Simulink block error. "Invalid sizes vector returned by MEX S-function"

Sorry for the lack of information in this question. Doing research for someone and I've been given a huge amount of files to get running on Matlab.

The project I'm trying to run is a very detailed Simulink model. In the model, I am trying to run an S-function on my MEX file Core_Neutronics. The mex file I got was outdated. Had to convert it to .mexw64 first, which I'm pretty sure I did successfully by using the following code (filename was Core_Neutronics.c):

--------------

#include "mex.h"

    /*
     * Core_Neutronics.c
     * This is a MEX-file for MATLAB.
     */

    /*computation*/

void
mexFunction(int nlhs,mxArray *plhs[],int nrhs,const mxArray *prhs[])
{
    int        i;

      /* Examine input (right-hand-side) arguments. */
      mexPrintf("\nThere are %d right-hand-side argument(s).", nrhs);
      for (i=0; i<nrhs; i++)  {
          mexPrintf("\n\tInput Arg %i is of type:\t%s ",i,mxGetClassName(prhs[i]));
      }

      /* Examine output (left-hand-side) arguments. */
      mexPrintf("\n\nThere are %d left-hand-side argument(s).\n", nlhs);
      if (nlhs > nrhs)
        mexErrMsgIdAndTxt( "MATLAB:mexfunction:inputOutputMismatch",
                "Cannot specify more outputs than inputs.\n");

      for (i=0; i<nlhs; i++)  {
          plhs[i]=mxCreateDoubleMatrix(1,1,mxREAL);
          *mxGetPr(plhs[i])=(double)mxGetNumberOfElements(prhs[i]);
      }
  }

Then I set my MATLAB compiler to Visual Studio 12, and ran

mex Core_Neutronics.c

So I went ahead and tried to run Simulink again, but now I get an error that reads

Invalid sizes vector returned by MEX S-function 'Core_Neutronics' in 'Panther/PRX_Subsystem/S-Function'

Does anyone know why this is happening? I don't know that much about MATLAB. I do know that all of the variables coming out of my Core_Neutronics program are all 'double'.

Any help would be appreciated. Can't find anything on this error online.

Ryan

Answer 1

[Kaustubha Govind]

What you have is a MEX-function meant for execution in MATLAB. You can run it like any other MATLAB function. An S-function looks like this: Basic C MEX S-Function. If you need to run MATLAB code in Simulink, you can one of three MATLAB Function blocks.