package com.nr.test.test_chapter7;
import static com.nr.NRUtil.buildVector;
import static com.nr.stat.Stattests.chsone;
import static java.lang.Math.abs;
import static java.lang.Math.floor;
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.Gammadev;
import com.nr.sf.Gammadist;
public class Test_Gammadev {
@Before
public void setUp() throws Exception {
}
@After
public void tearDown() throws Exception {
}
@Test
public void test() {
int i,nbin,N=100000,M=1000;
doubleW df = new doubleW(0);
doubleW chisq = new doubleW(0);
doubleW prob = new doubleW(0);
double range=10.0,alpha,beta,binsize,sbeps=2.e-15;
double fpr[]={4.9886631780655621,2.1169108315306531,0.80651179816628638,
2.6460107411356208,4.0099509519546519,1.942804746662151,
3.7042540063195508,2.3875743636427345,1.9483140166958288,
2.4434025578383811};
double[] fingerprint = buildVector(fpr);
double[] x = new double[M],bins=new double[M],ebins=new double[M];
boolean localflag, globalflag=false;
// Test Gammadev
System.out.println("Testing Gammadev");
// Check fingerprint of doub()
alpha=3.0;
beta=1.0;
Gammadev myran=new Gammadev(alpha,beta,17);
localflag=false;
for (i=0;i<10;i++)
// System.out.printf(setw(25) << setprecision(20) << myran.dev());
localflag=localflag || abs(myran.dev()-fingerprint[i])>sbeps;
globalflag = globalflag || localflag;
if (localflag) {
fail("*** Gammadev: dev() does not match fingerprint");
}
// Check statistics
Gammadist expect=new Gammadist(alpha,beta);
binsize=range/M;
for (i=0;i<M;i++) {
x[i]=binsize*i;
ebins[i]=N*binsize*expect.p(x[i]+0.5*binsize);
bins[i]=0;
}
for (i=0;i<N;i++) {
nbin=(int)(floor(myran.dev()/binsize));
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("*** Gammadev: dev() does not give distribution with correct variance");
}
if (globalflag) System.out.println("Failed\n");
else System.out.println("Passed\n");
}
}