Re: [Matplotlib-users] Colormap.__call__ is slow

[Eric F. <ef...@ha...>]

João Luís Silva wrote:
> Hello all,
> 
> I'm creating a python application what does some calculation and 
> displays the result as two imshow() with respective colorbars as the 
> calculation progresses. Each array is ~8192x50. Updating the image is 
> slow, so I only update every 2 seconds or so, but even doing this a 
> significant part of the program's time is spent on Colormap.__call__ of 
> colors.py. Another significant time sink is motion_notify_event of 
> backend_gtk.py. A small example follows to illustrate the problem. Any 
> ideia on how to circunvent or correct this?

Some time in the last year I made changes in mpl and in numpy to speed 
this up (the colormapping).  What versions of mpl and numpy are you using?

Eric

> 
> Thank you,
> João Luís Silva
> 
> ----------------------------------------
> 
> import numpy as np
> from numpy.random import rand
> import pygtk
> pygtk.require('2.0')
> import gtk
> import matplotlib
> matplotlib.use('GTKAgg')
> from matplotlib.backends.backend_gtkagg import FigureCanvasGTKAgg as 
> FigureCanvas
> from matplotlib.figure import Figure
> 
> def main():
>      N = 2000
> 
>      win = gtk.Window()
>      vbox = gtk.VBox()
>      fig = Figure()
>      ax = fig.add_subplot(111)
>      canvas = FigureCanvas(fig)
>      im = 
> ax.imshow(rand(N,N),origin='lower',aspect='auto',extent=(0.0,1.0,0.0,1.0),interpolation='bilinear')
>      cb = fig.colorbar(im)
>      vbox.pack_start(canvas)
>      win.add(vbox)
>      win.connect("destroy", lambda x: gtk.main_quit())
>      win.show_all()
>      gtk.main()
> 
> if __name__ == '__main__':
>      #Use hotshot2calltree and kcachegrind to see the stats
>      import hotshot
>      prof = hotshot.Profile("hotshot_stats")
>      prof.runcall(main)
>      prof.close()
> 
> 
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