Programmatically Change Preferences?

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

Accepted Answer

Fangjun Jiang
Fangjun Jiang on 15 Sep 2020
to save matfiles as version 7.3, use save(FILENAME, ..., VERSION)
to set MATLAB preference,
meghannmarie on 15 Sep 2020
I think this may work, trying it now:
s = settings;
s.matlab.general.matfile.SaveFormat.TemporaryValue = 'v7.3';

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