MATLAB: How to run mexFunction

running mexfunction

Hi there, this is my first post. I have a question in regards to running a C++ program from a Matlab GUI. I have spent hours looking through information online and I understand the method that is described is using MEX files. However, all of the tutorials and example I have found, including on the Mathworks site, are for relatively short C++ functions.

So, my question is: how do I get Matlab to run a large C++ program? It has about 20 cpp files which call upon each other to run the program. There is one Main function which then runs the entire program but I don't believe its enough just converting the main function, correct me if I'm wrong. Must I copy all of those files into Matlab and turn them all into MEX functions? That doesn't sound efficient to me but I am a novice in this field.

Best Answer

Just transform the one "main" function into a mexFunction. Then that will call all the underlying C++ functions. There is only one mexFunction ... your converted "main" function. The others are not mexFunctions per se, they are simply supporting code for your one mexFunction. To compile, be sure to include all source code .cpp files on the mex command line (do not put anything on the command line that is #include in your files such as header files). E.g., for 20 files you would have something like this:

> mex mymain.cpp source2.cpp source3.cpp source4.cpp ... source20.cpp

Where the ... are actually replaced by all the file names. I.e., list all the files on one line. Also, be sure your current default directory is the directory that has all your source code and header files. If you have any library files then include them on your mex command line along with the source code files.

Related Solutions

MATLAB: Help with creating a MEX file in MATLAB from multiple C++ Source codes

All MEX-functions need to have an entry-point named mexFunction with a specific prototype. I would recommend that you read the section Creating a Source MEX-File to help you get started.

MATLAB: Do I receive a “LINK : error LNK2001: unresolved external symbol mexFunction” error when I attempt to mex a C++ source file using MATLAB 7.8 (R2009a)

The error received is a linker error which indicates that the C++ source file that is being MEXed does not contain the MEX gateway function "mexFunction".

To create a MEX file using source code that is present in multiple source files, provide all the source files as input to the MEX function. For example, if you have the following source files:

 fileContaininingMEXGateway.cpp
 sourceFile1.cpp
 sourcefile2.cpp

the MEX command to be used to create a a MEX file is shown below:

mex -v fileContaininingMEXGateway.cpp sourceFile1.cpp sourcefile2.cpp

Best Answer

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MATLAB: Help with creating a MEX file in MATLAB from multiple C++ Source codes

MATLAB: Do I receive a “LINK : error LNK2001: unresolved external symbol mexFunction” error when I attempt to mex a C++ source file using MATLAB 7.8 (R2009a)

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