<html lang="en"> <head> <title>Calling Other Functions in Mex-Files - Untitled</title> <meta http-equiv="Content-Type" content="text/html"> <meta name="description" content="Untitled"> <meta name="generator" content="makeinfo 4.13"> <link title="Top" rel="start" href="index.html#Top"> <link rel="up" href="Mex_002dFiles.html#Mex_002dFiles" title="Mex-Files"> <link rel="prev" href="Sparse-Matrices-with-Mex_002dFiles.html#Sparse-Matrices-with-Mex_002dFiles" title="Sparse Matrices with Mex-Files"> <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> <meta http-equiv="Content-Style-Type" content="text/css"> <style type="text/css"><!-- pre.display { font-family:inherit } pre.format { font-family:inherit } pre.smalldisplay { font-family:inherit; font-size:smaller } pre.smallformat { font-family:inherit; font-size:smaller } pre.smallexample { font-size:smaller } pre.smalllisp { font-size:smaller } span.sc { font-variant:small-caps } span.roman { font-family:serif; font-weight:normal; } span.sansserif { font-family:sans-serif; font-weight:normal; } --></style> </head> <body> <div class="node"> <a name="Calling-Other-Functions-in-Mex-Files"></a> <a name="Calling-Other-Functions-in-Mex_002dFiles"></a> <p> Previous: <a rel="previous" accesskey="p" href="Sparse-Matrices-with-Mex_002dFiles.html#Sparse-Matrices-with-Mex_002dFiles">Sparse Matrices with Mex-Files</a>, Up: <a rel="up" accesskey="u" href="Mex_002dFiles.html#Mex_002dFiles">Mex-Files</a> <hr> </div> <h4 class="subsection">A.2.7 Calling Other Functions in Mex-Files</h4> <p>It is also possible 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 <pre class="example"><pre class="verbatim"> #include "mex.h" void mexFunction (int nlhs, mxArray* plhs[], int nrhs, const mxArray* prhs[]) { char *str; mexPrintf ("Hello, World!\n"); mexPrintf ("I have %d inputs and %d outputs\n", nrhs, nlhs); if (nrhs < 1 || ! mxIsString (prhs[0])) mexErrMsgTxt ("function name expected"); str = mxArrayToString (prhs[0]); mexPrintf ("I'm going to call the function %s\n", str); mexCallMATLAB (nlhs, plhs, nrhs-1, prhs+1, str); mxFree (str); } </pre></pre> <p>If this code is in the file <samp><span class="file">myfeval.c</span></samp>, and is compiled to <samp><span class="file">myfeval.mex</span></samp>, then an example of its use is <pre class="example"> myfeval("sin", 1) a = myfeval("sin", 1) ⇒ Hello, World! I have 2 inputs and 1 outputs I'm going to call the interpreter function sin a = 0.84147 </pre> <p>Note that it is not possible to use function handles or inline functions within a mex-file. <!-- @node Application Programming Interface for Mex-Files --> <!-- @subsection Application Programming Interface for Mex-Files --> <!-- WRITE ME, refer to mex.h and mexproto.h --> </body></html>