Using MatLab Add-in for MS Visual Studio 6

Writing the Application

Use the MFC AppWizard (exe) option to generate a Dialog Based Application and call it conv. Create a Button which will calculate the convolution of two given vectors.

Add the code below to the button's Message Handler.

//x1 and x2 are the input array to do the computation

//res will have the result, we already know that the length 

//of the convolution of 2 vectors is (length(x1)+length(x2)-1)=19

double x1[]={1,2,3,4,5,6,7,8,9,0};
double x2[]={4,5,6,7,4,5,8,9,0,7};
double res[19];

//create the arrays that will be passed to MyFunc

mxArray* In1;
mxArray* In2;
mxArray* Out;

//we make them Real and have 10 values

In1=mxCreateDoubleMatrix(1,10,mxREAL);
In2=mxCreateDoubleMatrix(1,10,mxREAL);

//this make In1=x1;In2=x2

memcpy(mxGetPr(In1),x1,10*sizeof(double));
memcpy(mxGetPr(In2),x2,10*sizeof(double));

//Call to MyFunc.m that return the convolution of In1 and In2

Out=mlfMyFunc(In1,In2);

//now we have the result(Out) in a double array 'res'

memcpy(res,mxGetPr(Out),19*sizeof(double));

//Destroy matrices

mxDestroyArray(Out);
mxDestroyArray(In1);
mxDestroyArray(In2);

Copy MyFunc.m into your VC++ project directory. Now go to the MatLab Add-in and click the .m++ (Add m-files to current project) button:

Select Windows Console Exe from the Combo Box and check Generate main file and debug mode. Press OK.

Then select the MyFunc.m file and click Open. After a while you will see new files added to your project.

Under MATLAB M-files you will see our MyFunc.m, you can even edit it from inside Visual C++. Under MATLAB C/C++ are MyFunc.c and MyFunc_main.c, generated by the MatLab Compiler. And all the headers needed by the compiler.

We can't build the app yet, we must add the following lines to convDlg.cpp:

#include "matlab.h"

#include "MyFunc.h"

Now the project should be built without any problem.   

Points of Interest

The steps described here don't include the MSChart part, you can see it from the source code, but you can see that the calculation is done by placing a  breakpoint inside the button message handler and checking the value of the res vector after the line:

memcpy(res,mxGetPr(Out),19*sizeof(double));

Well I hope this simple article be interesting for MatLab lovers, this is the first article I wrote, so I apologize if it is not clear enough. I will be glad to explain anything if you ask me. Greetings.