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<title>Initializing the Minimizer - GNU Scientific Library -- Reference Manual</title>
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<a name="Initializing-the-Minimizer"></a>
Next: <a rel="next" accesskey="n" href="Providing-the-function-to-minimize.html">Providing the function to minimize</a>,
Previous: <a rel="previous" accesskey="p" href="Minimization-Caveats.html">Minimization Caveats</a>,
Up: <a rel="up" accesskey="u" href="One-dimensional-Minimization.html">One dimensional Minimization</a>
<hr>
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<h3 class="section">33.3 Initializing the Minimizer</h3>
<div class="defun">
— Function: gsl_min_fminimizer * <b>gsl_min_fminimizer_alloc</b> (<var>const gsl_min_fminimizer_type * T</var>)<var><a name="index-gsl_005fmin_005ffminimizer_005falloc-2256"></a></var><br>
<blockquote><p>This function returns a pointer to a newly allocated instance of a
minimizer of type <var>T</var>. For example, the following code
creates an instance of a golden section minimizer,
<pre class="example"> const gsl_min_fminimizer_type * T
= gsl_min_fminimizer_goldensection;
gsl_min_fminimizer * s
= gsl_min_fminimizer_alloc (T);
</pre>
<p>If there is insufficient memory to create the minimizer 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_min_fminimizer_set</b> (<var>gsl_min_fminimizer * s, gsl_function * f, double x_minimum, double x_lower, double x_upper</var>)<var><a name="index-gsl_005fmin_005ffminimizer_005fset-2257"></a></var><br>
<blockquote><p>This function sets, or resets, an existing minimizer <var>s</var> to use the
function <var>f</var> and the initial search interval [<var>x_lower</var>,
<var>x_upper</var>], with a guess for the location of the minimum
<var>x_minimum</var>.
<p>If the interval given does not contain a minimum, then the function
returns an error code of <code>GSL_EINVAL</code>.
</p></blockquote></div>
<div class="defun">
— Function: int <b>gsl_min_fminimizer_set_with_values</b> (<var>gsl_min_fminimizer * s, gsl_function * f, double x_minimum, double f_minimum, double x_lower, double f_lower, double x_upper, double f_upper</var>)<var><a name="index-gsl_005fmin_005ffminimizer_005fset_005fwith_005fvalues-2258"></a></var><br>
<blockquote><p>This function is equivalent to <code>gsl_min_fminimizer_set</code> but uses
the values <var>f_minimum</var>, <var>f_lower</var> and <var>f_upper</var> instead of
computing <code>f(x_minimum)</code>, <code>f(x_lower)</code> and <code>f(x_upper)</code>.
</p></blockquote></div>
<div class="defun">
— Function: void <b>gsl_min_fminimizer_free</b> (<var>gsl_min_fminimizer * s</var>)<var><a name="index-gsl_005fmin_005ffminimizer_005ffree-2259"></a></var><br>
<blockquote><p>This function frees all the memory associated with the minimizer
<var>s</var>.
</p></blockquote></div>
<div class="defun">
— Function: const char * <b>gsl_min_fminimizer_name</b> (<var>const gsl_min_fminimizer * s</var>)<var><a name="index-gsl_005fmin_005ffminimizer_005fname-2260"></a></var><br>
<blockquote><p>This function returns a pointer to the name of the minimizer. For example,
<pre class="example"> printf ("s is a '%s' minimizer\n",
gsl_min_fminimizer_name (s));
</pre>
<p class="noindent">would print something like <code>s is a 'brent' minimizer</code>.
</p></blockquote></div>
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