extensive scatter plot

Johannes Korn korn at freisingnet.de
Wed Nov 24 16:12:15 CET 2010


Hi,

I would like to produce a scatter plot with roughly 200 mio points.
Because the points are so numerous I rather need a point density plot.

I use numpy. Right now I loop over the individual data points and make a
where query on a meshgrid.

ind = where((x_grid == x_points[i]) & (y_grid == y_points[i]) )
counter_grid[ind] += 1

This is really slow. I'm sure there's a better solution already out there.

Kind regards!



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