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A general description is here.
‘Sweave()’ has options to produce PNG and JPEG figures. There is also a temporary option to call a user-defined graphics device.
(Based in part on the contribution of PR#14418.)
‘R_inspect(obj)’ and ‘R_inspect3(obj, deep, pvec)’ are (hidden) C-level entry points to the internal ‘inspect’ function and can be used for C-level debugging (e.g., in conjunction with the ‘p’ command in ‘gdb’).