3 * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 Brian Gough
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 3 of the License, or (at
8 * your option) any later version.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
20 #include <gsl/gsl_math.h>
21 #include <gsl/gsl_min.h>
25 gsl_function create_function (double (*f)(double, void *))
34 f_cos (double x, void * p)
36 p = 0; /* avoid warning about unused parameter */
41 /* minimum at x = 0 */
44 func1 (double x, void * p)
46 p = 0; /* avoid warning about unused parameter */
47 return pow (x, 4.0) - 1;
50 /* f(x) = sqrt(|x|) */
51 /* minimum at x = 0 */
54 func2 (double x, void * p)
56 p = 0; /* avoid warning about unused parameter */
61 /* f(x) = 1 for x < 1 and -exp(-x) for x >= 1 */
62 /* minimum at x = 1 */
65 func3 (double x, void * p)
67 p = 0; /* avoid warning about unused parameter */
75 /* f(x) = x - 30/(1+1e5*(x-0.8)**2) */
76 /* minimum near x = 0.8 */
79 func4 (double x, void * p)
81 p = 0; /* avoid warning about unused parameter */
83 return x - 30.0 / (1.0 + 1e5 * pow(x-0.8, 2.0));