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Adding matrix identity

Author: laucer

src/com/jwetherell/algorithms/mathematics/MatrixIdentity.java

@@ -0,0 +1,12 @@
+package com.jwetherell.algorithms.mathematics;
+
+public class MatrixIdentity {
+
+	public static int[][] getMatrixIdentity(int size){
+		int[][] matrix = new int[size][size];
+		for(int i = 0; i < size; ++i){
+			matrix[i][i] = 1;
+		}
+		return matrix;
+	}
+}

src/com/jwetherell/algorithms/mathematics/MatrixIdentityTest.java

@@ -0,0 +1,20 @@
+package com.jwetherell.algorithms.mathematics.test;
+
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+
+import com.jwetherell.algorithms.mathematics.MatrixIdentity;
+
+public class MatrixIdentityTest {
+
+	@Test
+	public void test1() {
+		int[][] matrix = MatrixIdentity.getMatrixIdentity(3);
+		
+		assertEquals(1, matrix[0][0]);
+		assertEquals(1, matrix[1][1]);
+		assertEquals(1, matrix[2][2]);
+	}
+
+}