@Test
public void testDiffRatios() {
logger.info("\ntesting diffRatios()");
double[] input = null;
double[] result = null;
assertEquals(0, MathUtil.diffRatios(input).length);
input = new double[] {};
assertEquals(0, MathUtil.diffRatios(input).length);
input = new double[] {1};
assertEquals(0, MathUtil.diffRatios(input).length);
input = new double[] {1, 2};
result = MathUtil.diffRatios(input);
assertEquals(1, result.length);
assertEquals(2.0, result[0], 0.0);
input = new double[] {1, 2, 1, 5};
result = MathUtil.diffRatios(input);
assertEquals(3, result.length);
assertEquals(2.0, result[0], 0.0);
assertEquals(0.5, result[1], 0.0);
assertEquals(5.0, result[2], 0.0);
input = new double[] {1, 2, 0, 5, 8};
result = MathUtil.diffRatios(input);
logger.debug(ListArrayUtil.arrayToString(result));
assertEquals(true, Double.isInfinite(result[2]));
assertEquals(false, Double.isNaN(result[2]));
}
