/** Test of getVariance method, of class GeneralDiscrete. */
@Test
public void testmeanandvar() {
System.out.println("test mean and variance");
Map<Integer, Double> pdf = new HashMap<Integer, Double>(2);
pdf.put(1, 0.5);
pdf.put(3, 0.5);
GeneralDiscreteRandomVariable dist = new GeneralDiscreteRandomVariable(pdf);
assertEquals(2.0, dist.mean(), 0.000001);
assertEquals(1.0, dist.variance(), 0.000001);
}
/** Test of getVariance method, of class GeneralDiscrete. */
@Test
public void testcdf() {
System.out.println("test cdf");
Map<Integer, Double> pdf = new HashMap<Integer, Double>(2);
pdf.put(1, 0.5);
pdf.put(3, 0.5);
GeneralDiscreteRandomVariable dist = new GeneralDiscreteRandomVariable(pdf);
assertEquals(0.5, dist.cmf(1), 0.000001);
assertEquals(1.0, dist.cmf(3), 0.000001);
assertEquals(0.5, dist.cmf(2), 0.000001);
assertEquals(1.0, dist.cmf(5), 0.000001);
assertEquals(1.0, dist.cmf(4), 0.000001);
assertEquals(0, dist.cmf(0), 0.000001);
}
/** Test of getVariance method, of class GeneralDiscrete. */
@Test
public void testnoise() {
System.out.println("test noise");
Map<Integer, Double> pdf = new HashMap<Integer, Double>(2);
pdf.put(1, 0.7);
pdf.put(3, 0.3);
GeneralDiscreteRandomVariable dist = new GeneralDiscreteRandomVariable(pdf);
int iters = 100000;
double count1s = 0;
double count3s = 0;
for (int i = 0; i < iters; i++) {
int n = (int) Math.round(dist.noise());
if (n == 1) count1s++;
else if (n == 3) count3s++;
else fail("noise returned a value of zero probability!");
}
assertEquals(0.7, count1s / iters, 0.01);
assertEquals(0.3, count3s / iters, 0.01);
}