- Matrix m1 = new Matrix(new double[][] { { 2, 3, 4 }, { -3, 4, 15 } });
- m1.subtractAllFrom(12.5);
- assertEquals(m1.getValue(0, 0), 10.5d);
- assertEquals(m1.getValue(0, 1), 9.5d);
- assertEquals(m1.getValue(0, 2), 8.5d);
- assertEquals(m1.getValue(1, 0), 15.5d);
- assertEquals(m1.getValue(1, 1), 8.5d);
- assertEquals(m1.getValue(1, 2), -2.5d);
+ Matrix m1 = new Matrix(
+ new double[][]
+ { { 2, 3.5, 4 }, { -3.4, 4, 15 } });
+
+ /*
+ * subtract all from max: range -3.4 to 15 becomes 18.4 to 0
+ */
+ m1.reverseRange(true);
+ assertEquals(m1.getValue(0, 0), 13d, DELTA);
+ assertEquals(m1.getValue(0, 1), 11.5d, DELTA);
+ assertEquals(m1.getValue(0, 2), 11d, DELTA);
+ assertEquals(m1.getValue(1, 0), 18.4d, DELTA);
+ assertEquals(m1.getValue(1, 1), 11d, DELTA);
+ assertEquals(m1.getValue(1, 2), 0d, DELTA);
+
+ /*
+ * repeat operation - range is now 0 to 18.4
+ */
+ m1.reverseRange(true);
+ assertEquals(m1.getValue(0, 0), 5.4d, DELTA);
+ assertEquals(m1.getValue(0, 1), 6.9d, DELTA);
+ assertEquals(m1.getValue(0, 2), 7.4d, DELTA);
+ assertEquals(m1.getValue(1, 0), 0d, DELTA);
+ assertEquals(m1.getValue(1, 1), 7.4d, DELTA);
+ assertEquals(m1.getValue(1, 2), 18.4d, DELTA);
+ }
+
+ /**
+ * Test range reversal with minimum and maximum values swapped
+ */
+ @Test(groups = "Functional")
+ public void testReverseRange_swapMinMax()
+ {
+ Matrix m1 = new Matrix(
+ new double[][]
+ { { 2, 3.5, 4 }, { -3.4, 4, 15 } });
+
+ /*
+ * swap all values in min-max range
+ * = subtract from (min + max = 11.6)
+ * range -3.4 to 15 becomes 18.4 to -3.4
+ */
+ m1.reverseRange(false);
+ assertEquals(m1.getValue(0, 0), 9.6d, DELTA);
+ assertEquals(m1.getValue(0, 1), 8.1d, DELTA);
+ assertEquals(m1.getValue(0, 2), 7.6d, DELTA);
+ assertEquals(m1.getValue(1, 0), 15d, DELTA);
+ assertEquals(m1.getValue(1, 1), 7.6d, DELTA);
+ assertEquals(m1.getValue(1, 2), -3.4d, DELTA);
+
+ /*
+ * repeat operation - original values restored
+ */
+ m1.reverseRange(false);
+ assertEquals(m1.getValue(0, 0), 2d, DELTA);
+ assertEquals(m1.getValue(0, 1), 3.5d, DELTA);
+ assertEquals(m1.getValue(0, 2), 4d, DELTA);
+ assertEquals(m1.getValue(1, 0), -3.4d, DELTA);
+ assertEquals(m1.getValue(1, 1), 4d, DELTA);
+ assertEquals(m1.getValue(1, 2), 15d, DELTA);