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<h2 class="chapter">10 Passing additional parameters to user functions</h2>
<p><a name="index-additional-parameters-103"></a>
Optimizers often require the user to supply functions (<abbr>e.g.</abbr>
objective functions, model functions, constraint functions). The
interface of these functions — arguments and returned values — is
defined by the optimizer. Often, a user function needs additional
arguments, not covered by the defined interface, which are constant
throughout the optimization. These can be supplied by wrapping the user
function into an anonymous function. See <a href="../octave/Anonymous-Functions.html#Anonymous-Functions">Anonymous Functions</a>, for further explanation and examples.
<p>There are also some older optimizers in the optim package, written when
anonymous functions were not available in Octave. Some of these offer
an interface to user functions which is itself able to pass additional
constant variables in arbitrary argument positions. Newer optimizers
should not be written this way, since this is an unnecessary
complication.
<p>Though it is possible to use global variables to pass additional data to
user functions, this is not recommended since it introduces the
possibility of name conflicts within the pool of global variables.
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