Matlab struct with names and sizes of the mat.file
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Hi, I am trying to create a function that asks for mat.file and then I would like t o create a struct which returns the name and size of the variables in the mat.file.
Anyone who knows how to do that?
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Walter Roberson
2021-5-12
Use whos() with the '-file' option and extract the required data from that.
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Walter Roberson
2021-5-13
whos() is built-in, so I cannot look at the source code for it. There is no documented way to get whos() to only display specified fields.
But why are you asking about displaying fields? Your question and comments indicate that you want the information returned as a struct with field 'name' and 'size' . Displaying is a different task.
The below code has been constructed to mimic the output of whos. It might have some fine details wrong about automatic sizing or justification of field widths.
function info = fileinfo(filename)
if ~exist(filename, 'file')
error(message('MATLAB:whos:fileIsNotThere', filename));
end
tinfo = whos('-file', filename);
if nargout > 0
info = struct('name', {tinfo.name}, 'size', {tinfo.size});
else
fields = ["name", "size"; "", ""; string({tinfo.name}.'), cellfun(@(S) strjoin(arrayfun(@string,S),'x'), {tinfo.size}.')];
L = strlength(fields);
widths = max(L,[],1);
fmt = compose(" %%-%ds %%-%ds", max([14, 0], widths));
fprintf('%s\n', compose(fmt, fields(:,1), fields(:,2)))
end
end
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