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82 lines
3.3 KiB
C
82 lines
3.3 KiB
C
/*
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* Library: lmfit (Levenberg-Marquardt least squares fitting)
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*
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* File: lmstruct.h
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*
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* Contents: Declarations of parameter records, used in lmmin.h and lmcurve.h
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*
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* Copyright: Joachim Wuttke, Forschungszentrum Juelich GmbH (2004-2013)
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*
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* License: see ../COPYING (FreeBSD)
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*
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* Homepage: apps.jcns.fz-juelich.de/lmfit
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*/
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#ifndef LMSTRUCT_H
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#define LMSTRUCT_H
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#undef __BEGIN_DECLS
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#undef __END_DECLS
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#ifdef __cplusplus
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#define __BEGIN_DECLS extern "C" {
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#define __END_DECLS }
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#else
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#define __BEGIN_DECLS /* empty */
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#define __END_DECLS /* empty */
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#endif
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__BEGIN_DECLS
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#include <stdio.h>
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/* Collection of input parameters for fit control. */
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typedef struct {
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double ftol; /* Relative error desired in the sum of squares.
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Termination occurs when both the actual and
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predicted relative reductions in the sum of squares
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are at most ftol. */
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double xtol; /* Relative error between last two approximations.
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Termination occurs when the relative error between
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two consecutive iterates is at most xtol. */
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double gtol; /* Orthogonality desired between fvec and its derivs.
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Termination occurs when the cosine of the angle
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between fvec and any column of the Jacobian is at
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most gtol in absolute value. */
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double epsilon; /* Step used to calculate the Jacobian, should be
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slightly larger than the relative error in the
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user-supplied functions. */
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double stepbound; /* Used in determining the initial step bound. This
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bound is set to the product of stepbound and the
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Euclidean norm of diag*x if nonzero, or else to
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stepbound itself. In most cases stepbound should lie
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in the interval (0.1,100.0). Generally, the value
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100.0 is recommended. */
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int patience; /* Used to set the maximum number of function evaluations
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to patience*(number_of_parameters+1). */
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int scale_diag; /* If 1, the variables will be rescaled internally.
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Recommended value is 1. */
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FILE* msgfile; /* Progress messages will be written to this file. */
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int verbosity; /* OR'ed: 1: print some messages; 2: print Jacobian. */
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int n_maxpri; /* -1, or max number of parameters to print. */
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int m_maxpri; /* -1, or max number of residuals to print. */
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} lm_control_struct;
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/* Collection of output parameters for status info. */
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typedef struct {
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double fnorm; /* norm of the residue vector fvec. */
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int nfev; /* actual number of iterations. */
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int outcome; /* Status indicator. Nonnegative values are used as index
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for the message text lm_infmsg, set in lmmin.c. */
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int userbreak; /* Set when function evaluation requests termination. */
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} lm_status_struct;
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/* Preset (and recommended) control parameter settings. */
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extern const lm_control_struct lm_control_double;
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extern const lm_control_struct lm_control_float;
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/* Preset message texts. */
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extern const char* lm_infmsg[];
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extern const char* lm_shortmsg[];
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__END_DECLS
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#endif /* LMSTRUCT_H */
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