cast as a double, note the asterisk in front of mxGetPrĭouble* arr = (double*) mxGetPr(prhs) Often you will need to cast the argument into a corresponding C++ type, e.g. Regardless of the type of argument, whether it is a number, a matrix or an object, its type is mxArray. Access each dummy argument with index i = 0.
Here, nlhs and nrhs refer to the number of output and input arguments respectively. Note that the above function should always be called mexFunction and its signature be int nlhs, mxArray *plhs, int nrhs, const mxArray *prhs. Void mexFunction(int nlhs, mxArray *plhs, Compile the extension using the MATLAB command mex myFunction.cppĪt the minimum, the C++ extension should contain: #include.myFunction.cpp for a function named myFunction. The name of the C++ file should match the name of the function to call from MATLAB, e.g. Identify the input and output variables of the section of code to extend.Focus on a loop to extend, preferably a nested set of loops.This involves the following steps (using C++ as an example): More info about compiling software on NeSI here. Instructions inside large MATLAB loops are often performance hotspots due to the interpreter's overhead, which consumes CPU time at every iteration.įortunately MATLAB lets programmers extend their scripts with C/C++ or Fortran, which is referred to as mexing. Like other scripting languages, MATLAB code will generally run slower than compiled code since every MATLAB instruction needs to be parsed and interpreted. Please contact support if you have any issues.
Compile using the -DWITH_OPENCL=OFF flag.Use a version of OpenCV built using GCC (as opposed to gimkl).Some of the internal MATLAB libraries clash with those used by OpenCV, to avoid problems cause by this Mexopencv is mex wrapper MATLAB wrapper for the openCV library. #SBATCH -job-name MATLAB_job # Name to appear in squeue Use relative paths when possible and not avoid using '\'s see here. When developing MATLAB code on your local machine, take measures to ensure it will be platform independent. If you want to run MATLAB code on the cluster, but are not a member of an institution without access to floating licences, MATLAB code can still be run on the cluster using MCR.
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