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<span id="Calling-Other-Functions-in-Mex_002dFiles"></span><div class="header">
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<span id="Calling-Other-Functions-in-Mex_002dFiles-1"></span><h4 class="subsection">A.2.7 Calling Other Functions in Mex-Files</h4>
<p>It is possible to call other Octave functions from within a mex-file using
<code>mexCallMATLAB</code>. An example of the use of <code>mexCallMATLAB</code> can be see
in the example below.
</p>
<div class="example">
<pre class="verbatim">#include "mex.h"
void
mexFunction (int nlhs, mxArray *plhs[],
int nrhs, const mxArray *prhs[])
{
char *str;
mexPrintf ("Starting file myfeval.mex\n");
mexPrintf ("I have %d inputs and %d outputs\n", nrhs, nlhs);
if (nrhs < 1 || ! mxIsChar (prhs[0]))
mexErrMsgTxt ("ARG1 must be a function name");
str = mxArrayToString (prhs[0]);
mexPrintf ("I'm going to call the function %s\n", str);
if (nlhs == 0)
nlhs = 1; // Octave's automatic 'ans' variable
/* Cast prhs just to get rid of 'const' qualifier and stop compile warning */
mexCallMATLAB (nlhs, plhs, nrhs-1, (mxArray**)prhs+1, str);
mxFree (str);
}
</pre></div>
<p>If this code is in the file <samp>myfeval.c</samp>, and is compiled to
<samp>myfeval.mex</samp>, then an example of its use is
</p>
<div class="example">
<pre class="example">a = myfeval ("sin", 1)
⇒ Starting file myfeval.mex
I have 2 inputs and 1 outputs
I'm going to call the interpreter function sin
a = 0.84147
</pre></div>
<p>Note that it is not possible to use function handles within a mex-file.
</p>
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