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<h4 class="subsubsection">1.3.5.1 A Sample Function Description</h4>
<a name="index-function-descriptions"></a>

<p>In a function description, the name of the function being described
appears first.  It is followed on the same line by a list of parameters.
The names used for the parameters are also used in the body of the
description.
</p>
<p>After all of the calling forms have been enumerated, the next line is a
concise one-sentence summary of the function.
</p>
<p>After the summary there may be documentation on the inputs and outputs,
examples of function usage, notes about the algorithm used, and references
to related functions.
</p>
<p>Here is a description of an imaginary function <code>foo</code>:
</p>
<dl>
<dt><a name="index-foo"></a>: <em></em> <strong>foo</strong> <em>(<var>x</var>)</em></dt>
<dt><a name="index-foo-1"></a>: <em></em> <strong>foo</strong> <em>(<var>x</var>, <var>y</var>)</em></dt>
<dt><a name="index-foo-2"></a>: <em></em> <strong>foo</strong> <em>(<var>x</var>, <var>y</var>, &hellip;)</em></dt>
<dd><p>Subtract <var>x</var> from <var>y</var>, then add any remaining arguments to the
result.
</p>
<p>The input <var>x</var> must be a numeric scalar, vector, or array.
</p>
<p>The optional input <var>y</var> defaults to 19 if it is not supplied.
</p>
<p>Example:
</p>
<div class="example">
<pre class="example">foo (1, [3, 5], 3, 9)
     &rArr; [ 14, 16 ]
foo (5)
     &rArr; 14
</pre></div>

<p>More generally,
</p>
<div class="example">
<pre class="example">foo (<var>w</var>, <var>x</var>, <var>y</var>, &hellip;)
&equiv;
<var>x</var> - <var>w</var> + <var>y</var> + &hellip;
</pre></div>

<p><b>See also:</b> bar
</p></dd></dl>

<p>Any parameter whose name contains the name of a type (e.g.,
<var>integer</var> or <var>matrix</var>) is expected to be of that
type.  Parameters named <var>object</var> may be of any type.  Parameters
with other sorts of names (e.g., <var>new_file</var>) are discussed
specifically in the description of the function.  In some sections,
features common to parameters of several functions are described at the
beginning.
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