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<title>GNU Scientific Library – Reference Manual: Initializing the Minimizer</title>
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<a name="Initializing-the-Minimizer"></a>
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<p>
Next: <a href="Providing-the-function-to-minimize.html#Providing-the-function-to-minimize" accesskey="n" rel="next">Providing the function to minimize</a>, Previous: <a href="Minimization-Caveats.html#Minimization-Caveats" accesskey="p" rel="previous">Minimization Caveats</a>, Up: <a href="One-dimensional-Minimization.html#One-dimensional-Minimization" accesskey="u" rel="up">One dimensional Minimization</a> [<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
<a name="Initializing-the-Minimizer-1"></a>
<h3 class="section">34.3 Initializing the Minimizer</h3>
<dl>
<dt><a name="index-gsl_005fmin_005ffminimizer_005falloc"></a>Function: <em>gsl_min_fminimizer *</em> <strong>gsl_min_fminimizer_alloc</strong> <em>(const gsl_min_fminimizer_type * <var>T</var>)</em></dt>
<dd><a name="index-gsl_005fmin_005ffminimizer"></a>
<a name="index-gsl_005fmin_005ffminimizer_005ftype"></a>
<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,
</p>
<div class="example">
<pre class="example">const gsl_min_fminimizer_type * T
= gsl_min_fminimizer_goldensection;
gsl_min_fminimizer * s
= gsl_min_fminimizer_alloc (T);
</pre></div>
<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></dd></dl>
<dl>
<dt><a name="index-gsl_005fmin_005ffminimizer_005fset"></a>Function: <em>int</em> <strong>gsl_min_fminimizer_set</strong> <em>(gsl_min_fminimizer * <var>s</var>, gsl_function * <var>f</var>, double <var>x_minimum</var>, double <var>x_lower</var>, double <var>x_upper</var>)</em></dt>
<dd><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>
<p>If the interval given does not contain a minimum, then the function
returns an error code of <code>GSL_EINVAL</code>.
</p></dd></dl>
<dl>
<dt><a name="index-gsl_005fmin_005ffminimizer_005fset_005fwith_005fvalues"></a>Function: <em>int</em> <strong>gsl_min_fminimizer_set_with_values</strong> <em>(gsl_min_fminimizer * <var>s</var>, gsl_function * <var>f</var>, double <var>x_minimum</var>, double <var>f_minimum</var>, double <var>x_lower</var>, double <var>f_lower</var>, double <var>x_upper</var>, double <var>f_upper</var>)</em></dt>
<dd><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></dd></dl>
<dl>
<dt><a name="index-gsl_005fmin_005ffminimizer_005ffree"></a>Function: <em>void</em> <strong>gsl_min_fminimizer_free</strong> <em>(gsl_min_fminimizer * <var>s</var>)</em></dt>
<dd><p>This function frees all the memory associated with the minimizer
<var>s</var>.
</p></dd></dl>
<dl>
<dt><a name="index-gsl_005fmin_005ffminimizer_005fname"></a>Function: <em>const char *</em> <strong>gsl_min_fminimizer_name</strong> <em>(const gsl_min_fminimizer * <var>s</var>)</em></dt>
<dd><p>This function returns a pointer to the name of the minimizer. For example,
</p>
<div class="example">
<pre class="example">printf ("s is a '%s' minimizer\n",
gsl_min_fminimizer_name (s));
</pre></div>
<p>would print something like <code>s is a 'brent' minimizer</code>.
</p></dd></dl>
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