How to convert a large .mat file of (default format ~ 7) to a 7.3 MAT-file / HDF5 based format when the file is too large to load.

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Jamie
Jamie 2016-8-17
评论： Gaël 2021-3-4
I have a program which exports .mat files in the default .mat format - I believe it v7 MAT-file? Due to the size I am unable to load the .mat file. When attempting to load the .mat file I receive an "Error using load. Cannot read file X". I have no control over the output of the program used to generate the .mat file. Is there a way in which the .mat file may be accessed to retrieve the content? Ideally I would like to retrieve the data and save it in a v7.3 MAT-file format. Thanks!

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Walter Roberson
Walter Roberson 2016-8-17
-v7 format .mat files cannot have any component which is larger than 2 gigabytes. This suggests a strategy of using load() to request particular variables from the -v7 .mat file, and write the contents to the -v7.3 .mat file (possibly using matFile)
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Gaël
Gaël 2021-3-4
I'm really new to matlab but I had to update the code like this to get it run:
in_matname = 'YourMatFileName.mat';
out_matname = 'NewMatFileName.mat';
S = whos('-file', in_matname);
for K = 1 : length(S)
thisvarname = S(K).name;
% disp(K);
% disp(thisvarname);
datastruct = load(in_matname, thisvarname);
if K == 1
save(out_matname, '-v7.3', '-struct', 'datastruct');
else
save(out_matname, '-struct', 'datastruct', '-append');
end
end

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