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Add the possibility to use the polynomial solver of the gsl.

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This commit is contained in:
Manuel Yguel 2010-03-25 03:25:47 +01:00
parent 5ef83d6a6c
commit 89f2d5667f
1 changed files with 22 additions and 0 deletions
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22
test/gsl_helper.h
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@ -33,6 +33,7 @@
#include <gsl/gsl_linalg.h>
#include <gsl/gsl_complex.h>
#include <gsl/gsl_complex_math.h>
#include <gsl/gsl_poly.h>
namespace Eigen {
@ -69,6 +70,27 @@ template<typename Scalar, bool IsComplex = NumTraits<Scalar>::IsComplex> struct
gsl_eigen_gensymmv_free(w);
free(a);
}
template<class EIGEN_VECTOR, class EIGEN_ROOTS>
static void eigen_poly_solve(const EIGEN_VECTOR& poly, EIGEN_ROOTS& roots )
{
const int deg = poly.size()-1;
double *z = new double[2*deg];
double *a = new double[poly.size()];
for( int i=0; i<poly.size(); ++i ){ a[i] = poly[i]; }
gsl_poly_complex_workspace * w = gsl_poly_complex_workspace_alloc (poly.size());
gsl_poly_complex_solve(a, poly.size(), w, z);
gsl_poly_complex_workspace_free (w);
for( int i=0; i<deg; ++i )
{
roots[i].real() = z[2*i];
roots[i].imag() = z[2*i+1];
}
delete[] a;
delete[] z;
}
};
template<typename Scalar> struct GslTraits<Scalar,true>