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<title>GNU Scientific Library &ndash; Reference Manual: Minimization Iteration</title>

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<a name="Minimization-Iteration"></a>
<div class="header">
<p>
Next: <a href="Minimization-Stopping-Parameters.html#Minimization-Stopping-Parameters" accesskey="n" rel="next">Minimization Stopping Parameters</a>, Previous: <a href="Providing-the-function-to-minimize.html#Providing-the-function-to-minimize" accesskey="p" rel="previous">Providing the function to minimize</a>, Up: <a href="One-dimensional-Minimization.html#One-dimensional-Minimization" accesskey="u" rel="up">One dimensional Minimization</a> &nbsp; [<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
<a name="Iteration-1"></a>
<h3 class="section">35.5 Iteration</h3>

<p>The following functions drive the iteration of each algorithm.  Each
function performs one iteration to update the state of any minimizer of the
corresponding type.  The same functions work for all minimizers so that
different methods can be substituted at runtime without modifications to
the code.
</p>
<dl>
<dt><a name="index-gsl_005fmin_005ffminimizer_005fiterate"></a>Function: <em>int</em> <strong>gsl_min_fminimizer_iterate</strong> <em>(gsl_min_fminimizer * <var>s</var>)</em></dt>
<dd><p>This function performs a single iteration of the minimizer <var>s</var>.  If the
iteration encounters an unexpected problem then an error code will be
returned,
</p>
<dl compact="compact">
<dt><code>GSL_EBADFUNC</code></dt>
<dd><p>the iteration encountered a singular point where the function evaluated
to <code>Inf</code> or <code>NaN</code>.
</p>
</dd>
<dt><code>GSL_FAILURE</code></dt>
<dd><p>the algorithm could not improve the current best approximation or
bounding interval.
</p></dd>
</dl>
</dd></dl>

<p>The minimizer maintains a current best estimate of the position of the
minimum at all times, and the current interval bounding the minimum.
This information can be accessed with the following auxiliary functions,
</p>
<dl>
<dt><a name="index-gsl_005fmin_005ffminimizer_005fx_005fminimum"></a>Function: <em>double</em> <strong>gsl_min_fminimizer_x_minimum</strong> <em>(const gsl_min_fminimizer * <var>s</var>)</em></dt>
<dd><p>This function returns the current estimate of the position of the
minimum for the minimizer <var>s</var>.
</p></dd></dl>

<dl>
<dt><a name="index-gsl_005fmin_005ffminimizer_005fx_005fupper"></a>Function: <em>double</em> <strong>gsl_min_fminimizer_x_upper</strong> <em>(const gsl_min_fminimizer * <var>s</var>)</em></dt>
<dt><a name="index-gsl_005fmin_005ffminimizer_005fx_005flower"></a>Function: <em>double</em> <strong>gsl_min_fminimizer_x_lower</strong> <em>(const gsl_min_fminimizer * <var>s</var>)</em></dt>
<dd><p>These functions return the current upper and lower bound of the interval
for the minimizer <var>s</var>.
</p></dd></dl>

<dl>
<dt><a name="index-gsl_005fmin_005ffminimizer_005ff_005fminimum"></a>Function: <em>double</em> <strong>gsl_min_fminimizer_f_minimum</strong> <em>(const gsl_min_fminimizer * <var>s</var>)</em></dt>
<dt><a name="index-gsl_005fmin_005ffminimizer_005ff_005fupper"></a>Function: <em>double</em> <strong>gsl_min_fminimizer_f_upper</strong> <em>(const gsl_min_fminimizer * <var>s</var>)</em></dt>
<dt><a name="index-gsl_005fmin_005ffminimizer_005ff_005flower"></a>Function: <em>double</em> <strong>gsl_min_fminimizer_f_lower</strong> <em>(const gsl_min_fminimizer * <var>s</var>)</em></dt>
<dd><p>These functions return the value of the function at the current estimate
of the minimum and at the upper and lower bounds of the interval for the
minimizer <var>s</var>.
</p></dd></dl>




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