Tightly cropped PDF (programatically not intereacitvely)

Question

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I know it is possible to interactively save a figure as a PDF that is tighlty cropped around the axes content using the export button, as described here:

https://www.mathworks.com/help/matlab/creating_plots/saving-your-work.html

I would like to ask though, how can we achieve the exact same tight cropping programatically? I tried using the below code but it did not have the same effect:

set(gcf,'Units','inches');
screenposition = get(gcf,'Position');
set(gcf,...
    'PaperPosition',[0 0 screenposition(3:4)],...
    'PaperSize',[screenposition(3:4)]);