[R] scatterplot of 100000 points and pdf file format
B.Rowlingson at lancaster.ac.uk
Wed Nov 24 19:19:38 CET 2004
> I would strongly suggest a different method to present the data such as a
> contour plot or 3D bar plot. An XY plot with a million points is unlikely to
> be readable unless it is produced as a large format print. At 200 DPI
> printed, 1,000,000 discrete points requires a minimum of a 5 inch (12.7
> cm) by 5 inch area. Besides, other than being visually overwhelming, what
> information would such a plot offer a viewer?
I recall some of our extreme value statistics people printing things
like this. Several million points on a plot. Most of which were in a
big, thick block of toner, and then a few hundred at the extremes which
was where they where interested in looking.
Of course these things took an hour to print on a PostScript printer
at the time. I think I suggested only plotting points for which X >
someThreshold. Saved on toner and time. Got a bit tricky in the
bivariate case though, where you really needed to plot points outside
some ellipse that you knew would otherwise be a big black blob, and then
you filled that in with a black ellipse.
Contours or aggregation wasn't any use, since they were interested in
the point patterns of the extreme value data.
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