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/* min/test_funcs.c
*
* Copyright (C) 1996, 1997, 1998, 1999, 2000 Brian Gough
*
* 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.
*/
#include <gsl/gsl_math.h>
#include <gsl/gsl_min.h>
#include "test.h"
gsl_function create_function (double (*f)(double, void *))
{
gsl_function F ;
F.function = f ;
F.params = 0 ;
return F ;
}
double
f_cos (double x, void * p)
{
p = 0; /* avoid warning about unused parameter */
return cos(x);
}
/* f(x) = x^4 - 1 */
/* minimum at x = 0 */
double
func1 (double x, void * p)
{
p = 0; /* avoid warning about unused parameter */
return pow (x, 4.0) - 1;
}
/* f(x) = sqrt(|x|) */
/* minimum at x = 0 */
double
func2 (double x, void * p)
{
p = 0; /* avoid warning about unused parameter */
return sqrt(fabs(x));
}
/* f(x) = 1 for x < 1 and -exp(-x) for x >= 1 */
/* minimum at x = 1 */
double
func3 (double x, void * p)
{
p = 0; /* avoid warning about unused parameter */
if (x < 1)
return 1 ;
else
return - exp(-x) ;
}
/* f(x) = x - 30/(1+1e5*(x-0.8)**2) */
/* minimum near x = 0.8 */
double
func4 (double x, void * p)
{
p = 0; /* avoid warning about unused parameter */
return x - 30.0 / (1.0 + 1e5 * pow(x-0.8, 2.0));
}
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