/* multimin/gsl_multimin.h *  * Copyright (C) 1996, 1997, 1998, 1999, 2000 Fabrice Rossi *  * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or (at * your option) any later version. *  * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU * General Public License for more details. *  * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *//* Modified by Tuomo Keskitalo to include fminimizer and    Nelder Mead related lines */#ifndef __GSL_MULTIMIN_H__#define __GSL_MULTIMIN_H__#include <stdlib.h>#include <gsl/gsl_types.h>#include <gsl/gsl_math.h>#include <gsl/gsl_vector.h>#include <gsl/gsl_matrix.h>#include <gsl/gsl_min.h>#undef __BEGIN_DECLS#undef __END_DECLS#ifdef __cplusplus# define __BEGIN_DECLS extern "C" {# define __END_DECLS }#else# define __BEGIN_DECLS /* empty */# define __END_DECLS /* empty */#endif__BEGIN_DECLS/* Definition of an arbitrary real-valued function with gsl_vector input and *//* parameters */struct gsl_multimin_function_struct {  double (* f) (const gsl_vector * x, void * params);  size_t n;  void * params;};typedef struct gsl_multimin_function_struct gsl_multimin_function;#define GSL_MULTIMIN_FN_EVAL(F,x) (*((F)->f))(x,(F)->params)/* Definition of an arbitrary differentiable real-valued function *//* with gsl_vector input and parameters */struct gsl_multimin_function_fdf_struct {  double (* f) (const gsl_vector  * x, void * params);  void (* df) (const gsl_vector * x, void * params,gsl_vector * df);  void (* fdf) (const gsl_vector * x, void * params,double *f,gsl_vector * df);  size_t n;  void * params;};typedef struct gsl_multimin_function_fdf_struct gsl_multimin_function_fdf;#define GSL_MULTIMIN_FN_EVAL_F(F,x) (*((F)->f))(x,(F)->params)#define GSL_MULTIMIN_FN_EVAL_DF(F,x,g) (*((F)->df))(x,(F)->params,(g))#define GSL_MULTIMIN_FN_EVAL_F_DF(F,x,y,g) (*((F)->fdf))(x,(F)->params,(y),(g))int gsl_multimin_diff (const gsl_multimin_function * f,                       const gsl_vector * x, gsl_vector * g);/* minimization of non-differentiable functions */typedef struct {  const char *name;  size_t size;  int (*alloc) (void *state, size_t n);  int (*set) (void *state, gsl_multimin_function * f,              const gsl_vector * x,               double * size,              const gsl_vector * step_size);  int (*iterate) (void *state, gsl_multimin_function * f,                   gsl_vector * x,                   double * size,                  double * fval);  void (*free) (void *state);}gsl_multimin_fminimizer_type;typedef struct {  /* multi dimensional part */  const gsl_multimin_fminimizer_type *type;  gsl_multimin_function *f;  double fval;  gsl_vector * x;    double size;  void *state;}gsl_multimin_fminimizer;gsl_multimin_fminimizer *gsl_multimin_fminimizer_alloc(const gsl_multimin_fminimizer_type *T,                              size_t n);int gsl_multimin_fminimizer_set (gsl_multimin_fminimizer * s,                             gsl_multimin_function * f,                             const gsl_vector * x,                             const gsl_vector * step_size);voidgsl_multimin_fminimizer_free(gsl_multimin_fminimizer *s);const char * gsl_multimin_fminimizer_name (const gsl_multimin_fminimizer * s);intgsl_multimin_fminimizer_iterate(gsl_multimin_fminimizer *s);gsl_vector * gsl_multimin_fminimizer_x (const gsl_multimin_fminimizer * s);double gsl_multimin_fminimizer_minimum (const gsl_multimin_fminimizer * s);doublegsl_multimin_fminimizer_size (const gsl_multimin_fminimizer * s);/* Convergence test functions */intgsl_multimin_test_gradient(const gsl_vector * g,double epsabs);intgsl_multimin_test_size(const double size ,double epsabs);/* minimisation of differentiable functions */typedef struct {  const char *name;  size_t size;  int (*alloc) (void *state, size_t n);  int (*set) (void *state, gsl_multimin_function_fdf * fdf,              const gsl_vector * x, double * f,               gsl_vector * gradient, double step_size, double tol);  int (*iterate) (void *state,gsl_multimin_function_fdf * fdf,                   gsl_vector * x, double * f,                   gsl_vector * gradient, gsl_vector * dx);  int (*restart) (void *state);  void (*free) (void *state);}gsl_multimin_fdfminimizer_type;typedef struct {  /* multi dimensional part */  const gsl_multimin_fdfminimizer_type *type;  gsl_multimin_function_fdf *fdf;  double f;  gsl_vector * x;  gsl_vector * gradient;  gsl_vector * dx;  void *state;}gsl_multimin_fdfminimizer;gsl_multimin_fdfminimizer *gsl_multimin_fdfminimizer_alloc(const gsl_multimin_fdfminimizer_type *T,                                size_t n);int gsl_multimin_fdfminimizer_set (gsl_multimin_fdfminimizer * s,                               gsl_multimin_function_fdf *fdf,                               const gsl_vector * x,                               double step_size, double tol);voidgsl_multimin_fdfminimizer_free(gsl_multimin_fdfminimizer *s);const char * gsl_multimin_fdfminimizer_name (const gsl_multimin_fdfminimizer * s);intgsl_multimin_fdfminimizer_iterate(gsl_multimin_fdfminimizer *s);intgsl_multimin_fdfminimizer_restart(gsl_multimin_fdfminimizer *s);gsl_vector * gsl_multimin_fdfminimizer_x (gsl_multimin_fdfminimizer * s);gsl_vector * gsl_multimin_fdfminimizer_dx (gsl_multimin_fdfminimizer * s);gsl_vector * gsl_multimin_fdfminimizer_gradient (gsl_multimin_fdfminimizer * s);double gsl_multimin_fdfminimizer_minimum (gsl_multimin_fdfminimizer * s);GSL_VAR const gsl_multimin_fdfminimizer_type *gsl_multimin_fdfminimizer_steepest_descent;GSL_VAR const gsl_multimin_fdfminimizer_type *gsl_multimin_fdfminimizer_conjugate_pr;GSL_VAR const gsl_multimin_fdfminimizer_type *gsl_multimin_fdfminimizer_conjugate_fr;GSL_VAR const gsl_multimin_fdfminimizer_type *gsl_multimin_fdfminimizer_vector_bfgs;GSL_VAR const gsl_multimin_fminimizer_type *gsl_multimin_fminimizer_nmsimplex;__END_DECLS#endif /* __GSL_MULTIMIN_H__ */