <T, BA> SeriesAlgebra<T, *, BA, *>.power(
     arg: Buffer<T>,
     pow: Number,
 ): Series<T> where BA : BufferAlgebra<T, *>, BA : PowerOperations<Buffer<T>> =
-    bufferAlgebra.power(arg, pow).moveTo(arg.offset)
+    bufferAlgebra.power(arg, pow).moveTo(arg.startOffset)
 
 public fun <T, BA> SeriesAlgebra<T, *, BA, *>.sqrt(
     arg: Buffer<T>,
 ): Series<T> where BA : BufferAlgebra<T, *>, BA : PowerOperations<Buffer<T>> =
-    bufferAlgebra.sqrt(arg).moveTo(arg.offset)
+    bufferAlgebra.sqrt(arg).moveTo(arg.startOffset)

kmath-trajectory/README.md

@@ -1,34 +0,0 @@
-# kmath-trajectory
-
-
-
-
-## Artifact:
-
-The Maven coordinates of this project are `space.kscience:kmath-trajectory:0.3.1-dev-1`.
-
-**Gradle Groovy:**
-```groovy
-repositories {
-    maven { url 'https://repo.kotlin.link' }
-    mavenCentral()
-}
-
-dependencies {
-    implementation 'space.kscience:kmath-trajectory:0.3.1-dev-1'
-}
-```
-**Gradle Kotlin DSL:**
-```kotlin
-repositories {
-    maven("https://repo.kotlin.link")
-    mavenCentral()
-}
-
-dependencies {
-    implementation("space.kscience:kmath-trajectory:0.3.1-dev-1")
-}
-```
-
-## Contributors
-Erik Schouten (github: @ESchouten, email: erik-schouten@hotmail.nl)

kmath-trajectory/build.gradle.kts

@@ -1,21 +0,0 @@
-plugins {
-    id("space.kscience.gradle.mpp")
-}
-
-kscience{
-    jvm()
-    js()
-    native()
-
-    useContextReceivers()
-    useSerialization()
-    dependencies {
-        api(projects.kmath.kmathGeometry)
-    }
-}
-
-readme {
-    description = "Path and trajectory optimization"
-    maturity = space.kscience.gradle.Maturity.PROTOTYPE
-    propertyByTemplate("artifact", rootProject.file("docs/templates/ARTIFACT-TEMPLATE.md"))
-}

kmath-trajectory/docs/README-TEMPLATE.md

@@ -1,13 +0,0 @@
-# kmath-trajectory
-
-
-${features}
-
-${artifact}
-
-## Author
-Erik Schouten
-
-Github: ESchouten
-
-Email: erik-schouten@hotmail.nl

kmath-trajectory/src/commonMain/kotlin/space/kscience/kmath/trajectory/DubinsPath.kt

@@ -1,255 +0,0 @@
-/*
- * Copyright 2018-2022 KMath contributors.
- * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
- */
-
-package space.kscience.kmath.trajectory
-
-import space.kscience.kmath.geometry.*
-import space.kscience.kmath.geometry.Euclidean2DSpace.distanceTo
-import kotlin.math.acos
-
-internal fun DubinsPose2D.getLeftCircle(radius: Double): Circle2D = getTangentCircles(radius).first
-
-internal fun DubinsPose2D.getRightCircle(radius: Double): Circle2D = getTangentCircles(radius).second
-
-internal fun DubinsPose2D.getTangentCircles(radius: Double): Pair<Circle2D, Circle2D> = with(Euclidean2DSpace) {
-    val dX = radius * cos(bearing)
-    val dY = radius * sin(bearing)
-    return Circle2D(vector(x - dX, y + dY), radius) to Circle2D(vector(x + dX, y - dY), radius)
-}
-
-internal fun leftOuterTangent(a: Circle2D, b: Circle2D): StraightTrajectory2D =
-    outerTangent(a, b, CircleTrajectory2D.Direction.LEFT)
-
-internal fun rightOuterTangent(a: Circle2D, b: Circle2D): StraightTrajectory2D = outerTangent(
-    a, b,
-    CircleTrajectory2D.Direction.RIGHT
-)
-
-private fun outerTangent(a: Circle2D, b: Circle2D, side: CircleTrajectory2D.Direction): StraightTrajectory2D =
-    with(Euclidean2DSpace) {
-        val centers = StraightTrajectory2D(a.center, b.center)
-        val p1 = when (side) {
-            CircleTrajectory2D.Direction.LEFT -> vector(
-                a.center.x - a.radius * cos(centers.bearing),
-                a.center.y + a.radius * sin(centers.bearing)
-            )
-
-            CircleTrajectory2D.Direction.RIGHT -> vector(
-                a.center.x + a.radius * cos(centers.bearing),
-                a.center.y - a.radius * sin(centers.bearing)
-            )
-        }
-        return StraightTrajectory2D(
-            p1,
-            vector(p1.x + (centers.end.x - centers.start.x), p1.y + (centers.end.y - centers.start.y))
-        )
-    }
-
-internal fun leftInnerTangent(base: Circle2D, direction: Circle2D): StraightTrajectory2D? =
-    innerTangent(base, direction, CircleTrajectory2D.Direction.LEFT)
-
-internal fun rightInnerTangent(base: Circle2D, direction: Circle2D): StraightTrajectory2D? =
-    innerTangent(base, direction, CircleTrajectory2D.Direction.RIGHT)
-
-private fun innerTangent(
-    base: Circle2D,
-    direction: Circle2D,
-    side: CircleTrajectory2D.Direction,
-): StraightTrajectory2D? =
-    with(Euclidean2DSpace) {
-        val centers = StraightTrajectory2D(base.center, direction.center)
-        if (centers.length < base.radius * 2) return null
-        val angle = when (side) {
-            CircleTrajectory2D.Direction.LEFT -> centers.bearing + acos(base.radius * 2 / centers.length).radians
-            CircleTrajectory2D.Direction.RIGHT -> centers.bearing - acos(base.radius * 2 / centers.length).radians
-        }.normalized()
-
-        val dX = base.radius * sin(angle)
-        val dY = base.radius * cos(angle)
-        val p1 = vector(base.center.x + dX, base.center.y + dY)
-        val p2 = vector(direction.center.x - dX, direction.center.y - dY)
-        return StraightTrajectory2D(p1, p2)
-    }
-
-
-@Suppress("DuplicatedCode")
-public object DubinsPath {
-
-    public enum class Type {
-        RLR, LRL, RSR, LSL, RSL, LSR
-    }
-
-    /**
-     * Return Dubins trajectory type or null if trajectory is not a Dubins path
-     */
-    public fun trajectoryTypeOf(trajectory2D: CompositeTrajectory2D): Type? {
-        if (trajectory2D.segments.size != 3) return null
-        val a = trajectory2D.segments.first() as? CircleTrajectory2D ?: return null
-        val b = trajectory2D.segments[1]
-        val c = trajectory2D.segments.last() as? CircleTrajectory2D ?: return null
-        return Type.valueOf(
-            arrayOf(
-                a.direction.name[0],
-                if (b is CircleTrajectory2D) b.direction.name[0] else 'S',
-                c.direction.name[0]
-            ).toCharArray().concatToString()
-        )
-    }
-
-    public fun all(
-        start: DubinsPose2D,
-        end: DubinsPose2D,
-        turningRadius: Double,
-    ): List<CompositeTrajectory2D> = listOfNotNull(
-        rlr(start, end, turningRadius),
-        lrl(start, end, turningRadius),
-        rsr(start, end, turningRadius),
-        lsl(start, end, turningRadius),
-        rsl(start, end, turningRadius),
-        lsr(start, end, turningRadius)
-    )
-
-    public fun shortest(start: DubinsPose2D, end: DubinsPose2D, turningRadius: Double): CompositeTrajectory2D =
-        all(start, end, turningRadius).minBy { it.length }
-
-    public fun rlr(start: DubinsPose2D, end: DubinsPose2D, turningRadius: Double): CompositeTrajectory2D? =
-        with(Euclidean2DSpace) {
-            val c1 = start.getRightCircle(turningRadius)
-            val c2 = end.getRightCircle(turningRadius)
-            val centers = StraightTrajectory2D(c1.center, c2.center)
-            if (centers.length > turningRadius * 4) return null
-
-            val firstVariant = run {
-                var theta = (centers.bearing - acos(centers.length / (turningRadius * 4)).radians).normalized()
-                var dX = turningRadius * sin(theta)
-                var dY = turningRadius * cos(theta)
-                val p = vector(c1.center.x + dX * 2, c1.center.y + dY * 2)
-                val e = Circle2D(p, turningRadius)
-                val p1 = vector(c1.center.x + dX, c1.center.y + dY)
-                theta = (centers.bearing + acos(centers.length / (turningRadius * 4)).radians).normalized()
-                dX = turningRadius * sin(theta)
-                dY = turningRadius * cos(theta)
-                val p2 = vector(e.center.x + dX, e.center.y + dY)
-                val a1 = CircleTrajectory2D.of(c1.center, start, p1, CircleTrajectory2D.Direction.RIGHT)
-                val a2 = CircleTrajectory2D.of(e.center, p1, p2, CircleTrajectory2D.Direction.LEFT)
-                val a3 = CircleTrajectory2D.of(c2.center, p2, end, CircleTrajectory2D.Direction.RIGHT)
-                CompositeTrajectory2D(a1, a2, a3)
-            }
-
-            val secondVariant = run {
-                var theta = (centers.bearing + acos(centers.length / (turningRadius * 4)).radians).normalized()
-                var dX = turningRadius * sin(theta)
-                var dY = turningRadius * cos(theta)
-                val p = vector(c1.center.x + dX * 2, c1.center.y + dY * 2)
-                val e = Circle2D(p, turningRadius)
-                val p1 = vector(c1.center.x + dX, c1.center.y + dY)
-                theta = (centers.bearing - acos(centers.length / (turningRadius * 4)).radians).normalized()
-                dX = turningRadius * sin(theta)
-                dY = turningRadius * cos(theta)
-                val p2 = vector(e.center.x + dX, e.center.y + dY)
-                val a1 = CircleTrajectory2D.of(c1.center, start, p1, CircleTrajectory2D.Direction.RIGHT)
-                val a2 = CircleTrajectory2D.of(e.center, p1, p2, CircleTrajectory2D.Direction.LEFT)
-                val a3 = CircleTrajectory2D.of(c2.center, p2, end, CircleTrajectory2D.Direction.RIGHT)
-                CompositeTrajectory2D(a1, a2, a3)
-            }
-
-            return if (firstVariant.length < secondVariant.length) firstVariant else secondVariant
-        }
-
-    public fun lrl(start: DubinsPose2D, end: DubinsPose2D, turningRadius: Double): CompositeTrajectory2D? =
-        with(Euclidean2DSpace) {
-            val c1 = start.getLeftCircle(turningRadius)
-            val c2 = end.getLeftCircle(turningRadius)
-            val centers = StraightTrajectory2D(c1.center, c2.center)
-            if (centers.length > turningRadius * 4) return null
-
-            val firstVariant = run {
-                var theta = (centers.bearing + acos(centers.length / (turningRadius * 4)).radians).normalized()
-                var dX = turningRadius * sin(theta)
-                var dY = turningRadius * cos(theta)
-                val p = vector(c1.center.x + dX * 2, c1.center.y + dY * 2)
-                val e = Circle2D(p, turningRadius)
-                val p1 = vector(c1.center.x + dX, c1.center.y + dY)
-                theta = (centers.bearing - acos(centers.length / (turningRadius * 4)).radians).normalized()
-                dX = turningRadius * sin(theta)
-                dY = turningRadius * cos(theta)
-                val p2 = vector(e.center.x + dX, e.center.y + dY)
-                val a1 = CircleTrajectory2D.of(c1.center, start, p1, CircleTrajectory2D.Direction.LEFT)
-                val a2 = CircleTrajectory2D.of(e.center, p1, p2, CircleTrajectory2D.Direction.RIGHT)
-                val a3 = CircleTrajectory2D.of(c2.center, p2, end, CircleTrajectory2D.Direction.LEFT)
-                CompositeTrajectory2D(a1, a2, a3)
-            }
-
-            val secondVariant = run {
-                var theta = (centers.bearing - acos(centers.length / (turningRadius * 4)).radians).normalized()
-                var dX = turningRadius * sin(theta)
-                var dY = turningRadius * cos(theta)
-                val p = vector(c1.center.x + dX * 2, c1.center.y + dY * 2)
-                val e = Circle2D(p, turningRadius)
-                val p1 = vector(c1.center.x + dX, c1.center.y + dY)
-                theta = (centers.bearing + acos(centers.length / (turningRadius * 4)).radians).normalized()
-                dX = turningRadius * sin(theta)
-                dY = turningRadius * cos(theta)
-                val p2 = vector(e.center.x + dX, e.center.y + dY)
-                val a1 = CircleTrajectory2D.of(c1.center, start, p1, CircleTrajectory2D.Direction.LEFT)
-                val a2 = CircleTrajectory2D.of(e.center, p1, p2, CircleTrajectory2D.Direction.RIGHT)
-                val a3 = CircleTrajectory2D.of(c2.center, p2, end, CircleTrajectory2D.Direction.LEFT)
-                CompositeTrajectory2D(a1, a2, a3)
-            }
-
-            return if (firstVariant.length < secondVariant.length) firstVariant else secondVariant
-        }
-
-    public fun rsr(start: DubinsPose2D, end: DubinsPose2D, turningRadius: Double): CompositeTrajectory2D {
-        val c1 = start.getRightCircle(turningRadius)
-        val c2 = end.getRightCircle(turningRadius)
-        val s = leftOuterTangent(c1, c2)
-        val a1 = CircleTrajectory2D.of(c1.center, start, s.start, CircleTrajectory2D.Direction.RIGHT)
-        val a3 = CircleTrajectory2D.of(c2.center, s.end, end, CircleTrajectory2D.Direction.RIGHT)
-        return CompositeTrajectory2D(a1, s, a3)
-    }
-
-    public fun lsl(start: DubinsPose2D, end: DubinsPose2D, turningRadius: Double): CompositeTrajectory2D {
-        val c1 = start.getLeftCircle(turningRadius)
-        val c2 = end.getLeftCircle(turningRadius)
-        val s = rightOuterTangent(c1, c2)
-        val a1 = CircleTrajectory2D.of(c1.center, start, s.start, CircleTrajectory2D.Direction.LEFT)
-        val a3 = CircleTrajectory2D.of(c2.center, s.end, end, CircleTrajectory2D.Direction.LEFT)
-        return CompositeTrajectory2D(a1, s, a3)
-    }
-
-    public fun rsl(start: DubinsPose2D, end: DubinsPose2D, turningRadius: Double): CompositeTrajectory2D? {
-        val c1 = start.getRightCircle(turningRadius)
-        val c2 = end.getLeftCircle(turningRadius)
-        val s = rightInnerTangent(c1, c2)
-        if (s == null || c1.center.distanceTo(c2.center) < turningRadius * 2) return null
-
-        val a1 = CircleTrajectory2D.of(c1.center, start, s.start, CircleTrajectory2D.Direction.RIGHT)
-        val a3 = CircleTrajectory2D.of(c2.center, s.end, end, CircleTrajectory2D.Direction.LEFT)
-        return CompositeTrajectory2D(a1, s, a3)
-    }
-
-    public fun lsr(start: DubinsPose2D, end: DubinsPose2D, turningRadius: Double): CompositeTrajectory2D? {
-        val c1 = start.getLeftCircle(turningRadius)
-        val c2 = end.getRightCircle(turningRadius)
-        val s = leftInnerTangent(c1, c2)
-        if (s == null || c1.center.distanceTo(c2.center) < turningRadius * 2) return null
-
-        val a1 = CircleTrajectory2D.of(c1.center, start, s.start, CircleTrajectory2D.Direction.LEFT)
-        val a3 = CircleTrajectory2D.of(c2.center, s.end, end, CircleTrajectory2D.Direction.RIGHT)
-        return CompositeTrajectory2D(a1, s, a3)
-    }
-}
-
-public fun interface MaxCurvature {
-    public fun compute(startPoint: PhaseVector2D): Double
-}
-
-public fun DubinsPath.shortest(
-    start: PhaseVector2D,
-    end: PhaseVector2D,
-    maxCurvature: MaxCurvature,
-): CompositeTrajectory2D = shortest(start, end, maxCurvature.compute(start))
-

kmath-trajectory/src/commonMain/kotlin/space/kscience/kmath/trajectory/DubinsPose2D.kt

@@ -1,61 +0,0 @@
-/*
- * Copyright 2018-2022 KMath contributors.
- * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
- */
-@file:UseSerializers(Euclidean2DSpace.VectorSerializer::class)
-package space.kscience.kmath.trajectory
-
-import kotlinx.serialization.KSerializer
-import kotlinx.serialization.SerialName
-import kotlinx.serialization.Serializable
-import kotlinx.serialization.UseSerializers
-import kotlinx.serialization.descriptors.SerialDescriptor
-import kotlinx.serialization.encoding.Decoder
-import kotlinx.serialization.encoding.Encoder
-import space.kscience.kmath.geometry.*
-import kotlin.math.atan2
-
-/**
- * Combination of [Vector] and its view angle (clockwise from positive y-axis direction)
- */
-@Serializable(DubinsPose2DSerializer::class)
-public interface DubinsPose2D : DoubleVector2D {
-    public val coordinates: DoubleVector2D
-    public val bearing: Angle
-}
-
-@Serializable
-public class PhaseVector2D(
-    override val coordinates: DoubleVector2D,
-    public val velocity: DoubleVector2D,
-) : DubinsPose2D, DoubleVector2D by coordinates {
-    override val bearing: Angle get() = atan2(velocity.x, velocity.y).radians
-}
-
-@Serializable
-@SerialName("DubinsPose2D")
-private class DubinsPose2DImpl(
-    override val coordinates: DoubleVector2D,
-    override val bearing: Angle,
-) : DubinsPose2D, DoubleVector2D by coordinates{
-
-    override fun toString(): String = "DubinsPose2D(x=$x, y=$y, bearing=$bearing)"
-}
-
-public object DubinsPose2DSerializer: KSerializer<DubinsPose2D>{
-    private val proxySerializer = DubinsPose2DImpl.serializer()
-
-    override val descriptor: SerialDescriptor
-        get() = proxySerializer.descriptor
-
-    override fun deserialize(decoder: Decoder): DubinsPose2D {
-        return decoder.decodeSerializableValue(proxySerializer)
-    }
-
-    override fun serialize(encoder: Encoder, value: DubinsPose2D) {
-        val pose = value as? DubinsPose2DImpl ?: DubinsPose2DImpl(value.coordinates, value.bearing)
-        encoder.encodeSerializableValue(proxySerializer, pose)
-    }
-}
-
-public fun DubinsPose2D(coordinate: DoubleVector2D, theta: Angle): DubinsPose2D = DubinsPose2DImpl(coordinate, theta)

kmath-trajectory/src/commonMain/kotlin/space/kscience/kmath/trajectory/Trajectory2D.kt

@@ -1,117 +0,0 @@
-/*
- * Copyright 2018-2022 KMath contributors.
- * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
- */
-@file:UseSerializers(Euclidean2DSpace.VectorSerializer::class)
-
-package space.kscience.kmath.trajectory
-
-import kotlinx.serialization.SerialName
-import kotlinx.serialization.Serializable
-import kotlinx.serialization.UseSerializers
-import space.kscience.kmath.geometry.*
-import space.kscience.kmath.geometry.Euclidean2DSpace.distanceTo
-import kotlin.math.atan2
-
-@Serializable
-public sealed interface Trajectory2D {
-    public val length: Double
-}
-
-/**
- * Straight path segment. The order of start and end defines the direction
- */
-@Serializable
-@SerialName("straight")
-public data class StraightTrajectory2D(
-    public val start: DoubleVector2D,
-    public val end: DoubleVector2D,
-) : Trajectory2D {
-    override val length: Double get() = start.distanceTo(end)
-
-    public val bearing: Angle get() = (atan2(end.x - start.x, end.y - start.y).radians).normalized()
-}
-
-/**
- * An arc segment
- */
-@Serializable
-@SerialName("arc")
-public data class CircleTrajectory2D(
-    public val circle: Circle2D,
-    public val start: DubinsPose2D,
-    public val end: DubinsPose2D,
-) : Trajectory2D {
-
-    public enum class Direction {
-        LEFT, RIGHT
-    }
-
-    /**
-     * Arc length in radians
-     */
-    val arcLength: Angle
-        get() = if (direction == Direction.LEFT) {
-            start.bearing - end.bearing
-        } else {
-            end.bearing - start.bearing
-        }.normalized()
-
-
-    override val length: Double by lazy {
-        circle.radius * arcLength.radians
-    }
-
-    public val direction: Direction by lazy {
-        if (start.y < circle.center.y) {
-            if (start.bearing > Angle.pi) Direction.RIGHT else Direction.LEFT
-        } else if (start.y > circle.center.y) {
-            if (start.bearing < Angle.pi) Direction.RIGHT else Direction.LEFT
-        } else {
-            if (start.bearing == Angle.zero) {
-                if (start.x < circle.center.x) Direction.RIGHT else Direction.LEFT
-            } else {
-                if (start.x > circle.center.x) Direction.RIGHT else Direction.LEFT
-            }
-        }
-    }
-
-    public companion object {
-        public fun of(
-            center: DoubleVector2D,
-            start: DoubleVector2D,
-            end: DoubleVector2D,
-            direction: Direction,
-        ): CircleTrajectory2D {
-            fun calculatePose(
-                vector: DoubleVector2D,
-                theta: Angle,
-                direction: Direction,
-            ): DubinsPose2D = DubinsPose2D(
-                vector,
-                when (direction) {
-                    Direction.LEFT -> (theta - Angle.piDiv2).normalized()
-                    Direction.RIGHT -> (theta + Angle.piDiv2).normalized()
-                }
-            )
-
-            val s1 = StraightTrajectory2D(center, start)
-            val s2 = StraightTrajectory2D(center, end)
-            val pose1 = calculatePose(start, s1.bearing, direction)
-            val pose2 = calculatePose(end, s2.bearing, direction)
-            val trajectory = CircleTrajectory2D(Circle2D(center, s1.length), pose1, pose2)
-            if (trajectory.direction != direction) error("Trajectory direction mismatch")
-            return trajectory
-        }
-    }
-}
-
-@Serializable
-@SerialName("composite")
-public class CompositeTrajectory2D(public val segments: List<Trajectory2D>) : Trajectory2D {
-    override val length: Double get() = segments.sumOf { it.length }
-}
-
-public fun CompositeTrajectory2D(vararg segments: Trajectory2D): CompositeTrajectory2D =
-    CompositeTrajectory2D(segments.toList())
-

kmath-trajectory/src/commonMain/kotlin/space/kscience/kmath/trajectory/tangent.kt

@@ -1,60 +0,0 @@
-/*
- * Copyright 2018-2023 KMath contributors.
- * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
- */
-
-package space.kscience.kmath.trajectory
-
-import space.kscience.kmath.geometry.*
-import kotlin.math.*
-
-/**
- * Create inner and outer tangents between two circles.
- * This method returns a map of segments using [DubinsPath] connection type notation.
- */
-public fun Circle2D.tangentsToCircle(
-    other: Circle2D,
-): Map<DubinsPath.Type, LineSegment<DoubleVector2D>> = with(Euclidean2DSpace) {
-    //return empty map for concentric circles
-    if(center.equalsVector(other.center)) return@tangentsToCircle emptyMap()
-
-    // A line connecting centers
-    val line = LineSegment(center, other.center)
-    // Distance between centers
-    val distance = line.begin.distanceTo(line.end)
-    val angle1 = atan2(other.center.x - center.x, other.center.y - center.y)
-    var angle2: Double
-    val routes = mapOf(
-        DubinsPath.Type.RSR to Pair(radius, other.radius),
-        DubinsPath.Type.RSL to Pair(radius, -other.radius),
-        DubinsPath.Type.LSR to Pair(-radius, other.radius),
-        DubinsPath.Type.LSL to Pair(-radius, -other.radius)
-    )
-    return buildMap {
-        for ((route, r1r2) in routes) {
-            val r1 = r1r2.first
-            val r2 = r1r2.second
-            val r = if (r1.sign == r2.sign) {
-                r1.absoluteValue - r2.absoluteValue
-            } else {
-                r1.absoluteValue + r2.absoluteValue
-            }
-            if (distance <= r) TODO("Intersecting circles are not supported yet")
-            val l = sqrt(distance * distance - r * r)
-            angle2 = if (r1.absoluteValue > r2.absoluteValue) {
-                angle1 + r1.sign * atan2(r.absoluteValue, l)
-            } else {
-                angle1 - r2.sign * atan2(r.absoluteValue, l)
-            }
-            val w = vector(-cos(angle2), sin(angle2))
-            put(
-                route,
-                LineSegment(
-                    center + w * r1,
-                    other.center + w * r2
-                )
-            )
-
-        }
-    }
-}

kmath-trajectory/src/commonTest/kotlin/space/kscience/kmath/trajectory/TangentTest.kt

@@ -1,77 +0,0 @@
-/*
- * Copyright 2018-2023 KMath contributors.
- * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
- */
-
-package space.kscience.kmath.trajectory
-
-import space.kscience.kmath.geometry.Circle2D
-import space.kscience.kmath.geometry.Euclidean2DSpace
-import space.kscience.kmath.geometry.Euclidean2DSpace.vector
-import space.kscience.kmath.geometry.LineSegment
-import space.kscience.kmath.geometry.equalsLine
-import kotlin.test.Test
-import kotlin.test.assertEquals
-import kotlin.test.assertTrue
-
-class TangentTest {
-    @Test
-    fun tangents() {
-        val c1 = Circle2D(vector(0.0, 0.0), 1.0)
-        val c2 = Circle2D(vector(4.0, 0.0), 1.0)
-        val routes = listOf(
-            DubinsPath.Type.RSR,
-            DubinsPath.Type.RSL,
-            DubinsPath.Type.LSR,
-            DubinsPath.Type.LSL
-        )
-        val segments = listOf(
-            LineSegment(
-                begin = vector(0.0, 1.0),
-                end = vector(4.0, 1.0)
-            ),
-            LineSegment(
-                begin = vector(0.5, 0.8660254),
-                end = vector(3.5, -0.8660254)
-            ),
-            LineSegment(
-                begin = vector(0.5, -0.8660254),
-                end = vector(3.5, 0.8660254)
-            ),
-            LineSegment(
-                begin = vector(0.0, -1.0),
-                end = vector(4.0, -1.0)
-            )
-        )
-
-        val tangentMap = c1.tangentsToCircle(c2)
-        val tangentMapKeys = tangentMap.keys.toList()
-        val tangentMapValues = tangentMap.values.toList()
-
-        assertEquals(routes, tangentMapKeys)
-        for (i in segments.indices) {
-            assertTrue(segments[i].equalsLine(Euclidean2DSpace, tangentMapValues[i]))
-        }
-    }
-
-    @Test
-    fun concentric(){
-        val c1 = Circle2D(vector(0.0, 0.0), 10.0)
-        val c2 = Circle2D(vector(0.0, 0.0), 1.0)
-        assertEquals(emptyMap(), c1.tangentsToCircle(c2))
-    }
-//
-//    @Test
-//    fun nonExistingTangents() {
-//        assertFailsWith<NotImplementedError> {
-//            val c1 = Circle2D(vector(0.0, 0.0), 1.0)
-//            val c2 = Circle2D(vector(2.0, 0.0), 1.0)
-//            c1.tangentsToCircle(c2)
-//        }
-//        assertFailsWith<NotImplementedError> {
-//            val c1 = Circle2D(vector(0.0, 0.0), 1.0)
-//            val c2 = Circle2D(vector(0.5, 0.0), 1.0)
-//            c1.tangentsToCircle(c2)
-//        }
-//    }
-}

kmath-trajectory/src/commonTest/kotlin/space/kscience/kmath/trajectory/dubins/DubinsTests.kt

@@ -1,62 +0,0 @@
-/*
- * Copyright 2018-2022 KMath contributors.
- * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
- */
-
-package space.kscience.kmath.trajectory.dubins
-
-import space.kscience.kmath.geometry.Euclidean2DSpace
-import space.kscience.kmath.geometry.equalsFloat
-import space.kscience.kmath.trajectory.*
-import kotlin.test.Test
-import kotlin.test.assertNotNull
-import kotlin.test.assertTrue
-
-
-class DubinsTests {
-
-    @Test
-    fun dubinsTest() = with(Euclidean2DSpace){
-        val straight = StraightTrajectory2D(vector(0.0, 0.0), vector(100.0, 100.0))
-        val lineP1 = straight.shift(1, 10.0).inverse()
-
-        val start = DubinsPose2D(straight.end, straight.bearing)
-        val end = DubinsPose2D(lineP1.start, lineP1.bearing)
-        val radius = 2.0
-        val dubins = DubinsPath.all(start, end, radius)
-
-        val absoluteDistance = start.distanceTo(end)
-        println("Absolute distance: $absoluteDistance")
-
-        val expectedLengths = mapOf(
-            DubinsPath.Type.RLR to 13.067681939031397,
-            DubinsPath.Type.RSR to 12.28318530717957,
-            DubinsPath.Type.LSL to 32.84955592153878,
-            DubinsPath.Type.RSL to 23.37758938854081,
-            DubinsPath.Type.LSR to 23.37758938854081
-        )
-
-        expectedLengths.forEach {
-            val path = dubins.find { p -> DubinsPath.trajectoryTypeOf(p) === it.key }
-            assertNotNull(path, "Path ${it.key} not found")
-            println("${it.key}: ${path.length}")
-            assertTrue(it.value.equalsFloat(path.length))
-
-            val a = path.segments[0] as CircleTrajectory2D
-            val b = path.segments[1]
-            val c = path.segments[2] as CircleTrajectory2D
-
-            assertTrue(start.equalsFloat(a.start))
-            assertTrue(end.equalsFloat(c.end))
-
-            // Not working, theta double precision inaccuracy
-            if (b is CircleTrajectory2D) {
-                assertTrue(a.end.equalsFloat(b.start))
-                assertTrue(c.start.equalsFloat(b.end))
-            } else if (b is StraightTrajectory2D) {
-                assertTrue(a.end.equalsFloat(DubinsPose2D(b.start, b.bearing)))
-                assertTrue(c.start.equalsFloat(DubinsPose2D(b.end, b.bearing)))
-            }
-        }
-    }
-}

kmath-trajectory/src/commonTest/kotlin/space/kscience/kmath/trajectory/math.kt

@@ -1,27 +0,0 @@
-/*
- * Copyright 2018-2022 KMath contributors.
- * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
- */
-
-package space.kscience.kmath.trajectory
-
-import space.kscience.kmath.geometry.Euclidean2DSpace
-import space.kscience.kmath.geometry.equalsFloat
-import space.kscience.kmath.geometry.radians
-import space.kscience.kmath.geometry.sin
-
-
-fun DubinsPose2D.equalsFloat(other: DubinsPose2D) =
-    x.equalsFloat(other.x) && y.equalsFloat(other.y) && bearing.radians.equalsFloat(other.bearing.radians)
-
-fun StraightTrajectory2D.inverse() = StraightTrajectory2D(end, start)
-
-fun StraightTrajectory2D.shift(shift: Int, width: Double): StraightTrajectory2D = with(Euclidean2DSpace) {
-    val dX = width * sin(inverse().bearing)
-    val dY = width * sin(bearing)
-
-    return StraightTrajectory2D(
-        vector(start.x - dX * shift, start.y - dY * shift),
-        vector(end.x - dX * shift, end.y - dY * shift)
-    )
-}

kmath-trajectory/src/commonTest/kotlin/space/kscience/kmath/trajectory/segments/ArcTests.kt

@@ -1,31 +0,0 @@
-/*
- * Copyright 2018-2022 KMath contributors.
- * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
- */
-
-package space.kscience.kmath.trajectory.segments
-
-import space.kscience.kmath.geometry.Circle2D
-import space.kscience.kmath.geometry.Euclidean2DSpace
-import space.kscience.kmath.geometry.circumference
-import space.kscience.kmath.geometry.degrees
-import space.kscience.kmath.trajectory.CircleTrajectory2D
-import kotlin.test.Test
-import kotlin.test.assertEquals
-
-class ArcTests {
-
-    @Test
-    fun arcTest() = with(Euclidean2DSpace){
-        val circle = Circle2D(vector(0.0, 0.0), 2.0)
-        val arc = CircleTrajectory2D.of(
-            circle.center,
-            vector(-2.0, 0.0),
-            vector(0.0, 2.0),
-            CircleTrajectory2D.Direction.RIGHT
-        )
-        assertEquals(circle.circumference / 4, arc.length, 1.0)
-        assertEquals(0.0, arc.start.bearing.degrees)
-        assertEquals(90.0, arc.end.bearing.degrees)
-    }
-}

kmath-trajectory/src/commonTest/kotlin/space/kscience/kmath/trajectory/segments/CircleTests.kt

@@ -1,24 +0,0 @@
-/*
- * Copyright 2018-2022 KMath contributors.
- * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
- */
-
-package space.kscience.kmath.trajectory.segments
-
-import space.kscience.kmath.geometry.Circle2D
-import space.kscience.kmath.geometry.Euclidean2DSpace
-import space.kscience.kmath.geometry.circumference
-import kotlin.test.Test
-import kotlin.test.assertEquals
-
-class CircleTests {
-
-    @Test
-    fun arcTest() {
-        val center = Euclidean2DSpace.vector(0.0, 0.0)
-        val radius = 2.0
-        val expectedCircumference = 12.56637
-        val circle = Circle2D(center, radius)
-        assertEquals(expectedCircumference, circle.circumference, 1e-4)
-    }
-}

kmath-trajectory/src/commonTest/kotlin/space/kscience/kmath/trajectory/segments/LineTests.kt

@@ -1,37 +0,0 @@
-/*
- * Copyright 2018-2022 KMath contributors.
- * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
- */
-
-package space.kscience.kmath.trajectory.segments
-
-import space.kscience.kmath.geometry.Euclidean2DSpace
-import space.kscience.kmath.geometry.degrees
-import space.kscience.kmath.trajectory.StraightTrajectory2D
-import kotlin.math.pow
-import kotlin.math.sqrt
-import kotlin.test.Test
-import kotlin.test.assertEquals
-
-class LineTests {
-
-    @Test
-    fun lineTest() = with(Euclidean2DSpace){
-        val straight = StraightTrajectory2D(vector(0.0, 0.0), vector(100.0, 100.0))
-        assertEquals(sqrt(100.0.pow(2) + 100.0.pow(2)), straight.length)
-        assertEquals(45.0, straight.bearing.degrees)
-    }
-
-    @Test
-    fun lineAngleTest() = with(Euclidean2DSpace){
-        //val zero = Vector2D(0.0, 0.0)
-        val north = StraightTrajectory2D(zero, vector(0.0, 2.0))
-        assertEquals(0.0, north.bearing.degrees)
-        val east = StraightTrajectory2D(zero, vector(2.0, 0.0))
-        assertEquals(90.0, east.bearing.degrees)
-        val south = StraightTrajectory2D(zero, vector(0.0, -2.0))
-        assertEquals(180.0, south.bearing.degrees)
-        val west = StraightTrajectory2D(zero, vector(-2.0, 0.0))
-        assertEquals(270.0, west.bearing.degrees)
-    }
-}

settings.gradle.kts

@@ -44,7 +44,6 @@ include(
     ":kmath-jupyter",
     ":kmath-symja",
     ":kmath-jafama",
-    ":kmath-trajectory",
     ":examples",
     ":benchmarks",
 )