September 2017 Update

Task/Matrix-transposition/Kotlin/matrix-transposition.kotlin

@@ -0,0 +1,28 @@
+// version 1.1.3
+
+typealias Vector = DoubleArray
+typealias Matrix = Array<Vector>
+
+fun Matrix.transpose(): Matrix {
+    val rows = this.size
+    val cols = this[0].size
+    val trans = Matrix(cols) { Vector(rows) }
+    for (i in 0 until cols) {
+        for (j in 0 until rows) trans[i][j] = this[j][i]
+    }
+    return trans
+}
+
+fun printMatrix(m: Matrix) {
+    for (i in 0 until m.size) println(m[i].contentToString())
+}
+
+fun main(args: Array<String>) {
+    val m = arrayOf(
+        doubleArrayOf( 1.0,  2.0,  3.0),
+        doubleArrayOf( 4.0,  5.0,  6.0),
+        doubleArrayOf( 7.0,  8.0,  9.0),
+        doubleArrayOf(10.0, 11.0, 12.0)
+    )
+    printMatrix(m.transpose())
+}