1 /* multifit_nlinear/gsl_multifit_nlinear.h
3 * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 Brian Gough
4 * Copyright (C) 2015, 2016 Patrick Alken
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 3 of the License, or (at
9 * your option) any later version.
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
21 #ifndef __GSL_MULTIFIT_NLINEAR_H__
22 #define __GSL_MULTIFIT_NLINEAR_H__
25 #include <gsl/gsl_types.h>
26 #include <gsl/gsl_math.h>
27 #include <gsl/gsl_vector.h>
28 #include <gsl/gsl_matrix.h>
29 #include <gsl/gsl_permutation.h>
34 # define __BEGIN_DECLS extern "C" {
35 # define __END_DECLS }
37 # define __BEGIN_DECLS /* empty */
38 # define __END_DECLS /* empty */
45 GSL_MULTIFIT_NLINEAR_FWDIFF,
46 GSL_MULTIFIT_NLINEAR_CTRDIFF
47 } gsl_multifit_nlinear_fdtype;
49 /* Definition of vector-valued functions and gradient with parameters
50 based on gsl_vector */
54 int (* f) (const gsl_vector * x, void * params, gsl_vector * f);
55 int (* df) (const gsl_vector * x, void * params, gsl_matrix * df);
56 int (* fvv) (const gsl_vector * x, const gsl_vector * v, void * params,
58 size_t n; /* number of functions */
59 size_t p; /* number of independent variables */
60 void * params; /* user parameters */
61 size_t nevalf; /* number of function evaluations */
62 size_t nevaldf; /* number of Jacobian evaluations */
63 size_t nevalfvv; /* number of fvv evaluations */
64 } gsl_multifit_nlinear_fdf;
66 /* trust region subproblem method */
70 void * (*alloc) (const void * params, const size_t n, const size_t p);
71 int (*init) (const void * vtrust_state, void * vstate);
72 int (*preloop) (const void * vtrust_state, void * vstate);
73 int (*step) (const void * vtrust_state, const double delta,
74 gsl_vector * dx, void * vstate);
75 int (*preduction) (const void * vtrust_state, const gsl_vector * dx,
76 double * pred, void * vstate);
77 void (*free) (void * vstate);
78 } gsl_multifit_nlinear_trs;
80 /* scaling matrix specification */
84 int (*init) (const gsl_matrix * J, gsl_vector * diag);
85 int (*update) (const gsl_matrix * J, gsl_vector * diag);
86 } gsl_multifit_nlinear_scale;
89 * linear least squares solvers - there are three steps to
90 * solving a least squares problem using a trust region
93 * 1. init: called once per iteration when a new Jacobian matrix
94 * is computed; perform factorization of Jacobian (qr,svd)
95 * or form normal equations matrix (cholesky)
96 * 2. presolve: called each time a new LM parameter value mu is available;
97 * used for cholesky method in order to factor
98 * the (J^T J + mu D^T D) matrix
99 * 3. solve: solve the least square system for a given rhs
104 void * (*alloc) (const size_t n, const size_t p);
105 int (*init) (const void * vtrust_state, void * vstate);
106 int (*presolve) (const double mu, const void * vtrust_state, void * vstate);
107 int (*solve) (const gsl_vector * f, gsl_vector * x,
108 const void * vtrust_state, void * vstate);
109 int (*rcond) (double * rcond, void * vstate);
110 void (*free) (void * vstate);
111 } gsl_multifit_nlinear_solver;
113 /* tunable parameters */
116 const gsl_multifit_nlinear_trs *trs; /* trust region subproblem method */
117 const gsl_multifit_nlinear_scale *scale; /* scaling method */
118 const gsl_multifit_nlinear_solver *solver; /* solver method */
119 gsl_multifit_nlinear_fdtype fdtype; /* finite difference method */
120 double factor_up; /* factor for increasing trust radius */
121 double factor_down; /* factor for decreasing trust radius */
122 double avmax; /* max allowed |a|/|v| */
123 double h_df; /* step size for finite difference Jacobian */
124 double h_fvv; /* step size for finite difference fvv */
125 } gsl_multifit_nlinear_parameters;
130 void * (*alloc) (const gsl_multifit_nlinear_parameters * params,
131 const size_t n, const size_t p);
132 int (*init) (void * state, const gsl_vector * wts,
133 gsl_multifit_nlinear_fdf * fdf, const gsl_vector * x,
134 gsl_vector * f, gsl_matrix * J, gsl_vector * g);
135 int (*iterate) (void * state, const gsl_vector * wts,
136 gsl_multifit_nlinear_fdf * fdf, gsl_vector * x,
137 gsl_vector * f, gsl_matrix * J, gsl_vector * g,
139 int (*rcond) (double * rcond, void * state);
140 double (*avratio) (void * state);
141 void (*free) (void * state);
142 } gsl_multifit_nlinear_type;
144 /* current state passed to low-level trust region algorithms */
147 const gsl_vector * x; /* parameter values x */
148 const gsl_vector * f; /* residual vector f(x) */
149 const gsl_vector * g; /* gradient J^T f */
150 const gsl_matrix * J; /* Jacobian J(x) */
151 const gsl_vector * diag; /* scaling matrix D */
152 const gsl_vector * sqrt_wts; /* sqrt(diag(W)) or NULL for unweighted */
153 const double *mu; /* LM parameter */
154 const gsl_multifit_nlinear_parameters * params;
155 void *solver_state; /* workspace for linear least squares solver */
156 gsl_multifit_nlinear_fdf * fdf;
157 double *avratio; /* |a| / |v| */
158 } gsl_multifit_nlinear_trust_state;
162 const gsl_multifit_nlinear_type * type;
163 gsl_multifit_nlinear_fdf * fdf ;
164 gsl_vector * x; /* parameter values x */
165 gsl_vector * f; /* residual vector f(x) */
166 gsl_vector * dx; /* step dx */
167 gsl_vector * g; /* gradient J^T f */
168 gsl_matrix * J; /* Jacobian J(x) */
169 gsl_vector * sqrt_wts_work; /* sqrt(W) */
170 gsl_vector * sqrt_wts; /* ptr to sqrt_wts_work, or NULL if not using weights */
171 size_t niter; /* number of iterations performed */
172 gsl_multifit_nlinear_parameters params;
174 } gsl_multifit_nlinear_workspace;
176 gsl_multifit_nlinear_workspace *
177 gsl_multifit_nlinear_alloc (const gsl_multifit_nlinear_type * T,
178 const gsl_multifit_nlinear_parameters * params,
181 void gsl_multifit_nlinear_free (gsl_multifit_nlinear_workspace * w);
183 gsl_multifit_nlinear_parameters gsl_multifit_nlinear_default_parameters(void);
186 gsl_multifit_nlinear_init (const gsl_vector * x,
187 gsl_multifit_nlinear_fdf * fdf,
188 gsl_multifit_nlinear_workspace * w);
190 int gsl_multifit_nlinear_winit (const gsl_vector * x,
191 const gsl_vector * wts,
192 gsl_multifit_nlinear_fdf * fdf,
193 gsl_multifit_nlinear_workspace * w);
196 gsl_multifit_nlinear_iterate (gsl_multifit_nlinear_workspace * w);
199 gsl_multifit_nlinear_avratio (const gsl_multifit_nlinear_workspace * w);
202 gsl_multifit_nlinear_driver (const size_t maxiter,
206 void (*callback)(const size_t iter, void *params,
207 const gsl_multifit_nlinear_workspace *w),
208 void *callback_params,
210 gsl_multifit_nlinear_workspace * w);
213 gsl_multifit_nlinear_jac (const gsl_multifit_nlinear_workspace * w);
216 gsl_multifit_nlinear_name (const gsl_multifit_nlinear_workspace * w);
219 gsl_multifit_nlinear_position (const gsl_multifit_nlinear_workspace * w);
222 gsl_multifit_nlinear_residual (const gsl_multifit_nlinear_workspace * w);
225 gsl_multifit_nlinear_niter (const gsl_multifit_nlinear_workspace * w);
228 gsl_multifit_nlinear_rcond (double *rcond, const gsl_multifit_nlinear_workspace * w);
231 gsl_multifit_nlinear_trs_name (const gsl_multifit_nlinear_workspace * w);
233 int gsl_multifit_nlinear_eval_f(gsl_multifit_nlinear_fdf *fdf,
235 const gsl_vector *swts,
238 int gsl_multifit_nlinear_eval_df(const gsl_vector *x,
240 const gsl_vector *swts,
242 const gsl_multifit_nlinear_fdtype fdtype,
243 gsl_multifit_nlinear_fdf *fdf,
244 gsl_matrix *df, gsl_vector *work);
247 gsl_multifit_nlinear_eval_fvv(const double h,
252 const gsl_vector *swts,
253 gsl_multifit_nlinear_fdf *fdf,
254 gsl_vector *yvv, gsl_vector *work);
258 gsl_multifit_nlinear_covar (const gsl_matrix * J, const double epsrel,
263 gsl_multifit_nlinear_test (const double xtol, const double gtol,
264 const double ftol, int *info,
265 const gsl_multifit_nlinear_workspace * w);
269 gsl_multifit_nlinear_df(const double h, const gsl_multifit_nlinear_fdtype fdtype,
270 const gsl_vector *x, const gsl_vector *wts,
271 gsl_multifit_nlinear_fdf *fdf,
272 const gsl_vector *f, gsl_matrix *J, gsl_vector *work);
276 gsl_multifit_nlinear_fdfvv(const double h, const gsl_vector *x, const gsl_vector *v,
277 const gsl_vector *f, const gsl_matrix *J,
278 const gsl_vector *swts, gsl_multifit_nlinear_fdf *fdf,
279 gsl_vector *fvv, gsl_vector *work);
281 /* top-level algorithms */
282 GSL_VAR const gsl_multifit_nlinear_type * gsl_multifit_nlinear_trust;
284 /* trust region subproblem methods */
285 GSL_VAR const gsl_multifit_nlinear_trs * gsl_multifit_nlinear_trs_lm;
286 GSL_VAR const gsl_multifit_nlinear_trs * gsl_multifit_nlinear_trs_lmaccel;
287 GSL_VAR const gsl_multifit_nlinear_trs * gsl_multifit_nlinear_trs_dogleg;
288 GSL_VAR const gsl_multifit_nlinear_trs * gsl_multifit_nlinear_trs_ddogleg;
289 GSL_VAR const gsl_multifit_nlinear_trs * gsl_multifit_nlinear_trs_subspace2D;
291 /* scaling matrix strategies */
292 GSL_VAR const gsl_multifit_nlinear_scale * gsl_multifit_nlinear_scale_levenberg;
293 GSL_VAR const gsl_multifit_nlinear_scale * gsl_multifit_nlinear_scale_marquardt;
294 GSL_VAR const gsl_multifit_nlinear_scale * gsl_multifit_nlinear_scale_more;
297 GSL_VAR const gsl_multifit_nlinear_solver * gsl_multifit_nlinear_solver_cholesky;
298 GSL_VAR const gsl_multifit_nlinear_solver * gsl_multifit_nlinear_solver_mcholesky;
299 GSL_VAR const gsl_multifit_nlinear_solver * gsl_multifit_nlinear_solver_qr;
300 GSL_VAR const gsl_multifit_nlinear_solver * gsl_multifit_nlinear_solver_svd;
304 #endif /* __GSL_MULTIFIT_NLINEAR_H__ */