[R] Lattice xyplot - problem trying to produce multiple output files with a 'for' loop
Sundar Dorai-Raj
sundar.dorai-raj at PDF.COM
Fri May 7 22:56:37 CEST 2004
richard.kittler at amd.com wrote:
> I am stuck on trying to get the Lattice xyplot to output a separate PNG file each time through my 'for' loop. The files get produced but are empty.
>
> Here is the code. I'm running 1.9 on Windows. BTW is there a more efficient way of creating the separate output files than looping over the levels and subsetting?
>
> .........................................................
> lev <- levels(ds$TR)
>
> for (byvar in lev) {
>
> file.png <- paste("u:/data/R/Scatter_CTY_HWY_CO_TR", byvar, ".png", sep="")
>
> trellis.device( device="png", file=file.png,
> width=1000, height=1000, pointsize=20, bg="transparent" )
>
> ds1 <- subset(ds, TR == byvar, select=c(CTY, HWY, CO))
>
> xyplot( ds1$CTY ~ ds1$HWY, groups=ds1$CO,
> auto.key=list(space="right"), ylab="CTY", xlab="HWY")
>
> dev.off()
>
> }
> .........................................................
>
> --Rich
>
> Richard Kittler
> AMD TDG
> 408-749-4099
>
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See the FAQ.
you have to wrap the xyplot call with a print. I.e.
for(...) {
...
print(xyplot(...))
...
}
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