[R] defmacro and bwplot incompatibilities?

[Geoffrey]

Perfect, thanks very much.

On 10/12/12 02:00, Jeff Newmiller wrote:
> 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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>
>