The following commands crash:
> plot(1:4,axes=F,log="x")
> axis(1,c(1,2,3,4))
zsh: segmentation fault R
Lines 35-37 of axis():
35: else {
36: ind <- (usr[1] <= at & at <= usr[2])
37: }
should be replaced by
else {
if (log)
ind <- (10^usr[1] <= at & at <= 10^usr[2])
else ind <- (usr[1] <= at & at <= usr[2])
}
Moreover, there should be a check if length(at) equals zero before calling
the internal axis command.
But wait, there's more:
> plot(1:4,log="x")
> plot(1:4)
The second call of plot produces an empty plot. The following sequence
works:
> plot(1:4,log="x")
> par(xlog=F)
> plot(1:4)
Why does R have the graphical parameters "xlog" and "ylog"?
They do not
seem to work for me and are not used by S-Plus.
Arne
--
Arne Kovac
School of Mathematics Phone: +44 (0117) 942 7551
University of Bristol A.Kovac@bristol.ac.uk
University Walk, Bristol, BS8 1TW, U.K. http://www.stats.bris.ac.uk/~maak
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