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<h4 class="subsection">11.9.1 Function Handles</h4>
<p>A function handle is a pointer to another function and is defined with
the syntax
<pre class="example"> @<var>function-name</var>
</pre>
<p class="noindent">For example
<pre class="example"> f = @sin;
</pre>
<p class="noindent">Creates a function handle called <code>f</code> that refers to the
function <code>sin</code>.
<p>Function handles are used to call other functions indirectly, or to pass
a function as an argument to another function like <code>quad</code> or
<code>fsolve</code>. For example
<pre class="example"> f = @sin;
quad (f, 0, pi)
⇒ 2
</pre>
<p>You may use <code>feval</code> to call a function using function handle, or
simply write the name of the function handle followed by an argument
list. If there are no arguments, you must use an empty argument list
‘<samp><span class="samp">()</span></samp>’. For example
<pre class="example"> f = @sin;
feval (f, pi/4)
⇒ 0.70711
f (pi/4)
⇒ 0.70711
</pre>
<!-- ov-fcn-handle.cc -->
<p><a name="doc_002dfunctions"></a>
<div class="defun">
— Built-in Function: <b>functions</b> (<var>fcn_handle</var>)<var><a name="index-functions-646"></a></var><br>
<blockquote><p>Return a struct containing information about the function handle
<var>fcn_handle</var>.
</p></blockquote></div>
<!-- ov-fcn-handle.cc -->
<p><a name="doc_002dfunc2str"></a>
<div class="defun">
— Built-in Function: <b>func2str</b> (<var>fcn_handle</var>)<var><a name="index-func2str-647"></a></var><br>
<blockquote><p>Return a string containing the name of the function referenced by
the function handle <var>fcn_handle</var>.
</p></blockquote></div>
<!-- ov-fcn-handle.cc -->
<p><a name="doc_002dstr2func"></a>
<div class="defun">
— Built-in Function: <b>str2func</b> (<var>fcn_name</var>)<var><a name="index-str2func-648"></a></var><br>
<blockquote><p>Return a function handle constructed from the string <var>fcn_name</var>.
</p></blockquote></div>
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