MATLAB: Creating matrixes in .mat file

matrix array

I want to create a .mat file and inside the .mat file, there are variables that represent individual matrices. So lets say in the .mat file I have a, b, c, d. And each a, b, c, d has its own matrix and I can add contents into each matrix. Is there a way to do this? thanks

Best Answer

Yeah Victor. It can be done easily. Please specify matrix a b c and d and then simply create matrix whose elements are a b c d. It works. try it out.

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MATLAB: Save using -append behaves differently when replacing objects vs replacing arrays

save -append has always been defined to patch out the old data and add the new data to the end of the .mat file without necessarily reducing the file size at all. It is possible that there is an optimization for the case of a single numeric array or the case of a numeric array that happens to be the last thing in the file, but that has never been guaranteed. At no time has save -append been defined as needing to remove the old data and "dropping down" whatever follows to fill the hole. The -append flag is for fast updating of a .mat file, not for space efficiency.

If you need to update variables inside a .mat file you should consider using a -v7.3 file and using matFile()

MATLAB: How to document a .mat file or add a content file

Perhaps the list of contained variables obtained by

whos('-File', MATFileName)

? If this does not match your needs, add a field "contents" to the MAT files or something similar.

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MATLAB: Save using -append behaves differently when replacing objects vs replacing arrays

MATLAB: How to document a .mat file or add a content file

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