add vector operations

Author: asm-jaime

MLTests/VectorMath.cs

@@ -0,0 +1,32 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace MLTests
+{
+    public static class VectorMath
+    {
+
+        public static double[] ElementwiseMultiplication(double[] vecA, double[] vecB)
+        {
+            return vecA.Select((elementA, index) => elementA * vecB[index]).ToArray();
+        }
+
+        public static double[] ElementwiseAddition(double[] vecA, double[] vecB)
+        {
+            return vecA.Select((elementA, index) => elementA + vecB[index]).ToArray();
+        }
+
+        public static double ElementwiseSum(double[] vecA)
+        {
+            return vecA.Sum();
+        }
+
+        public static double ElementwiseAverage(double[] vecA)
+        {
+            return vecA.Sum() / vecA.Length;
+        }
+    }
+}

MLTests/VectorMathTests.cs

@@ -0,0 +1,21 @@
+using FluentAssertions;
+using NUnit.Framework;
+
+namespace MLTests
+{
+    public class VectorMathTests
+    {
+        [Test]
+        public void TestElementWiseMultiplication()
+        {
+            var A = new double[] { 0, 1, 0, 1 };
+            var B = new double[] { 1, 0, 1, 0 };
+            var C = new double[] { 0, 1, 1, 0 };
+            var D = new double[] { 0.5, 0, 0.5, 0 };
+            var E = new double[] { 0, 1, -1, 0 };
+
+            VectorMath.ElementwiseSum(VectorMath.ElementwiseMultiplication(C, E)).Should().Be(0.0);
+            VectorMath.ElementwiseSum(VectorMath.ElementwiseMultiplication(C, C)).Should().Be(2);
+        }
+    }
+}