package com.nr.test.test_chapter5;
import static com.nr.NRUtil.buildVector;
import static com.nr.test.NRTestUtil.maxel;
import static com.nr.test.NRTestUtil.vecsub;
import static java.lang.Math.pow;
import static org.junit.Assert.fail;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import com.nr.fe.Ratfn;
public class Test_Ratfn {
@Before
public void setUp() throws Exception {
}
@After
public void tearDown() throws Exception {
}
@Test
public void test() {
int i,M=10;
double x,sbeps=1.e-15;
double b[]={-3.0,15.0,-30.0,30.0,-15.0,3.0}; // Coefficients of 3.0*(x-1.0)^5;
double c[]={-2.0,6.0,-6.0,2.0}; // Coefficients of 2.0*(x-1.0)^3
double d[]={1.5,-7.5,15.0,-15.0,7.5,-1.5,-3.0,3.0,-1.0};
double[] bb = buildVector(b),cc = buildVector(c),dd = buildVector(d),y= new double[M],yy= new double[M];
boolean localflag, globalflag=false;
// Test Ratfn
System.out.println("Testing Ratfn: constructor #1");
Ratfn rp1 = new Ratfn(bb,cc);
for (i=0;i<M;i++) {
x=-4.5+i;
y[i]=rp1.get(x);
yy[i]=(3.0/2.0)*pow(x-1.0,2);
}
System.out.printf("Ratfn: Maximum discrepancy = %f\n", maxel(vecsub(y,yy)));
localflag = maxel(vecsub(y,yy)) > sbeps;
globalflag = globalflag || localflag;
if (localflag) {
fail("*** Ratfn: Rational function returns incorrect values");
}
System.out.println("Testing Ratfn: constructor #2");
Ratfn rp2= new Ratfn(dd,6,4);
for (i=0;i<M;i++) {
x=-4.5+i;
y[i]=rp2.get(x);
yy[i]=(3.0/2.0)*pow(x-1.0,2);
}
System.out.printf("Ratfn: Maximum discrepancy = %f\n", maxel(vecsub(y,yy)));
localflag = maxel(vecsub(y,yy)) > sbeps;
globalflag = globalflag || localflag;
if (localflag) {
fail("*** Ratfn: Rational function returns incorrect values");
}
if (globalflag) System.out.println("Failed\n");
else System.out.println("Passed\n");
}
}