Forces every graphics device to pause before starting a new plot; hit the
key to draw the next plot.
USAGE:
dev.ask(ask=T)
OPTIONAL ARGUMENTS:
ask
logical flag: if
TRUE, graphics devices will not erase plots without
permission; if
FALSE, graphics device write over plots whenever you
begin a new plotting command.
VALUE:
logical value containing the last value for global pausing.
SIDE EFFECTS:
if
ask=TRUE, every graphics device pauses before starting new plots.