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<h4 class="subsection">11.7.3 Private Functions</h4>
<p>In many cases one function needs to access one or more helper
functions. If the helper function is limited to the scope of a single
function, then subfunctions as discussed above might be used. However,
if a single helper function is used by more than one function, then
this is no longer possible. In this case the helper functions might
be placed in a subdirectory, called "private", of the directory in which
the functions needing access to this helper function are found.
<p>As a simple example, consider a function <code>func1</code>, that calls a helper
function <code>func2</code> to do much of the work. For example
<pre class="example"> function y = func1 (x)
y = func2 (x);
endfunction
</pre>
<p class="noindent">Then if the path to <code>func1</code> is <code><directory>/func1.m</code>, and if
<code>func2</code> is found in the directory <code><directory>/private/func2.m</code>,
then <code>func2</code> is only available for use of the functions, like
<code>func1</code>, that are found in <code><directory></code>.
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