[R] Managing size of plots with many points

[Spencer Graves]

What is available to limit obvious overplotting, e.g. with a million points? My primary motivation is to produce plots from R and S-Plus that occupy minimal hard drive space without sacrificing visual clarity. (I've crashed MicroSoft PowerPoint by including plots that are too big.)

Right now, I can think of three different scenarios:

1. Monotonic applications such as a normal probability plot.

2. Lines (or connected dots).

3. General scatterplots.

Several approaches have been suggested, and I've implemented an ugly algorithm. However, I believe something better should be available, but I don't even know what words to use in a search.

Ideas?
Thanks,
Spencer Graves

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