[R] defmacro and bwplot incompatibilities?

Jeff Newmiller
Sun, 09 Dec 2012 16:00:17 -0000

bwplot is a trellis function. There is something very basic about the way that
library works that any intro to trellis/lattice should tell you:

http://cran.r-project.org/doc/FAQ/R-FAQ.html#Why-do-lattice_002ftrellis-graphics-not-work_003f
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Sent from my phone. Please excuse my brevity.

Geoffrey <lordgeoffrey at optusnet.com.au> wrote:

>My macro doesn't work for bwplot. But is working elsewhere.
>What changes should i make to fix my macro.
>Thanks.
>
>The complete code sample is:
>library(gtools)
>library(lattice)
>
>pic <- defmacro(fn, plotfunc, expr={png(filename=fn); plotfunc;
>dev.off()})
>
># this one fails.
>pic("bw.png", {bwplot(Species ~ Sepal.Length, data=iris)})
>
># this one works
>pic("p.png", {plot(iris$Sepal.Length)}
>
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