package com.nr.test.test_chapter13;
import static com.nr.sp.Fourier.fixrts;
import static com.nr.sp.Fourier.memcof;
import static com.nr.sp.Fourier.predic;
import static java.lang.Math.abs;
import static java.lang.Math.acos;
import static java.lang.Math.exp;
import static java.lang.Math.sin;
import static org.junit.Assert.fail;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.netlib.util.doubleW;
public class Test_predic {
@Before
public void setUp() throws Exception {
}
@After
public void tearDown() throws Exception {
}
@Test
public void test() {
int i,NPTS=500,NPOLES=10,NFUT=20;
double sbeps;
doubleW dum = new doubleW(0);
double[] d=new double[NPOLES],future=new double[NFUT],data=new double[NPTS];
boolean localflag, globalflag=false;
// Test predic
System.out.println("Testing predic");
for (i=0;i<NPTS;i++)
data[i]=f(i+1,NPTS);
memcof(data,dum,d);
fixrts(d);
predic(data,d,future);
sbeps=1.e-5;
for (i=0;i<NFUT;i++) {
// System.out.printf(setw(6) << i << setw(13) << f(NPTS+i+1,NPTS);
// System.out.printf(setw(13) << future[i] << " " << abs(future[i]-f(NPTS+i+1,NPTS)));
localflag = abs(future[i]-f(NPTS+i+1,NPTS)) > sbeps;
globalflag = globalflag || localflag;
if (localflag) {
fail("*** predic: Inaccurate extrapolation");
}
}
if (globalflag) System.out.println("Failed\n");
else System.out.println("Passed\n");
}
double f(int n, int npts)
{
double pi=acos(-1.0);
return exp(-1.0*n/npts)*sin(2.0*pi*n/50.0)
+exp(-2.0*n/npts)*sin(2.2*pi*n/50.0);
}
}