Added MatrixMath class

test/zutil/math/MatrixMathTest.java

@@ -0,0 +1,61 @@
+package zutil.math;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+/**
+ *
+ */
+public class MatrixMathTest {
+
+    @Test
+    public void scalarAdd(){
+        assertArrayEquals(new double[][]{{4,5},{-2,11}},
+                MatrixMath.add(new double[][]{{2,3},{-4,9}}, 2));
+    }
+
+    @Test
+    public void scalarSubtraction(){
+        assertArrayEquals(new double[][]{{0,1},{-6,7}},
+                MatrixMath.subtract(new double[][]{{2,3},{-4,9}}, 2));
+    }
+
+    @Test
+    public void scalarMultiply(){
+        assertArrayEquals(new double[][]{{4,6},{-8,18}},
+                MatrixMath.multiply(new double[][]{{2,3},{-4,9}}, 2));
+    }
+
+    @Test
+    public void scalarDivision(){
+        assertArrayEquals(new double[][]{{1,2},{-2,5}},
+                MatrixMath.divide(new double[][]{{2,4},{-4,10}}, 2));
+    }
+
+
+
+    @Test
+    public void elementalAdd(){
+        assertArrayEquals(new double[][]{{3,5},{-1,13}},
+                MatrixMath.add(new double[][]{{2,3},{-4,9}}, new double[][]{{1,2},{3,4}}));
+    }
+
+    @Test
+    public void elementalSubtract(){
+        assertArrayEquals(new double[][]{{1,1},{-7,5}},
+                MatrixMath.subtract(new double[][]{{2,3},{-4,9}}, new double[][]{{1,2},{3,4}}));
+    }
+
+    @Test
+    public void elementalMultiply(){
+        assertArrayEquals(new double[][]{{2,6},{-12,36}},
+                MatrixMath.multiply(new double[][]{{2,3},{-4,9}}, new double[][]{{1,2},{3,4}}));
+    }
+
+    @Test
+    public void elementalDivision(){
+        assertArrayEquals(new double[][]{{2,2},{-3,3}},
+                MatrixMath.divide(new double[][]{{2,4},{-9,12}}, new double[][]{{1,2},{3,4}}));
+    }
+}