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A general description is here.
Most users of the X11() device will see a new device that has different fonts, anti-aliasing of lines and fonts, and supports semi-transparent colours.
Progress-bar functions txtProgressBar(), tkProgressBar() in package tcltk and winProgressBar() (Windows only).
Progress-bar functions txtProgressBar(), tkProgressBar() in
package tcltk and winProgressBar() (Windows only).
optim(*, control = list(...)) now warns when '...' contains unexpected names, instead of silently ignoring them.