package com.nr.test.test_chapter13;
import static java.lang.Math.abs;
import static org.junit.Assert.fail;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import com.nr.ran.Ran;
import com.nr.sp.Daub4;
import static com.nr.sp.Wavelet.*;
public class Test_wtn {
@Before
public void setUp() throws Exception {
}
@After
public void tearDown() throws Exception {
}
@Test
public void test() {
int i,j,jj,NDIM=2,N=128,M=32,NTRY=10;
double sum,sbeps=5.e-15;
int[] nn=new int[NDIM];
double[] a=new double[N*M];
boolean localflag, globalflag=false;
// Test wtn
System.out.println("Testing wtn");
Daub4 d4=new Daub4();
Ran myran = new Ran(17);
nn[0]=N;
nn[1]=M;
for (i=0;i<NTRY;i++) {
for (j=0;j<M*N;j++) a[j]=0.0;
jj=myran.int32p() % (M*N);
a[jj]=1.0;
wtn(a,nn,-1,d4);
// for (j=0;j<N;j++) System.out.printf(setw(8) << a[j] << " ";
// System.out.printf(endl;
sum=0;
for (j=0;j<M*N;j++) sum += a[j];
// System.out.printf(sum);
localflag = abs(sum) > sbeps;
globalflag = globalflag || localflag;
if (localflag) {
fail("*** wtn: Sum of wavelet coefficients had unexpected value");
}
wtn(a,nn,+1,d4);
// for (j=0;j<N;j++) System.out.printf(setw(8) << a[j] << " ";
// System.out.printf(endl;
for (j=0;j<M*N;j++) {
if (j == jj) localflag = abs(a[j]-1.0) > sbeps;
else localflag = abs(a[j]) > sbeps;
globalflag = globalflag || localflag;
if (localflag) {
fail("*** wtn: Round-trip test did not return to original data");
}
}
}
if (globalflag) System.out.println("Failed\n");
else System.out.println("Passed\n");
}
}