package com.nr.test.test_chapter7;
import static com.nr.NRUtil.buildVector;
import static com.nr.stat.Stattests.chsone;
import static org.junit.Assert.fail;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.netlib.util.doubleW;
import com.nr.ran.Poissondev;
import com.nr.sf.Poissondist;
public class Test_Poissondev {
@Before
public void setUp() throws Exception {
}
@After
public void tearDown() throws Exception {
}
@Test
public void test() {
int i,nbin,N=100000,M=10;
doubleW df = new doubleW(0);
doubleW chisq = new doubleW(0);
doubleW prob = new doubleW(0);
double lambda;
int fpr[]={0,4,2,3,4,4,3,3,7,2};
int[] fingerprint=buildVector(fpr);
double[] bins =new double[M],ebins =new double[M]; // x is not used
boolean localflag, globalflag=false;
// Test Poissondev
System.out.println("Testing Poissondev");
// Check fingerprint of doub()
lambda=3.0;
Poissondev myran = new Poissondev(lambda,17);
localflag=false;
for (i=0;i<10;i++)
// System.out.printf(setw(25) << setprecision(20) << myran.dev());
localflag=localflag || (myran.dev() != fingerprint[i]);
globalflag = globalflag || localflag;
if (localflag) {
fail("*** Poissondev: dev() does not match fingerprint");
}
// Check statistics
Poissondist expect = new Poissondist(lambda);
for (i=0;i<M;i++) {
ebins[i]=N*expect.p(i);
bins[i]=0;
}
for (i=0;i<N;i++) {
nbin=myran.dev();
if ((nbin >= 0) && (nbin < M)) bins[nbin] += 1;
}
chsone(bins,ebins,df,chisq,prob);
System.out.printf(" chisq,dev(): %f prob: %f\n",chisq.val, prob.val);
localflag = (prob.val < 0.05);
globalflag = globalflag || localflag;
if (localflag) {
fail("*** Poissondev: dev() does not give distribution with correct variance");
}
if (globalflag) System.out.println("Failed\n");
else System.out.println("Passed\n");
}
}