There seems to be a bug in "image" in R 13.1 (on windows 32 & 64 bits) and
on R-devel that is not present in R 13.0 and before.

The below creates a plot with many white lines, horizontal and vertical,
more or less regularly spaced. The effect is particularly dramatic when the
plotting window is made very small.

image(t(volcano)[ncol(volcano):1,])

Robert Hijmans
University of California, Davis


> sessionInfo()
R version 2.13.1 (2011-07-08)
Platform: x86_64-pc-mingw32/x64 (64-bit)

locale:
[1] LC_COLLATE=English_United States.1252
[2] LC_CTYPE=English_United States.1252
[3] LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C
[5] LC_TIME=English_United States.1252

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base
>

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