How can I read a Matlab cell array stored as a .mat file and having 3*3*2 multidimensional double data into a c/c++ array ?
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3 Answers
Link against libmx.lib, libmat.lib, libeng.lib, and include the headers mat.h and engine.h. I'm ignoring the imaginary component of the data and assuming you know how to use the C++ STL. The code below is adequate, but an easier interface called mxWrapper is available here: http://www.mathworks.com/matlabcentral/fileexchange/28331-replacement-for-mwarray-using-matlab-engine
vector<double> readSomeNumbers()
{
vector<double> data;
mxArray *pMx=load("c:\\someFile.mat", "foobar");
if (!pMx) return data;
ASSERT(mxGetClassID(pMx) == mxDOUBLE_CLASS);
data.assign(mxGetPr(pMx), mxGetPr(pMx)+mxGetNumberOfElements(pMx));
mxDestroyArray(pMx);
return data;
}
mxArray *load(const string& fileName, const string& variableName)
{
MATFile *pmatFile = matOpen(fileName.c_str(), "r");
if(pmatFile == NULL)
return NULL;
mxArray* pMx = matGetVariable(pmatFile, variableName.c_str());
if(pMx == NULL)
{
matClose(pmatFile);
return NULL;
}
matClose(pmatFile);
return pMx;
}
Comments
The MATLAB file format is documented here. Doesn't look too hairy.
Edit: Sorry, the link got corrupted.
1 Comment
iceman
The documentation link you followed is no longer valid.
This doc describes the interface to read and write MAT files in C/C++:
http://www.mathworks.com/access/helpdesk/help/techdoc/matlab_external/f39876.html#f13830
1 Comment
iceman
I read the docs but I'm a little confused. How can i import data from the mxarray data structure to a primitive data structure like a multi-dim double array ? can anyone give me a code snippet..