MATLAB: How to convert to Mex from Cpp using Xcode ver 10

conversioncppiosmacmexxcode

For Mac Users, I need that info. Thanks

Best Answer

Your SegmentBoneDP.cpp file is the source code.

If you need something that converts C++ code into MATLAB code, then you are using the wrong product family. There is no known program that converts C++ code into MATLAB code.

"The point is that I don't know the number and type of inputs the function requires since I cannot open it to see it. "

You read them out of the C++ source code.

    Bness = (double *)mxGetData(prhs[0]);
    double *pF0,*pF1,*pBth,*pJumpConst;
    pF0 = (double *)mxGetData(prhs[1]);
    pF1 = (double *)mxGetData(prhs[2]);
    pBth = (double *)mxGetData(prhs[3]);
    pJumpConst = (double *)mxGetData(prhs[4]);

The first parameter is Bness, and is a 2D double array.

The second parameter is F0, and it is a double scalar. It appears to be used as a weight or smoothing factor

The third parameter is F1, and it is a double scalar. It appears to be used as a weight or smoothing factor

The fourth parameter is Bth, and it is a double scalar. It is a threshold between bone and no bone.

The fifth parameter is JumpConst, and it is a double scalar. It appears to be some kind of penalty for moving from bone to no bone.

The output is an array the same size as Bness, and it is a real double 2D array.

Related Solutions

MATLAB: Cpp to Mex conversion

Looks like you have a mismatch with variable types, probably an older piece of code that you are trying to compile on a newer MATLAB version. E.g., the code probably has this definition:

const int *DimsBness;

when it should be this:

const mwSize *DimsBness;

And you probably have something like this:

const int *dims;

or this

int dims[] = {2,3}; /* or whatever */

when it should be this:

const mwSize *dims;

or this

mwSize dims[] = {2,3}; /* or whatever */

Simply update the code with the required types to fix these errors.

MATLAB: How to use mxCreateNumericArray

This line is incorrect (wrong function and signature):

plhs[0]    = mxCreateNumericArray(xynum,1,mxINT16_CLASS); /*Creates a matrix*/

It should be this instead:

plhs[0]    = mxCreateNumericMatrix(xynum,1,mxINT16_CLASS,mxREAL); /*Creates a matrix*/

Also, these lines will not work:

    int gnum, xynum, *gn;
        :
    gn         = mxGetInt16s(plhs[0]);                        /*Set to be the first of the output values*/

An int on your system is almost surely a 32-bit integer, not a 16-bit integer. You need to make sure your pointer definition matches exactly what is in memory. E.g., you can probably use a short int for this:

    int gnum, xynum;
    short *gn;
        :
    gn         = mxGetInt16s(plhs[0]);                        /*Set to be the first of the output values*/

That will mean you need to change this signature:

    void findnegs(double *phi, int gnum, int xynum, int *gn, double *adj, double *newphi, double *dphidtSum)

to this instead also:

    void findnegs(double *phi, int gnum, int xynum, short *gn, double *adj, double *newphi, double *dphidtSum)

But this begs the question, are integer calculations in the findnegs function now going to overflow your 16-bit integers in gn? You may need to adjust your code to make sure this isn't a problem.

Best Answer

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MATLAB: Cpp to Mex conversion

MATLAB: How to use mxCreateNumericArray

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