It seems that are several ways to call matlab in C C++ and to call C C++ in matlab. While I try to list them here, please point it out If I miss something.
To call C C++ in matlab, there are also two methods. The first one is to call functions in C shared libraries. The second one is to build C C++ code into binary MEX-files, which will be called from the MATLAB command line. For the first method, are the C shared libraries are just general ones, i.e. without change to their C code for matlab and compiled from general C compiler like gcc?
To call matlab code in C C++, there are two methods available. The first one is Matlab engine. The second one is to use MATLAB Compiler mcc to create C or C++ shared libraries from your MATLAB code.
Besides matlab and C C++ can communicate via writing and reading data to and from some file (e.g. mat file, text file).
Having more than one ways to accomplish each of the goals here, could you tell me what cases are best for using which of them? i.e. calling functions in C shared libraries VS building C C++ code into binary MEX-files, Matlab engine VS compiling Matlab code into C C++ shared library.
Thanks and regards!
With pass by value, C code can return only a single scalar variable. With pass by reference, C code can return multiple variables, including arrays. Consider the MATLAB function adderRef . This function uses external C code to add two arrays. The coder.
NOTE: The following are known Ctrl+C behaviors in specific versions of MATLAB for Windows. In general, when you use Ctrl+C, MATLAB should break execution at the next call to DRAWNOW, PAUSE, GETFRAME, or with a return to the command prompt.
You can use MATLAB algorithms in your C and C++ applications. The MATLAB Engine API for C and C++ enables your applications to use and modify variables in the MATLAB workspace, call MATLAB functions, and evaluate MATLAB commands.
The regionprops function returns the centroids in a structure array. s = regionprops(BW,'centroid'); Store the x- and y-coordinates of the centroids into a two-column matrix.
I only have expreience with calling C or C++ functions from MATLAB. It looks to me like the only difference between calling functions in a shared library and calling functions from a MEX file is that with a shared library, you have to call the function with 'calllib' which is a command line type function and MEX functions allow you to call functions as if they are built-in functions so the interface is a little cleaner.
My suggestion is to use MEX files if
Use shared library if
Really, it comes down to the interface. I personally prefer the MEX file route because it provides the cleanest interface from MATLAB to your C or C++ function. You can call it like just another function with standard MATLAB types. With a shared library, you may have to do some data formatting before calling the library function
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