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A replication of MatLab pause function.
pause(x = 0)
optional. If x>0 a call is made to Sys.sleep. Else, execution pauses until a key is entered.
Sys.sleep
Derek Beaton (but the pase of which is provided by Phillipe Brosjean from the R mailing list.)
Copied from: https://stat.ethz.ch/pipermail/r-help/2001-November/