gpc_utils.h

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#ifndef H_GPC_UTILS
#define H_GPC_UTILS

#include <gsl/gsl_matrix.h>
#include <gsl/gsl_blas.h>
#include <gsl/gsl_linalg.h>
#include <gsl/gsl_poly.h>

/* The GSL is a pain to work with. The library DOES NOT HAVE a determinant() function
  or an inv() function: you have to write your own routines. */

#define gmg gsl_matrix_get
#define gms gsl_matrix_set

void m_trans(const gsl_matrix*A, gsl_matrix*A_t);
void m_mult(const gsl_matrix*A, const gsl_matrix*B, gsl_matrix*AB);
void m_add(const gsl_matrix*A, const gsl_matrix*B, gsl_matrix*ApB);
void m_add_to(const gsl_matrix*A, gsl_matrix*B);
void m_scale(double m, gsl_matrix*A);
double m_dot(const gsl_matrix*A,const gsl_matrix*B);
void m_inv(const gsl_matrix*A, gsl_matrix*invA);
double m_det(const gsl_matrix*A);

/* Returns the real part of the roots in roots */
int poly_real_roots(unsigned int n, const double*a, double *roots);

int poly_greatest_real_root(unsigned int n, const double*a, double *root);

void m_display(const char*str, gsl_matrix*m);

#endif