> So what could be the difference between the last example and it running
> in a loop, that the former generates a proper jpeg file and the lattter
> does not?
>
> Does something more special than dev.off() need to be done with qplot
> output when in a loop?
As well as Henrik's advice, you could also try using ggsave:
for (step in 1:length(steps)) {
qplot(x, y, data=steps[[step]], geom="tile", fill=rgb(V1,V2,V3)) +
scale_fill_identity() + opts(aspect.ratio = .75)
ggsave(file=paste("frame_",sprintf("%05d",step),".jpg",sep=""))
}
Hadley
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