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<h2 class="chapter">9 Handling of structures of optimized parameters</h2>
<p><a name="index-parameter-structures-95"></a>
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>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>If the initial parameters are a structure, the parameters being the
optimization result will also be returned as a structure.
<ul class="menu">
<li><a accesskey="1" href="Structure_002dbased-user-functions.html#Structure_002dbased-user-functions">Structure-based user functions</a>: Specify which user functions accept
parameter structures.
<li><a accesskey="2" href="Structure_002dbased-gradients-and-Hessians.html#Structure_002dbased-gradients-and-Hessians">Structure-based gradients and Hessians</a>: Format of returned values of
structure-based gradient and Hessian functions.
<li><a accesskey="3" href="Structure_002dbased-linear-constraints.html#Structure_002dbased-linear-constraints">Structure-based linear constraints</a>: Specify structure-based linear
constraints.
<li><a accesskey="4" href="Structure_002dbased-configuration-settings.html#Structure_002dbased-configuration-settings">Structure-based configuration settings</a>: Parameter-related
configuration settings in structure form.
<li><a accesskey="5" href="Non_002dscalar-parameters.html#Non_002dscalar-parameters">Non-scalar parameters</a>: Handling named parameter arrays.
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