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<a name="Parameter-structures"></a>
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Next: <a href="Additional-parameters.html#Additional-parameters" accesskey="n" rel="next">Additional parameters</a>, Previous: <a href="Common-optimization-options.html#Common-optimization-options" accesskey="p" rel="prev">Common optimization options</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> [<a href="Function-index.html#Function-index" title="Index" rel="index">Index</a>]</p>
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<a name="Handling-of-structures-of-optimized-parameters"></a>
<h2 class="chapter">10 Handling of structures of optimized parameters</h2>
<a name="index-parameter-structures"></a>
<p>It can be convenient not to handle the optimized parameters as elements
of a vector, but as named fields of a structure. The frontends
<code>nonlin_residmin</code>, <code>nonlin_curvefit</code>, <code>residmin_stat</code>,
<code>curvefit_stat</code>, and <code>nonlin_min</code> can accept parameter
information in structure form, and can pass the parameters as a
structure to user functions, although the backends still handle the
parameters as vectors.
</p>
<p>To use this feature, the initial parameters must be given in structure
form, or the setting <code>param_order</code> must be given, a cell-array with
names of the parameters. If both is done, only the parameters in
structure fields named in <code>param_order</code> will be optimized. If
there are still some non-structure-based configuration settings or user
functions, specifying <code>param_order</code> is mandatory even if the
initial parameters are given in structure form.
</p>
<p>If the initial parameters are a structure, the parameters being the
optimization result will also be returned as a structure.
</p>
<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top">• <a href="Structure_002dbased-user-functions.html#Structure_002dbased-user-functions" accesskey="1">Structure-based user functions</a>:</td><td> </td><td align="left" valign="top">Specify which user functions accept
parameter structures.
</td></tr>
<tr><td align="left" valign="top">• <a href="Structure_002dbased-gradients-and-Hessians.html#Structure_002dbased-gradients-and-Hessians" accesskey="2">Structure-based gradients and Hessians</a>:</td><td> </td><td align="left" valign="top">Format of returned values of
structure-based gradient and Hessian functions.
</td></tr>
<tr><td align="left" valign="top">• <a href="Structure_002dbased-linear-constraints.html#Structure_002dbased-linear-constraints" accesskey="3">Structure-based linear constraints</a>:</td><td> </td><td align="left" valign="top">Specify structure-based linear
constraints.
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<tr><td align="left" valign="top">• <a href="Structure_002dbased-configuration-settings.html#Structure_002dbased-configuration-settings" accesskey="4">Structure-based configuration settings</a>:</td><td> </td><td align="left" valign="top">Parameter-related
configuration settings in structure form.
</td></tr>
<tr><td align="left" valign="top">• <a href="Non_002dscalar-parameters.html#Non_002dscalar-parameters" accesskey="5">Non-scalar parameters</a>:</td><td> </td><td align="left" valign="top">Handling named parameter arrays.
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