kmath-core/src/commonMain/kotlin/space/kscience/kmath/expressions/MstAlgebra.kt

@@ -167,9 +167,9 @@ public object MstLogicAlgebra : LogicAlgebra<MST> {
     override fun bindSymbolOrNull(value: String): MST = super.bindSymbolOrNull(value) ?: StringSymbol(value)
 
     override fun const(boolean: Boolean): Symbol = if (boolean) {
-        LogicAlgebra.TRUE
+        BinaryLogic.TRUE
     } else {
-        LogicAlgebra.FALSE
+        BinaryLogic.FALSE
     }
 
     override fun MST.not(): MST = MST.Unary(Boolean::not.name, this)

kmath-core/src/commonMain/kotlin/space/kscience/kmath/operations/BinaryLogic.kt

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2018-2021 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.operations
+
+import space.kscience.kmath.expressions.Symbol
+import space.kscience.kmath.expressions.symbol
+
+ interface BinaryLogic<T : Any> {
+    /**
+     * Logic 'not'
+     */
+    public operator fun T.not(): T
+
+    /**
+     * Logic 'and'
+     */
+    public infix fun T.and(other: T): T
+
+    /**
+     * Logic 'or'
+     */
+    public infix fun T.or(other: T): T
+
+    /**
+     * Logic 'xor'
+     */
+    public infix fun T.xor(other: T): T
+
+    companion object {
+        public val TRUE: Symbol by symbol
+        public val FALSE: Symbol by symbol
+    }
+}

kmath-core/src/commonMain/kotlin/space/kscience/kmath/operations/LogicAlgebra.kt

@@ -5,16 +5,13 @@
 
 package space.kscience.kmath.operations
 
-import space.kscience.kmath.expressions.Symbol
-import space.kscience.kmath.expressions.symbol
 import space.kscience.kmath.misc.UnstableKMathAPI
 
 /**
  * An algebra for generic boolean logic
  */
 @UnstableKMathAPI
-public interface LogicAlgebra<T : Any> : Algebra<T> {
+public interface LogicAlgebra<T : Any> : Algebra<T>, BinaryLogic<T> {
-
     /**
      * Represent constant [Boolean] as [T]
      */
@@ -38,32 +35,6 @@ public interface LogicAlgebra<T : Any> : Algebra<T> {
     override fun binaryOperationFunction(operation: String): (left: T, right: T) -> T = { l, r ->
         binaryOperation(operation, l, r)
     }
-
-    /**
-     * Logic 'not'
-     */
-    public operator fun T.not(): T
-
-    /**
-     * Logic 'and'
-     */
-    public infix fun T.and(other: T): T
-
-    /**
-     * Logic 'or'
-     */
-    public infix fun T.or(other: T): T
-
-    /**
-     * Logic 'xor'
-     */
-    public infix fun T.xor(other: T): T
-
-
-    public companion object {
-        public val TRUE: Symbol by symbol
-        public val FALSE: Symbol by symbol
-    }
 }
 
 /**

kmath-core/src/commonMain/kotlin/space/kscience/kmath/structures/DoubleBuffer.kt

@@ -6,6 +6,7 @@
 package space.kscience.kmath.structures
 
 import kotlin.jvm.JvmInline
+import kotlin.random.Random.Default.nextDouble
 
 /**
  * Specialized [MutableBuffer] implementation over [DoubleArray].
@@ -42,6 +43,11 @@ public value class DoubleBuffer(public val array: DoubleArray) : MutableBuffer<D
  */
 public inline fun DoubleBuffer(size: Int, init: (Int) -> Double): DoubleBuffer = DoubleBuffer(DoubleArray(size) { init(it) })
 
+/**
+ * A chunk of doubles of given [size].
+ */
+public fun nextDoubleBuffer(size: Int): DoubleBuffer = DoubleBuffer(size) { nextDouble() }
+
 /**
  * Returns a new [DoubleBuffer] of given elements.
  */

kmath-histograms/src/commonTest/kotlin/space/kscience/kmath/histogram/UniformHistogram1DTest.kt

@@ -12,6 +12,7 @@ import space.kscience.kmath.misc.UnstableKMathAPI
 import space.kscience.kmath.operations.DoubleField
 import space.kscience.kmath.stat.RandomGenerator
 import space.kscience.kmath.stat.nextBuffer
+import space.kscience.kmath.structures.nextDoubleBuffer
 import kotlin.native.concurrent.ThreadLocal
 import kotlin.test.Test
 import kotlin.test.assertEquals
@@ -35,7 +36,7 @@ internal class UniformHistogram1DTest {
 
     @Test
     fun rebinDown() = runTest {
-        val h1 = Histogram.uniform1D(DoubleField, 0.01).produce(generator.nextDoubleBuffer(10000))
+        val h1 = Histogram.uniform1D(DoubleField, 0.01).produce(nextDoubleBuffer(10000))
         val h2 = Histogram.uniform1D(DoubleField,0.03).produceFrom(h1)
 
         assertEquals(10000, h2.bins.sumOf { it.binValue }.toInt())
@@ -43,7 +44,7 @@ internal class UniformHistogram1DTest {
 
     @Test
     fun rebinUp() = runTest {
-        val h1 = Histogram.uniform1D(DoubleField, 0.03).produce(generator.nextDoubleBuffer(10000))
+        val h1 = Histogram.uniform1D(DoubleField, 0.03).produce(nextDoubleBuffer(10000))
         val h2 = Histogram.uniform1D(DoubleField,0.01).produceFrom(h1)
 
         assertEquals(10000, h2.bins.sumOf { it.binValue }.toInt())

kmath-nd4j/src/main/kotlin/space/kscience/kmath/nd4j/arrays.kt

@@ -8,3 +8,13 @@ package space.kscience.kmath.nd4j
 import space.kscience.kmath.misc.toIntExact
 
 internal fun LongArray.toIntArray(): IntArray = IntArray(size) { this[it].toIntExact() }
+
+internal fun LongArray.linspace(start: Long, stop: Long) = Array(this.size) {
+    start + it * ((stop - start) / (this.size - 1))
+}
+
+internal fun LongArray.zeros() = Array(this.size) { 0 }
+
+internal fun LongArray.ones() = Array(this.size) { 1 }
+
+internal fun repeat(number: Long, size: Int) = LongArray(size) { number }

kmath-nd4j/src/test/kotlin/space/kscience/kmath/nd4j/ArraysTest.kt

@@ -0,0 +1,43 @@
+/*
+ * Copyright 2018-2021 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.nd4j
+
+import org.junit.jupiter.api.Test
+import kotlin.test.assertEquals
+
+class ArraysTest {
+    @Test
+    fun checkLinspaceBuilder() {
+        val array = LongArray(3).linspace(15, 22)
+        assertEquals(array[0],  15)
+        assertEquals(array[1], 18)
+        assertEquals(array[2], 21)
+    }
+
+    @Test
+    fun checkZerosBuilder() {
+        val array = LongArray(3).zeros()
+        assertEquals(array[0], 0)
+        assertEquals(array[1], 0)
+        assertEquals(array[2], 0)
+    }
+
+    @Test
+    fun checkOnesBuilder() {
+        val array = LongArray(3).ones()
+        assertEquals(array[0], 1)
+        assertEquals(array[1], 1)
+        assertEquals(array[2], 1)
+    }
+
+    @Test
+    fun checkRepeatBuilder() {
+        val array = repeat(5, 3)
+        assertEquals(array[0], 5)
+        assertEquals(array[1], 5)
+        assertEquals(array[2], 5)
+    }
+}

kmath-stat/src/commonMain/kotlin/space/kscience/kmath/samplers/BoxMullerSampler.kt

@@ -8,6 +8,7 @@ package space.kscience.kmath.samplers
 import space.kscience.kmath.chains.BlockingDoubleChain
 import space.kscience.kmath.stat.RandomGenerator
 import space.kscience.kmath.structures.DoubleBuffer
+import space.kscience.kmath.structures.nextDoubleBuffer
 import kotlin.math.*
 
 /**
@@ -23,8 +24,8 @@ public object BoxMullerSampler : NormalizedGaussianSampler {
         var state = Double.NaN
 
         override fun nextBufferBlocking(size: Int): DoubleBuffer {
-            val xs = generator.nextDoubleBuffer(size)
+            val xs = nextDoubleBuffer(size)
-            val ys = generator.nextDoubleBuffer(size)
+            val ys = nextDoubleBuffer(size)
 
             return DoubleBuffer(size) { index ->
                 if (state.isNaN()) {

kmath-stat/src/commonMain/kotlin/space/kscience/kmath/stat/RandomChain.kt

@@ -8,6 +8,7 @@ package space.kscience.kmath.stat
 import space.kscience.kmath.chains.BlockingDoubleChain
 import space.kscience.kmath.chains.Chain
 import space.kscience.kmath.structures.DoubleBuffer
+import space.kscience.kmath.structures.nextDoubleBuffer
 
 /**
  * A possibly stateful chain producing random values.
@@ -31,7 +32,7 @@ public fun <R> RandomGenerator.chain(generator: suspend RandomGenerator.() -> R)
  * A type-specific double chunk random chain
  */
 public class UniformDoubleChain(public val generator: RandomGenerator) : BlockingDoubleChain {
-    override fun nextBufferBlocking(size: Int): DoubleBuffer = generator.nextDoubleBuffer(size)
+    override fun nextBufferBlocking(size: Int): DoubleBuffer = nextDoubleBuffer(size)
     override suspend fun nextBuffer(size: Int): DoubleBuffer = nextBufferBlocking(size)
 
     override suspend fun fork(): UniformDoubleChain = UniformDoubleChain(generator.fork())

kmath-stat/src/commonMain/kotlin/space/kscience/kmath/stat/RandomGenerator.kt

@@ -22,11 +22,6 @@ public interface RandomGenerator {
      */
     public fun nextDouble(): Double
 
-    /**
-     * A chunk of doubles of given [size].
-     */
-    public fun nextDoubleBuffer(size: Int): DoubleBuffer = DoubleBuffer(size) { nextDouble() }
-
     /**
      * Gets the next random `Int` from the random number generator.
      *

kmath-tensorflow/src/main/kotlin/space/kscience/kmath/tensorflow/tfOperations.kt

@@ -21,3 +21,11 @@ public fun <T, TT : TNumber, A> TensorFlowAlgebra<T, TT, A>.sin(
 public fun <T, TT : TNumber, A> TensorFlowAlgebra<T, TT, A>.cos(
     arg: StructureND<T>,
 ): TensorFlowOutput<T, TT> where A : TrigonometricOperations<T>, A : Ring<T> = arg.operate { ops.math.cos(it) }
+
+public fun <T, TT : TNumber, A> TensorFlowAlgebra<T, TT, A>.tan(
+    arg: StructureND<T>,
+): TensorFlowOutput<T, TT> where A : TrigonometricOperations<T>, A : Ring<T> = arg.operate { ops.math.tan(it) }
+
+public fun <T, TT : TNumber, A> TensorFlowAlgebra<T, TT, A>.abs(
+    arg: StructureND<T>,
+): TensorFlowOutput<T, TT> where A : TrigonometricOperations<T>, A : Ring<T> = arg.operate { ops.math.abs(it) }