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/*
min.c
Ruby/GSL: Ruby extension library for GSL (GNU Scientific Library)
(C) Copyright 2004 by Yoshiki Tsunesada
Ruby/GSL is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License.
This library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY.
*/
#include "rb_gsl.h"
#include "rb_gsl_function.h"
#include <gsl/gsl_min.h>
double rb_gsl_function_f(double x, void *p);
enum {
GSL_MIN_FMINIMIZER_GOLDENSECTION,
GSL_MIN_FMINIMIZER_BRENT,
#ifdef GSL_1_13_LATER
GSL_MIN_FMINIMIZER_QUAD_GOLDEN,
#endif
};
static const gsl_min_fminimizer_type* rb_gsl_min_fminimizer_type_get(VALUE t);
static const gsl_min_fminimizer_type* rb_gsl_min_fminimizer_type_get(VALUE t)
{
char name[32];
switch (TYPE(t)) {
case T_STRING:
strcpy(name, STR2CSTR(t));
if (str_tail_grep(name, "goldensection") == 0)
return gsl_min_fminimizer_goldensection;
else if (str_tail_grep(name, "brent") == 0)
return gsl_min_fminimizer_brent;
#ifdef GSL_1_13_LATER
else if (str_tail_grep(name, "quad_golden") == 0)
return gsl_min_fminimizer_quad_golden;
#endif
else
rb_raise(rb_eTypeError, "unknown type %s (goldensection, brent or quad_golden expected)",
name);
break;
case T_FIXNUM:
switch (FIX2INT(t)) {
case GSL_MIN_FMINIMIZER_GOLDENSECTION:
return gsl_min_fminimizer_goldensection;
break;
case GSL_MIN_FMINIMIZER_BRENT:
return gsl_min_fminimizer_brent;
break;
#ifdef GSL_1_13_LATER
case GSL_MIN_FMINIMIZER_QUAD_GOLDEN:
return gsl_min_fminimizer_quad_golden;
break;
#endif
default:
rb_raise(rb_eTypeError, "unknown type (GOLDENSECION or BRENT or QUAD_GOLDEN expected)");
break;
}
break;
default:
rb_raise(rb_eTypeError, "wrong argument type %s (String of Fixnum)",
rb_class2name(CLASS_OF(t)));
break;
}
}
static VALUE rb_gsl_min_fminimizer_new(VALUE klass, VALUE t)
{
gsl_min_fminimizer *gmf = NULL;
const gsl_min_fminimizer_type *T;
T = rb_gsl_min_fminimizer_type_get(t);
gmf = gsl_min_fminimizer_alloc(T);
return Data_Wrap_Struct(klass, 0, gsl_min_fminimizer_free, gmf);
}
static VALUE rb_gsl_min_fminimizer_name(VALUE obj)
{
gsl_min_fminimizer *gmf = NULL;
Data_Get_Struct(obj, gsl_min_fminimizer, gmf);
return rb_str_new2(gsl_min_fminimizer_name(gmf));
}
static VALUE rb_gsl_min_fminimizer_set(VALUE obj, VALUE ff, VALUE xmin,
VALUE xl, VALUE xu)
{
gsl_min_fminimizer *gmf = NULL;
gsl_function *f = NULL;
Need_Float(xmin); Need_Float(xl); Need_Float(xu);
CHECK_FUNCTION(ff);
Data_Get_Struct(obj, gsl_min_fminimizer, gmf);
Data_Get_Struct(ff, gsl_function, f);
return INT2FIX(gsl_min_fminimizer_set(gmf, f, NUM2DBL(xmin),
NUM2DBL(xl), NUM2DBL(xu)));
}
static VALUE rb_gsl_min_fminimizer_set_with_values(VALUE obj, VALUE ff,
VALUE xmin, VALUE fmin,
VALUE xl, VALUE fl,
VALUE xu, VALUE fu)
{
gsl_min_fminimizer *gmf = NULL;
gsl_function *f = NULL;
Need_Float(xmin); Need_Float(xl); Need_Float(xu);
Need_Float(fl); Need_Float(fu);
CHECK_FUNCTION(ff);
Data_Get_Struct(obj, gsl_min_fminimizer, gmf);
Data_Get_Struct(ff, gsl_function, f);
return INT2FIX(gsl_min_fminimizer_set_with_values(gmf, f, NUM2DBL(xmin),
NUM2DBL(fmin),
NUM2DBL(xl), NUM2DBL(fl),
NUM2DBL(xu), NUM2DBL(fu)));
}
static VALUE rb_gsl_min_fminimizer_iterate(VALUE obj)
{
gsl_min_fminimizer *gmf = NULL;
Data_Get_Struct(obj, gsl_min_fminimizer, gmf);
return INT2FIX(gsl_min_fminimizer_iterate(gmf));
}
static VALUE rb_gsl_min_fminimizer_x_lower(VALUE obj)
{
gsl_min_fminimizer *gmf = NULL;
Data_Get_Struct(obj, gsl_min_fminimizer, gmf);
return rb_float_new(gsl_min_fminimizer_x_lower(gmf));
}
static VALUE rb_gsl_min_fminimizer_x_upper(VALUE obj)
{
gsl_min_fminimizer *gmf = NULL;
Data_Get_Struct(obj, gsl_min_fminimizer, gmf);
return rb_float_new(gsl_min_fminimizer_x_upper(gmf));
}
#if 0
#ifndef GSL_1_2_LATER
static double gsl_min_fminimizer_x_minimum(const gsl_min_fminimizer * s)
{
/* return s->x_minimum;*/
return s->minimum;
}
static double gsl_min_fminimizer_f_minimum(const gsl_min_fminimizer * s)
{
return s->f_minimum;
}
static double gsl_min_fminimizer_f_lower(const gsl_min_fminimizer * s)
{
return s->f_lower;
}
static double gsl_min_fminimizer_f_upper(const gsl_min_fminimizer * s)
{
return s->f_upper;
}
#endif
#endif
static VALUE rb_gsl_min_fminimizer_x_minimum(VALUE obj)
{
gsl_min_fminimizer *gmf = NULL;
Data_Get_Struct(obj, gsl_min_fminimizer, gmf);
return rb_float_new(gsl_min_fminimizer_x_minimum(gmf));
}
static VALUE rb_gsl_min_fminimizer_f_minimum(VALUE obj)
{
gsl_min_fminimizer *gmf = NULL;
Data_Get_Struct(obj, gsl_min_fminimizer, gmf);
return rb_float_new(gsl_min_fminimizer_f_minimum(gmf));
}
static VALUE rb_gsl_min_fminimizer_f_lower(VALUE obj)
{
gsl_min_fminimizer *gmf = NULL;
Data_Get_Struct(obj, gsl_min_fminimizer, gmf);
return rb_float_new(gsl_min_fminimizer_f_lower(gmf));
}
static VALUE rb_gsl_min_fminimizer_f_upper(VALUE obj)
{
gsl_min_fminimizer *gmf = NULL;
Data_Get_Struct(obj, gsl_min_fminimizer, gmf);
return rb_float_new(gsl_min_fminimizer_f_upper(gmf));
}
static VALUE rb_gsl_min_fminimizer_test_interval(VALUE obj, VALUE ea, VALUE er)
{
gsl_min_fminimizer *gmf = NULL;
double xl, xu;
Need_Float(ea); Need_Float(er);
Data_Get_Struct(obj, gsl_min_fminimizer, gmf);
xl = gsl_min_fminimizer_x_lower(gmf);
xu = gsl_min_fminimizer_x_upper(gmf);
return INT2FIX(gsl_min_test_interval(xl, xu, NUM2DBL(ea), NUM2DBL(er)));
}
static VALUE rb_gsl_fminimizer_test_interval(VALUE obj, VALUE xl, VALUE xu,
VALUE ea, VALUE er)
{
Need_Float(xl); Need_Float(xu);
Need_Float(ea); Need_Float(er);
return INT2FIX(gsl_min_test_interval(NUM2DBL(xl), NUM2DBL(xu),
NUM2DBL(ea), NUM2DBL(er)));
}
void Init_gsl_min(VALUE module)
{
VALUE mgsl_min, cgsl_fminimizer;
mgsl_min = rb_define_module_under(module, "Min");
cgsl_fminimizer = rb_define_class_under(mgsl_min, "FMinimizer", cGSL_Object);
rb_define_const(cgsl_fminimizer, "GOLDENSECTION",
INT2FIX(GSL_MIN_FMINIMIZER_GOLDENSECTION));
rb_define_const(cgsl_fminimizer, "Goldensection",
INT2FIX(GSL_MIN_FMINIMIZER_GOLDENSECTION));
rb_define_const(cgsl_fminimizer, "BRENT",
INT2FIX(GSL_MIN_FMINIMIZER_BRENT));
rb_define_const(cgsl_fminimizer, "Brent",
INT2FIX(GSL_MIN_FMINIMIZER_BRENT));
#ifdef GSL_1_13_LATER
rb_define_const(cgsl_fminimizer, "QUAD_GOLDEN",
INT2FIX(GSL_MIN_FMINIMIZER_QUAD_GOLDEN));
#endif
rb_define_singleton_method(cgsl_fminimizer, "new", rb_gsl_min_fminimizer_new, 1);
rb_define_singleton_method(cgsl_fminimizer, "alloc", rb_gsl_min_fminimizer_new, 1);
rb_define_method(cgsl_fminimizer, "name", rb_gsl_min_fminimizer_name, 0);
rb_define_method(cgsl_fminimizer, "set", rb_gsl_min_fminimizer_set, 4);
rb_define_method(cgsl_fminimizer, "set_with_values", rb_gsl_min_fminimizer_set_with_values, 7);
rb_define_method(cgsl_fminimizer, "iterate", rb_gsl_min_fminimizer_iterate, 0);
rb_define_method(cgsl_fminimizer, "x_lower", rb_gsl_min_fminimizer_x_lower, 0);
rb_define_method(cgsl_fminimizer, "x_upper", rb_gsl_min_fminimizer_x_upper, 0);
rb_define_method(cgsl_fminimizer, "test_interval", rb_gsl_min_fminimizer_test_interval, 2);
rb_define_singleton_method(mgsl_min, "test_interval",
rb_gsl_fminimizer_test_interval, 4);
rb_define_method(cgsl_fminimizer, "x_minimum", rb_gsl_min_fminimizer_x_minimum, 0);
rb_define_method(cgsl_fminimizer, "f_minimum", rb_gsl_min_fminimizer_f_minimum, 0);
rb_define_method(cgsl_fminimizer, "f_lower", rb_gsl_min_fminimizer_f_lower, 0);
rb_define_method(cgsl_fminimizer, "f_upper", rb_gsl_min_fminimizer_f_upper, 0);
}
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