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.Bilin_interp;
import com.nr.ran.Ran;
public class Test_Bilin_interp {
@Before
public void setUp() throws Exception {
}
@After
public void tearDown() throws Exception {
}
@Test
public void test() {
double sbeps,xx1,xx2;
int i,j,N=20;
double[] x1=new double[N],x2=new double[N],yy=new double[N],zz=new double[N];
double[][] y = new double[N][N];
boolean localflag, globalflag=false;
// Test Bilin_interp
System.out.println("Testing Bilin_interp");
for(i=0;i<N;i++) {
x1[i]=(double)(i)/(N-1);
for(j=0;j<N;j++) {
x2[j]=(double)(j)/(N-1);
y[i][j]=x1[i]+x2[j];
}
}
Bilin_interp z = new Bilin_interp(x1,x2,y);
Ran myran = new Ran(17);
for (i=0;i<N;i++) {
xx1=myran.doub();
xx2=myran.doub();
yy[i]=z.interp(xx1,xx2); // interpolated values
zz[i]=xx1+xx2; // Actual values
}
sbeps=1.e-15;
System.out.printf(" Bilin_interp: Max. actual error: %f\n", maxel(vecsub(zz,yy)));
localflag = maxel(vecsub(zz,yy)) > sbeps;
globalflag = globalflag || localflag;
if (localflag) {
fail("*** Bilin_interp: Inaccurate interpolation of 2D linear function.");
}
if (globalflag) System.out.println("Failed\n");
else System.out.println("Passed\n");
}
}