test_cpoly_roots.cxx

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#include <vnl/vnl_real_polynomial.h>
#include <vnl/algo/vnl_cpoly_roots.h>

#include <testlib/testlib_test.h>

void test_cpoly_roots()
{
  const double coeffs[] = {6, 5, 4, 3, 2, 1};
  vnl_vector<double> a(coeffs, 6);

  vnl_vector<double> monic( (a/a[0]).extract(a.size()-1,1) );
  vnl_cpoly_roots roots( monic, 0.0*monic );

  testlib_test_assert( "Number of solutions", roots.solns.size() == monic.size() );

  // Evaluate results
  vnl_real_polynomial f(a);
  for (int i = 0; i < f.degree(); ++i)
    testlib_test_assert("Root residual", vcl_abs(f.evaluate(roots.solns[i])) < 1e-12);
}

TESTMAIN(test_cpoly_roots);