package com.nr.test.test_chapter3;
import static com.nr.test.NRTestUtil.*;
import static org.junit.Assert.fail;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import com.nr.interp.Poly_interp;
import com.nr.ran.Ran;
public class Test_Poly_interp {
@Before
public void setUp() throws Exception {
}
@After
public void tearDown() throws Exception {
}
@Test
public void test() {
double sbeps;
int i,N=20;
double[] x= new double[N],y= new double[N],xx= new double[N],yy= new double[N],zz= new double[N],dyy= new double[N];
boolean localflag, globalflag=false;
// Test Poly_interp
System.out.println("Testing Poly_interp");
for (i=0;i<N;i++) {
x[i]=(double)(i)/(N-1);
y[i]=1.0+x[i]*(1.0+x[i]*(1.0+x[i]*(1.0+x[i])));
}
Ran myran = new Ran(17);
Poly_interp z = new Poly_interp(x,y,3);
for (i=0;i<N;i++) {
xx[i]=myran.doub();
yy[i]=z.interp(xx[i]); // interpolated values
dyy[i]=z.dy; // Estimated errors
zz[i]=1.0+xx[i]*(1.0+xx[i]*(1.0+xx[i]*(1.0+xx[i]))); // Actual Values
}
System.out.printf(" Poly_interp: Max. estimated error: %f\n", maxel(dyy));
System.out.printf(" Poly_interp: Max. actual error: %f\n", maxel(vecsub(zz,yy)));
sbeps = 0.001*maxel(y);
localflag = maxel(vecsub(zz,yy)) > sbeps;
globalflag = globalflag || localflag;
if (localflag) {
fail("*** Poly_interp: interpolation of 4th-order polynomial unsuccessful.");
}
if (globalflag) System.out.println("Failed\n");
else System.out.println("Passed\n");
}
}