package com.nr.test.test_chapter6;
import static com.nr.sf.Integrals.invxlogx;
import static java.lang.Math.abs;
import static java.lang.Math.exp;
import static java.lang.Math.log;
import static org.junit.Assert.fail;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import com.nr.ran.Ran;
public class Test_invxlogx {
@Before
public void setUp() throws Exception {
}
@After
public void tearDown() throws Exception {
}
@Test
public void test() {
int i,N=100000;
double x,y1,y2,sbeps=1.0e-15;
boolean localflag, globalflag=false;
// Test invxlogx
System.out.println("Testing invxlogx");
Ran myran = new Ran(17);
for (i=0;i<N;i++) {
y1 = -exp(-1.0)*myran.doub();
// System.out.printf(setprecision(17) << y1;
x=invxlogx(y1);
y2=x*log(x);
// System.out.println(" %f\n", x << " %f\n", y2);
localflag = abs(y1-y2)>sbeps;
globalflag = globalflag || localflag;
if (localflag) {
fail("*** invxlogx: Incorrect function value for y=y1");
}
}
if (globalflag) System.out.println("Failed\n");
else System.out.println("Passed\n");
}
}