private static void doTestSample(float rate) {
PoissonPDF pdf = new PoissonPDF(rate);
int n = 1000;
int[] bins = new int[100];
for (int i = 0; i < n; i++) {
int sample = (int) Math.round(pdf.sample()[0]);
if (sample < bins.length) bins[sample]++;
}
for (int i = 0; i < bins.length; i++) {
TestUtil.assertClose(pdf.map(new float[]{i}), (float) bins[i]/ (float) n, .05f);
}