Error when m-file calls cpp-file

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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?

Accepted Answer

José-Luis
José-Luis on 2 May 2013
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.
  3 Comments
José-Luis
José-Luis on 2 May 2013
Have you tried reading the documentation? Please type
doc mex
in the command line.
In a perfect world, if everything is already set up right:
mex your_file.cpp
should suffice, and produce a function your_file() that you can then call from Matlab.
Please accept an answer if it helps you.
Elysi Cochin
Elysi Cochin on 2 May 2013
sir i didnt understand the document much...
and in that the bayesiancc contains the cpp files i'm working on...
in the a function logp = logp_X(X,logemp,lambda)
the mex file is called...
n_k = mex_histc(X,nBins);
just before this line i added...
mex mex_histc.cpp
n_k = mex_histc(X,nBins);
but this i got error as
Error mex_histc.cpp: 17 illegal statement termination
Error mex_histc.cpp: 17 skipping `unsigned' `int'
Error mex_histc.cpp: 17 undeclared identifier `nBins'
Error mex_histc.cpp: 18 illegal statement termination
Error mex_histc.cpp: 18 skipping `double'
Error mex_histc.cpp: 18 undeclared identifier `X'
Error mex_histc.cpp: 18 type error: pointer expected
Error mex_histc.cpp: 18 operands of = have illegal types `int' and `pointer to double'
Error mex_histc.cpp: 20 illegal statement termination
Error mex_histc.cpp: 20 skipping `unsigned' `int'
Error mex_histc.cpp: 20 undeclared identifier `npts'
Error mex_histc.cpp: 21 illegal statement termination
Error mex_histc.cpp: 21 skipping `unsigned' `int'
Error mex_histc.cpp: 21 undeclared identifier `ndims'
Error mex_histc.cpp: 43 illegal use of type name `mwSize'
Warning mex_histc.cpp: 43 Statement has no effect
Error mex_histc.cpp: 43 syntax error; found `dims' expecting `;'
Error mex_histc.cpp: 43 undeclared identifier `dims'
Error mex_histc.cpp: 43 type error: pointer expected
Warning mex_histc.cpp: 43 Statement has no effect
Error mex_histc.cpp: 44 type error: pointer expected
Error mex_histc.cpp: 45 type error: pointer expected
Error mex_histc.cpp: 47 too many errors
C:\PROGRA~1\MATLAB\R2009B\BIN\MEX.PL: Error: Compile of 'mex_histc.cpp' failed.
??? Error using ==> mex at 221
Unable to complete successfully.
Error in ==> logp_X at 11
mex mex_histc.cpp
Error in ==> rosenberg at 158
logp = logp_X(X,logemp,lambda);
Error in ==> sample_run at 15
Lrb = rosenberg(I,mask,logemp);
please can you tell me what i should do?? please do reply sir....

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More Answers (1)

José-Luis
José-Luis on 2 May 2013
Are you using linux?
  2 Comments
Elysi Cochin
Elysi Cochin on 2 May 2013
no sir i'm using windows 7
José-Luis
José-Luis on 2 May 2013
Then you need to compile it. I looked at the download and a compiled linux version is provided. There is a Makefile provided to help with the dependencies or whatnot. You should probably contact the author for help if you want to do in Windows.

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