package com.nr.test.test_chapter7;
import static com.nr.NRUtil.SQR;
import static java.lang.Math.abs;
import static java.lang.Math.acos;
import static java.lang.Math.sqrt;
import static org.junit.Assert.fail;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.netlib.util.doubleW;
import com.nr.RealValueFun;
import com.nr.ran.Miser;
public class Test_miser {
@Before
public void setUp() throws Exception {
}
@After
public void tearDown() throws Exception {
}
@Test
public void test() {
int i;
doubleW ave= new doubleW(0),var= new doubleW(0);
double tgral,vol,sd,PI=acos(-1.0),R1=3.0,R2=1.0;
double[] regn = new double[6];
boolean localflag, globalflag=false;
// Test miser
System.out.println("Testing miser");
regn[0]=0.0;
regn[1]=-4.0;
regn[2]=-1.0;
regn[3]=4.0;
regn[4]=4.0;
regn[5]=1.0;
vol=1.0;
for (i=0;i<3;i++) vol *= (regn[i+3]-regn[i]);
torusfunc1 torusfunc1 = new torusfunc1();
// Test #1: Compute volume of hemitorus
Miser.miser(torusfunc1,regn,1000000,0.0,ave,var);
tgral=ave.val*vol;
sd=sqrt(var.val)*vol;
// System.out.printf(tgral << " %f\n", sd);
// System.out.printf(SQR(PI)*R1*SQR(R2));
localflag = abs(tgral-SQR(PI)*R1*SQR(R2)) > 2.0*sd;
globalflag = globalflag || localflag;
if (localflag) {
fail("*** miser: Computation of hemitoroid volume is inaccurate");
}
torusfunc2 torusfunc2 = new torusfunc2();
// Test #2: Weight the integral by x
Miser.miser(torusfunc2,regn,1000000,0.0,ave,var);
tgral=ave.val*vol;
sd=sqrt(var.val)*vol;
// System.out.printf(tgral << " %f\n", sd);
// System.out.printf(2.0*PI*SQR(R1)*SQR(R2)*(1+SQR(R2/R1)/4.0));
localflag = abs(tgral-2.0*PI*SQR(R1)*SQR(R2)*(1+SQR(R2/R1)/4.0)) > 2.0*sd;
globalflag = globalflag || localflag;
if (localflag) {
fail("*** miser: Computation of hemitoroid weighted by x is inaccurate");
}
torusfunc3 torusfunc3 = new torusfunc3();
// Test #3: Weight the integral by z^2
Miser.miser(torusfunc3,regn,1000000,0.0,ave,var);
tgral=ave.val*vol;
sd=sqrt(var.val)*vol;
// System.out.printf(tgral << " %f\n", sd);
// System.out.printf(SQR(PI)*R1*SQR(SQR(R2))/4.0);
localflag = abs(tgral-SQR(PI)*R1*SQR(SQR(R2))/4.0) > 2.0*sd;
globalflag = globalflag || localflag;
if (localflag) {
fail("*** miser: Computation of hemitoroid weighted by z^2 is inaccurate");
}
if (globalflag) System.out.println("Failed\n");
else System.out.println("Passed\n");
}
class torusfunc1 implements RealValueFun {
public double funk(final double[] x) {
double R1 = 3.0, R2 = 1.0;
if (SQR(x[2]) + SQR(sqrt(SQR(x[0]) + SQR(x[1])) - R1) <= R2)
return 1.0;
else
return 0.;
}
}
class torusfunc2 implements RealValueFun {
public double funk(final double[] x) {
double R1 = 3.0, R2 = 1.0;
if (SQR(x[2]) + SQR(sqrt(SQR(x[0]) + SQR(x[1])) - R1) <= R2)
return x[0];
else
return 0.;
}
}
class torusfunc3 implements RealValueFun {
public double funk(final double[] x) {
double R1 = 3.0, R2 = 1.0;
if (SQR(x[2]) + SQR(sqrt(SQR(x[0]) + SQR(x[1])) - R1) <= R2)
return SQR(x[2]);
else
return 0.;
}
}
}