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A general description is here.
‘bxp()’ now warns when omitting duplicated arguments.
New ‘hcl.colors()’ function to provide wide range of HCL-based colour palettes with much better perceptual properties than existing RGB/HSV-based palettes like ‘rainbow()’.
Also new ‘hcl.pals()’ function to list available palette names for ‘hcl.colors()’.
Contributed by Achim Zeileis.
Default colours for ‘image()’ and ‘filled.contour()’ are now based on ‘hcl.colors()’.
Palette-generating functions ‘rainbow()’, ‘gray.colors()’, etc. get new ‘rev’ argument to facilitate reversing the order of colors.
Support for ‘make install’ has been enhanced.
‘R CMD INSTALL’ gains a new flag ‘--strip’ which strips installed shared object(s): this can also be achieved by setting the environment variable ‘_R_SHLIB_STRIP_’ to a true value.
This is most useful on platforms using GNU ‘binutils’ (such as Linux) and compiling with ‘-g’ flags: it has negligible effect on macOS.