[R] issue with image plot in 2.13.1

[Jorge I Velez]

Hi Alan,
Thank you for the reproducible example. 
One way to solve it is setting "len" to a bigger number, e.g. len = 500.  However, this might slow down the plotting.
HTH,
Jorge

On Aug 16, 2011, at 7:41 PM, Swanson, Alan wrote:

> R gurus,
> I'm having an issue with the appearance of image plots produced by R-2.13.1.  When I plot an image (example code pasted below), thin white lines appear between rows and columns of pixels.  The location of the lines seems somewhat random and change as the graphics device is re-sized.  This occurs using a range of graphic devices (windows, png, bmp, jpeg, tiff, pdf), on two different machines (windows 7-64 bit and windows XP-32 bit) but not when using 2.13.0 on either machine.  Do others have this issue?  Any possible solutions?
> Regards,
> Alan
> 
> x <- y <- seq(-4*pi, 4*pi, len=27)
> r <- sqrt(outer(x^2, y^2, "+"))
> image(z = z <- cos(r^2)*exp(-r/6), col=gray((0:32)/32))
> 
>> 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
> 
> other attached packages:
> [1] rj_0.5.5-4
> 
> loaded via a namespace (and not attached):
> [1] tools_2.13.1
> 
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