Optimize RealMatrix dot operation

examples/src/main/kotlin/kscience/kmath/structures/NDField.kt

@@ -45,14 +45,14 @@ fun main() {
     measureAndPrint("Specialized addition") {
         specializedField {
             var res: NDBuffer<Double> = one
-            repeat(n) { res += 1.0 }
+            repeat(n) { res += one }
         }
     }
 
     measureAndPrint("Nd4j specialized addition") {
         nd4jField {
             var res = one
-            repeat(n) { res += 1.0 as Number }
+            repeat(n) { res += one }
         }
     }
 

kmath-core/src/commonMain/kotlin/kscience/kmath/linear/RealMatrixContext.kt

@@ -61,7 +61,7 @@ public object RealMatrixContext : MatrixContext<Double, BufferMatrix<Double>> {
 
 
     override fun multiply(a: Matrix<Double>, k: Number): BufferMatrix<Double> =
-        produce(a.rowNum, a.colNum) { i, j -> a.get(i, j) * k.toDouble() }
+        produce(a.rowNum, a.colNum) { i, j -> a[i, j] * k.toDouble() }
 }
 
 

kmath-core/src/commonMain/kotlin/kscience/kmath/structures/NDStructure.kt

@@ -38,6 +38,7 @@ public interface NDStructure<T> {
      */
     public fun elements(): Sequence<Pair<IntArray, T>>
 
+    //force override equality and hash code
     public override fun equals(other: Any?): Boolean
     public override fun hashCode(): Int
 
@@ -133,6 +134,9 @@ public interface MutableNDStructure<T> : NDStructure<T> {
     public operator fun set(index: IntArray, value: T)
 }
 
+/**
+ * Transform a structure element-by element in place.
+ */
 public inline fun <T> MutableNDStructure<T>.mapInPlace(action: (IntArray, T) -> T): Unit =
     elements().forEach { (index, oldValue) -> this[index] = action(index, oldValue) }
 

settings.gradle.kts

@@ -8,7 +8,7 @@ pluginManagement {
         maven("https://dl.bintray.com/kotlin/kotlinx")
     }
 
-    val toolsVersion = "0.7.1"
+    val toolsVersion = "0.7.2-dev-2"
     val kotlinVersion = "1.4.21"
 
     plugins {