Programmatically Change Preferences?

How do I promatically change preferences? I am running a script from command line in linux (on a HPC). I am using a tall array and I am getting this error: "Error using matlab.mapreduce.internal.Serializer/writeToMatfile (line 44). Unable to write to MAT-file because one of the values exceeds the size limit. Ensure each value is less than 2GB or use a Hadoop location." I think I may have to set my preferences to save matfiles as version 7.3. How do I do that in a script?

I tried this on my windows machine and it does not seem to work.

pref = regexp( fileread(fullfile(prefdir,'matlab.prf')), '\n', 'split');
loc = find(~cellfun(@isempty,regexp(pref,'MatfileSaveFormat=')));

if isempty(loc); pref{end+1} = 'MatfileSaveFormat=Sv7.3';
else;            pref{loc} = 'MatfileSaveFormat=Sv7.3';
end

fid = fopen(fullfile(prefdir,'matlab.prf'), 'w');
fprintf(fid, '%s\n', pref{:});
fclose(fid);

Any ideas?

Answer 1

[Fangjun Jiang]

to save matfiles as version 7.3, use save(FILENAME, ..., VERSION)

to set MATLAB preference, https://www.mathworks.com/help/releases/R2020a/matlab/matlab_external/access-and-modify-settings.html

[meghannmarie]

I am not saving any files, so I cannot use save(FILENAME, ..., VERSION). The tall array function is saving a matfile in a temporary folder.

[meghannmarie]

I think this may work, trying it now:

s = settings;
s.matlab.general.matfile.SaveFormat.TemporaryValue = 'v7.3';