MATLAB: Error when m-file calls cpp-file

error

I have a folder that implements the Bayesian Color Constancy, and it contains .m files and .cpp files. When some .m file calls a .cpp file, MATLAB yields: ??? Undefined function or method ‹The functions' name› for input arguments of type ‹double›. although I have everything in path.

Do i need to install something special in order to make MATLAB recognize this file?

Best Answer

You cannot call directly cpp files from Matlab. You need to use mex to compile cpp file into a format that Matlab can understand.

 doc mex

Once it is compiled you can call it directly from Matlab. As it stands, what the error message is telling you is that there is no function with that name that Matlab understand. The file might very well be there, but it is not possible to read it.

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Your main problem is that you need to create the output array PLHS(1) before you access it. Also your NLHS and NRHS types are wrong. Try this:

#include <fintrf.h>
C
C Gateway routine
C
    SUBROUTINE MEXFUNCTION(NLHS, PLHS, NRHS, PRHS)
    implicit none
C mexFunction arguments:
    MWPOINTER PLHS(*), PRHS(*)
    INTEGER NLHS, NRHS
    mwPointer, external :: mxGetPr, mxGetPi
    mwPointer, external :: mxCreateDoubleMatrix, mxCreateNumericArray
    mwSize, external :: mxGetM, mxGetN
    MWPOINTER YPP 
    mwSize M, N
    integer*4 ComplexFlag
    REAL *8 RYPP(1)
    RYPP(1) = 10
    M = 1
    N = 1
    ComplexFlag = 0
    PLHS(1) = mxCreateDoubleMatrix( M, N, ComplexFlag )
    YPP = MXGETPR(PLHS(1))
    CALL MXCOPYREAL8TOPTR(RYPP, YPP, M*N)
    RETURN
    END

Best Answer

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MATLAB: C-Mex Error: expected “…” or “,”

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