package com.nr.test.test_chapter9;
import static com.nr.NRUtil.buildVector;
import static com.nr.root.Roots.zrhqr;
import static com.nr.test.NRTestUtil.maxel;
import static org.junit.Assert.fail;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import com.nr.Complex;
public class Test_zrhqr {
@Before
public void setUp() throws Exception {
}
@After
public void tearDown() throws Exception {
}
@Test
public void test() {
int i,j,N=5;
double sbeps=5.e-14;
double a[]={2.0,-2.0,7.0,1.0,-3.0,5.0};
Complex b = new Complex();
double[] aa= buildVector(a),dy = new double[N];
Complex[] rts = new Complex[N];
boolean localflag, globalflag=false;
// Test zrhqr
System.out.println("Testing zrhqr");
// Roots of polynomial
zrhqr(aa,rts);
for (i=0;i<N;i++) {
b=new Complex(a[5]);
for (j=0;j<5;j++) b=b.mul(rts[i]).add(new Complex(a[4-j]));
dy[i]=b.abs();
// System.out.printf(b << " %f\n", dy[i]);
}
System.out.printf("zrhqr: Maximum discrepancy = %f\n", maxel(dy));
localflag = maxel(dy) > sbeps;
globalflag = globalflag || localflag;
if (localflag) {
fail("*** zrhqr: Incorrect roots");
}
if (globalflag) System.out.println("Failed\n");
else System.out.println("Passed\n");
}
}