Re: [Matplotlib-users] mpl-1.2.1: Speedup code by removing .startswith() calls and some for loops

[Phil E. <pel...@gm...>]

Hi Martin,

Thanks for this - we are really interested in speeding up the scatter and
barchart plotting with large data sets. In fact, we've done some work (
https://github.com/matplotlib/matplotlib/pull/2156) recently to make the
situation better.

I'd really like to review these changes (against matplotlib master), and
the best possible solution to doing this is if you were to submit a pull
request. If the changes you have made are logically seperable, then I'd
encourage you to make a few PRs, but otherwise, a single PR with all of
these changes would be great.

Would you mind turning these patches into PR(s)? (
https://github.com/matplotlib/matplotlib/compare/)

Thanks!

Phil


On 9 August 2013 12:53, Martin Mokrejs <mmo...@fo...> wrote:

> Hi,
>   I am drawing some barcharts and scatter plot and the speed for rendering
> is awful once you have
> 100 000 of dots. I ran python profiler which lead me to .startswith()
> calls and some for loops
> which append do a list repeatedly. This parts could be still sped up I
> think but a first attempt
> is here:
>
>
> UNPATCHED 1.2.1
>
> real    23m17.764s
> user    13m25.880s
> sys     3m37.180s
>
>
> PATCHED:
>
> real    6m59.831s
> user    5m18.000s
> sys     1m40.360s
>
>
>
> The patches are simple and because I see elsewhere in the code list
> expansions I do not see any
> problems with backwards compatibility (new new python language features
> are required).
>
> Hope this helps,
> Martin
>
>
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