Problem with MexFunction and MexGetPr

7 views (last 30 days)
Good morning,
I can't solve the problem of assignment from incompatible pointer type for the x and y pointer. The error that develops in Matlab, could be caused by the wrong use of the mxGetPr function for the x and y matrix pointers, but I don't know how to proceed.
Someone could give me directions.
thank you.
void mexFunction( int nlhs, mxArray *plhs[],int nrhs, const mxArray*prhs[] )
{
double **x;
double *z;
double *p;
double **y;
int i = 2;
int j = 5;
plhs[0]= mxCreateDoubleMatrix((mwSize)i, (mwSize)j, mxREAL);
x = mxGetPr(prhs[0]);
z = mxGetPr(prhs[1]);
p =mxGetPr(prhs[2]);
y = mxGetPr(plhs[0]);
functionsum(y,x,z,p);
return;
}

Accepted Answer

James Tursa
James Tursa on 15 Jul 2019
Edited: James Tursa on 15 Jul 2019
Impossible to answer without seeing the code for the functionsum( ) function. Maybe you could post that? Maybe all you need to do is this (but this is just a guess w/o seeing your code):
double *x;
double *z;
double *p;
double *y;
What version of MATLAB are you using?
Btw, you don't need to explicitly cast the i and j arguments since C has automatic type promotion. This would suffice:
plhs[0]= mxCreateDoubleMatrix( i, j, mxREAL);

More Answers (0)

Categories

Find more on Write C Functions Callable from MATLAB (MEX Files) in Help Center and File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!