A.2.7 Calling Other Functions in Mex-Files

It is also possible call other Octave functions from within a mex-file using mexCallMATLAB. An example of the use of mexCallMATLAB can be see in the example below

     #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);
     }

     

If this code is in the file myfeval.c, and is compiled to myfeval.mex, then an example of its use is

     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

Note that it is not possible to use function handles or inline functions within a mex-file.