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A general description is here.
‘Sweave()’ has options to produce PNG and JPEG figures, and to use a custom function to open a graphics device (see ‘?RweaveLatex’). (Based in part on the contribution of PR#14418.)
The default for ‘Sweave()’ is to produce only PDF figures (rather than both EPS and PDF).
Printing extremely long string values could overflow the stack and cause the GUI to crash. (PR#14543)