On Wednesday 25 February 2009 09:35:07 am sam tygier wrote:
> I think this topic has come up before, but i don't think anything has
> resulted from it.
>
> I'd like a way for saving a plot from from matplotlib, so that it can be
> re-rendered later, possibly with a different backend, maybe to a different
> size, and maybe with changes to the labels. This would save me having to
> rerun the simulation that generated the plot.
>
> Ideally this would work by having a save_plot() function, that would save
> all state of the current plot into a file. This could then be loaded by a
> program to regenerate that plot.
>
> I have made a rough prototype to demonstrate. It is incomplete. It only
> implements a very small subset of pylab.
>
> I shall attach some files (if these get mangled, then i can upload them
> somewhere).
>
> example1 and example2 are what the plot files might look like.
>
> plot.py renders the plot files.
> eg.
> plot.py example1
> plot.py example2 example.png
>
> fakepylab.py is a wrapper around pylab that record you plotting, and offers
> a save_plot() function
>
> test.py is script that uses fakepylab to create a plot file.
>
> So does any of this look useful? What more might it need to be useful?
>
> Any comments on the file format. Is there an existing standard that could
> be used instead? Would XML be better than plain ascii?
>
> Sam Tygier
I think this is a good idea, but why don't you just save your data to a file
and plot from a different script. If the data is only numbers you can just do
savetxt('data.dat',data) in you simulation script and then
data=loadtxt('data.dat') from your plot script...
Now if you also just use savefig('fig') without suffix, you can just run your
plot script like: python plot.py -DAgg or -DPS or whatever and it will plot to
the default format for that backend.
Best regards
Troels Kofoed Jacobsen
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