package com.nr.test.test_chapter9;
import static org.junit.Assert.fail;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import com.nr.UniVarRealValueFun;
import com.nr.root.Roots.Zbrak;
import com.nr.sf.Bessjy;
public class Test_zbrak {
@Before
public void setUp() throws Exception {
}
@After
public void tearDown() throws Exception {
}
@Test
public void test() {
int i;
int nroot = 0;
double[] xb1,xb2;
double x1=1.0,x2=50.0;
double y[]={2.404825557695773,5.520078110286311,8.653727912911013,
1.179153443901428e1,1.493091770848779e1,1.807106396791092e1,
2.121163662987926e1,2.435247153074930e1,2.749347913204025e1,
3.063460646843198e1,3.377582021357357e1,3.691709835366405e1,
4.005842576462825e1,4.319979171317673e1,4.634118837166182e1,
4.948260989739782e1};
boolean localflag=false, globalflag=false;
// Test zbrak
System.out.println("Testing zbrak");
Func_zbrak fx = new Func_zbrak();
Zbrak z = new Zbrak(); z.zbrak(fx,x1,x2,100);
xb1= z.xb1;xb2=z.xb2;nroot = z.nroot;
for (i=0;i<nroot;i++)
localflag = localflag || (fx.funk(xb1[i])*fx.funk(xb2[i]) >= 0.0);
globalflag = globalflag || localflag;
if (localflag) {
fail("*** zbrak: One of the returned intervals does not contain a root.");
}
for (i=0;i<nroot;i++)
localflag=localflag || (y[i] < xb1[i]) || (y[i] > xb2[i]);
globalflag = globalflag || localflag;
if (localflag) {
fail("*** zbrak: A known root of bessj0 does not fall in the identified intervals.");
}
if (globalflag) System.out.println("Failed\n");
else System.out.println("Passed\n");
}
class Func_zbrak implements UniVarRealValueFun {
Bessjy b = new Bessjy();
public double funk (final double x) {
return b.j0(x);
}
};
}