package com.nr.test.test_chapter3;
import static com.nr.test.NRTestUtil.maxel;
import static com.nr.test.NRTestUtil.vecsub;
import static java.lang.Math.acos;
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 com.nr.interp.Spline_interp;
import com.nr.ran.Ran;
public class Test_Spline_interp {
@Before
public void setUp() throws Exception {
}
@After
public void tearDown() throws Exception {
}
@Test
public void test() {
double sbeps;
int i,N=20;
double yp1,ypn,pi;
double[] x= new double[N],y= new double[N],xx= new double[N],yy= new double[N],zz= new double[N];
boolean localflag, globalflag=false;
// Test Spline_interp
System.out.println("Testing Spline_interp");
pi=acos(-1.0);
for(i=0;i<N;i++) {
x[i]=(i)*pi/(N-1);
y[i]=sin(x[i]);
}
yp1=1.0;
ypn=-1.0;
Spline_interp z = new Spline_interp(x,y,yp1,ypn);
Ran myran = new Ran(17);
for(i=0;i<N;i++) {
xx[i]=pi*myran.doub();
yy[i]=z.interp(xx[i]);
zz[i]=sin(xx[i]);
}
System.out.printf(" Spline_interp: Max. actual error: %f\n", maxel(vecsub(zz,yy)));
sbeps=1.e-5*maxel(y);
localflag = maxel(vecsub(zz,yy)) > sbeps;
globalflag = globalflag || localflag;
if (localflag) {
fail("*** Spline_interp: Inaccurate interpolation of sin() function.");
}
if (globalflag) System.out.println("Failed\n");
else System.out.println("Passed\n");
}
}