How do I pass a two-dimensional matrix to a shared library created using MATLAB Compiler?

I would like to pass a two-dimensional matrix to a shared library created using the MATLAB Compiler.

Answer 1

[MathWorks Support Team]

Use the mxCreateDoubleMatrix to create an empty matrix of the size you prefer and then populate the matrix.

Note that MATLAB is column major whereas 'C' is row major. Thus, you must make appropriate changes in your code.

For example, if you want to pass the following matrix to MATLAB generated shared library:

 [1 2 3

4 5 6]

you will have to create the data using a C code similar to the one shown below:

 double data[] = {1,2,3,4,5,6};

 mxArray *input;

 /* Create a 3X2 matrix instead of 2X3 matrix*/

 input = mxCreateDoubleMatrix(3,2,mxREAL); 

 /* populate it with the required data */

 memcpy( mxGetPr(input),data, sizeof(double)*6);

 /* Transpose it before passing to the library */

 input = mlfTranspose(input);