@Test
public void basicOpsTest() {
/** TRANSPOSE */
double[][] basicArray = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}, {10, 11, 12}};
Matrix m = new Matrix(basicArray);
Matrix t = m.transpose();
double[][] tArray = {{1, 4, 7, 10}, {2, 5, 8, 11}, {3, 6, 9, 12}};
assertTrue(t.equals(new Matrix(tArray)));
double[][] oneElArr = {{4}};
Matrix oneEl = new Matrix(oneElArr);
assertTrue(oneEl.transpose().equals(oneEl));
/** MULTIPLICATION */
Matrix scaledThree = m.multiply(3);
double[][] scaledThreeArr = {{3, 6, 9}, {12, 15, 18}, {21, 24, 27}, {30, 33, 36}};
assertTrue(scaledThree.equals(new Matrix(scaledThreeArr)));
double[][] oneCol = {{1}, {1}, {1}};
Matrix prod = m.multiply(new Matrix(oneCol));
double[][] oneColProd = {{6}, {15}, {24}, {33}};
assertTrue(prod.equals(new Matrix(oneColProd)));
/** TOSTRING */
assertEquals(
m.toString(),
"[[ 1.0, 2.0, 3.0 ], [ 4.0, 5.0, 6.0 ], [ 7.0, 8.0, 9.0 ], [ 10.0, 11.0, 12.0 ] ]");
}
@Test
public void multiplyTwoMatrix() {
int row = 2, column = 2;
int[] firstArrayInput = {1, 2, 3, 4};
int[] secondArrayInput = {2, 3, 4, 5};
int[] expectedOutput = {11, 16, 19, 28};
Matrix firstMatrix = new Matrix(row, column);
Matrix secondMatrix = new Matrix(row, column);
Matrix expectedMatrix = new Matrix(row, column);
firstMatrix.populate(firstArrayInput);
secondMatrix.populate(secondArrayInput);
expectedMatrix.populate(expectedOutput);
Matrix destinationMatrix = firstMatrix.multiply(secondMatrix);
assertArrayEquals(destinationMatrix.matrix, expectedMatrix.matrix);
}