MATLAB: -v7.3 switch

-v7.3save

Hi everyone~

I had problem saving a large variable (It's a cell. I think the problem is it's very large)

The message is this:

Warning: Variable 'results_all' cannot be saved to a MAT-file whose version is older than 7.3. To save this variable, use the -v7.3 switch.

I couldn't find out how to use the -v7.3 feature. Could somebody help? Thanks a lot~

Best Answer

If the file is larger than 2GB then you will have to use 7.3. You can choose the version 7.3 option in the MATLAB preferences. The following article has information about the different formats:

http://www.mathworks.com/help/matlab/import_export/mat-file-versions.html

Related Solutions

MATLAB: Saving all Mat file as default with -v7.3

rootgroup = settings();
rootgroup.matlab.general.matfile.SaveFormat.PersonalValue = 'v7.3';

Note: this will change the matlab.settings file in prefdir(), provided that there is permission to change it. So this is the same as if you had used the menu to change the preference.

MATLAB: Saving variable with -v7.3 flag check

Use the whos function:

varinfo=whos('data');
saveopt='';
if varinfo.bytes >= 2^31
  saveopt='-v7.3';
end
save('filename','data',saveopt);

This code is a bit too conservative in that it will use -v7.3 format when data is over 2gb but only needs to when a member of data is over 2gb. I do not see that as a problem and checking all members is a bit more work.

That said I would not do this. I would use the -v7.3 option for all files. Some day in the future it may complicate things to have files that are of different formats.

Best Answer

Related Solutions

MATLAB: Saving all Mat file as default with -v7.3

MATLAB: Saving variable with -v7.3 flag check

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