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<title>Initializing the Nonlinear Least-Squares Solver - GNU Scientific Library -- Reference Manual</title>
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<h3 class="section">38.2 Initializing the Solver</h3>
<div class="defun">
— Function: gsl_multifit_fsolver * <b>gsl_multifit_fsolver_alloc</b> (<var>const gsl_multifit_fsolver_type * T, size_t n, size_t p</var>)<var><a name="index-gsl_005fmultifit_005ffsolver_005falloc-2594"></a></var><br>
<blockquote><p><a name="index-gsl_005fmultifit_005ffsolver-2595"></a><a name="index-gsl_005fmultifit_005ffsolver_005ftype-2596"></a>This function returns a pointer to a newly allocated instance of a
solver of type <var>T</var> for <var>n</var> observations and <var>p</var> parameters.
The number of observations <var>n</var> must be greater than or equal to
parameters <var>p</var>.
<p>If there is insufficient memory to create the solver then the function
returns a null pointer and the error handler is invoked with an error
code of <code>GSL_ENOMEM</code>.
</p></blockquote></div>
<div class="defun">
— Function: gsl_multifit_fdfsolver * <b>gsl_multifit_fdfsolver_alloc</b> (<var>const gsl_multifit_fdfsolver_type * T, size_t n, size_t p</var>)<var><a name="index-gsl_005fmultifit_005ffdfsolver_005falloc-2597"></a></var><br>
<blockquote><p><a name="index-gsl_005fmultifit_005ffdfsolver-2598"></a><a name="index-gsl_005fmultifit_005ffdfsolver_005ftype-2599"></a>This function returns a pointer to a newly allocated instance of a
derivative solver of type <var>T</var> for <var>n</var> observations and <var>p</var>
parameters. For example, the following code creates an instance of a
Levenberg-Marquardt solver for 100 data points and 3 parameters,
<pre class="example"> const gsl_multifit_fdfsolver_type * T
= gsl_multifit_fdfsolver_lmder;
gsl_multifit_fdfsolver * s
= gsl_multifit_fdfsolver_alloc (T, 100, 3);
</pre>
<p class="noindent">The number of observations <var>n</var> must be greater than or equal to
parameters <var>p</var>.
<p>If there is insufficient memory to create the solver then the function
returns a null pointer and the error handler is invoked with an error
code of <code>GSL_ENOMEM</code>.
</p></blockquote></div>
<div class="defun">
— Function: int <b>gsl_multifit_fsolver_set</b> (<var>gsl_multifit_fsolver * s, gsl_multifit_function * f, const gsl_vector * x</var>)<var><a name="index-gsl_005fmultifit_005ffsolver_005fset-2600"></a></var><br>
<blockquote><p>This function initializes, or reinitializes, an existing solver <var>s</var>
to use the function <var>f</var> and the initial guess <var>x</var>.
</p></blockquote></div>
<div class="defun">
— Function: int <b>gsl_multifit_fdfsolver_set</b> (<var>gsl_multifit_fdfsolver * s, gsl_multifit_function_fdf * fdf, const gsl_vector * x</var>)<var><a name="index-gsl_005fmultifit_005ffdfsolver_005fset-2601"></a></var><br>
<blockquote><p>This function initializes, or reinitializes, an existing solver <var>s</var>
to use the function and derivative <var>fdf</var> and the initial guess
<var>x</var>.
</p></blockquote></div>
<div class="defun">
— Function: void <b>gsl_multifit_fsolver_free</b> (<var>gsl_multifit_fsolver * s</var>)<var><a name="index-gsl_005fmultifit_005ffsolver_005ffree-2602"></a></var><br>
— Function: void <b>gsl_multifit_fdfsolver_free</b> (<var>gsl_multifit_fdfsolver * s</var>)<var><a name="index-gsl_005fmultifit_005ffdfsolver_005ffree-2603"></a></var><br>
<blockquote><p>These functions free all the memory associated with the solver <var>s</var>.
</p></blockquote></div>
<div class="defun">
— Function: const char * <b>gsl_multifit_fsolver_name</b> (<var>const gsl_multifit_fsolver * s</var>)<var><a name="index-gsl_005fmultifit_005ffsolver_005fname-2604"></a></var><br>
— Function: const char * <b>gsl_multifit_fdfsolver_name</b> (<var>const gsl_multifit_fdfsolver * s</var>)<var><a name="index-gsl_005fmultifit_005ffdfsolver_005fname-2605"></a></var><br>
<blockquote><p>These functions return a pointer to the name of the solver. For example,
<pre class="example"> printf ("s is a '%s' solver\n",
gsl_multifit_fdfsolver_name (s));
</pre>
<p class="noindent">would print something like <code>s is a 'lmder' solver</code>.
</p></blockquote></div>
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