On Fri, Jul 9, 2010 at 6:28 AM, Johannes Röhrs <johanne...@met.no> wrote:
> I have some troubles updating a contour plot. I reduced my code to a simple
> example to reproduce the problem:
>
> [code]
> from pylab *
> import scipy as sp
>
> x=sp.arange(0,2*sp.pi,0.1)
> X,Y=sp.meshgrid(x,x)
> f1=sp.sin(X)+sp.sin(Y)
> f2=sp.cos(X)+sp.cos(Y)
>
> figure()
> C=contourf(f1)
> show()
>
> C.set_array(f2)
> draw()
> [\code]
>
> What do I need to do to update an existing contour plot with new data?
The set_array() method (I think) only impacts the colormapping
information for contourf, and even then doesn't appear to update.
What you need to do is make a new contour plot and remove the old one,
especially if you need to change the underlying contoured data. This
should be as easy as C.remove(), but for some reason, this doesn't
exist (I'll go add it in a minute). So instead, you need to do the
following:
import matplotlib.pyplot as plt
import numpy as np
x = np.arange(0, 2 * np.pi, 0.1)
X,Y = np.meshgrid(x,x)
f1 = np.sin(X) + np.sin(Y)
f2 = np.cos(X) + np.cos(Y)
plt.figure()
C = plt.contourf(f1)
plt.show()
for coll in C.collections:
plt.gca().collections.remove(coll)
C = plt.contourf(f2)
plt.draw()
Ryan
--
Ryan May
Graduate Research Assistant
School of Meteorology
University of Oklahoma
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