Re: fast scatter plots - advice sought

[David Bateman]

Jaroslav Hajek wrote:
> hi,
>
> I recently started some work where I'm going to use scatter plots
> heavily with a few thousand points.
> I found out, however, that scatter plots were unusably slow with so
> many points. This has also been reported before:
>
> http://old.nabble.com/scatter3-is-really-slow-to24312164.htm
>
> by this changeset
> http://hg.savannah.gnu.org/hgweb/octave/rev/2f435ed48143
>
> I tried to optimize the plotting strategy to get more reasonable
> times, especially in the simplest cases. The old strategy of creating
> one object per point is only used for small numbers of points (<= 20).
> Otherwise, the points are split into subsets with common color and
> size, and these subsets are plotted using a single primitive. This
> seems similar to what Matlab does.
>   
If this is done in the baackend ok, but I deliberately didn't make this 
change in the frontend as it breaks matlab compatibility

D.