> I wonder whether it is possible to speed up plots of 2-dimensional > images (such as image() or levelplot()) in order to export lower quality > versions of the resulting plots.
> But the underlying arrays are > so big (900x900 entries) that the export of every single image takes > very long. I think the only way is to upscale your arrays before calling image() or levelplot(), maybe with a simple fortran or C routine who scales the original to a 450x450 (mean of 2x2 pixel blocks, if your values are summable). Or you just do a sample() of your original array, provided it has a certain degree of continuity. I very often have to produce 512x512 images, and it doesn't seem to be any particularly intensive procedure; I mean, it is done within seconds. ScionForbai ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
