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% Exporting a figure in Matlab to PDF often outputs an A4-sized pdf file. This snippet can export a minimal size pdf which can be used in TeX files directly.
% some figures here
figure;
plot(zeros([1, 5]));
% codes that works
fig = gcf;
fig.PaperPositionMode = 'auto';
fig_pos = fig.PaperPosition;
fig.PaperSize = [fig_pos(3) fig_pos(4)];