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POAnimation with contours matplotlib
 

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    <p>I am trying to animate contours in matplotlib 1.1.0</p> <p>Based on: <a href="http://www.mail-archive.com/matplotlib-users@lists.sourceforge.net/msg17614.html">http://www.mail-archive.com/matplotlib-users@lists.sourceforge.net/msg17614.html</a>, <a href="http://matplotlib.1069221.n5.nabble.com/Matplotlib-1-1-0-animation-vs-contour-plots-td18703.html">http://matplotlib.1069221.n5.nabble.com/Matplotlib-1-1-0-animation-vs-contour-plots-td18703.html</a> and <a href="http://www.scipy.org/Cookbook/Matplotlib/Gridding_irregularly_spaced_data">http://www.scipy.org/Cookbook/Matplotlib/Gridding_irregularly_spaced_data</a></p> <pre><code>from numpy import linspace,exp,vstack from scipy.interpolate import griddata import matplotlib.pyplot as plt import matplotlib.animation as animation from numpy.random import uniform, seed def main(): seed(1234) x = uniform(-2,2,100) y = uniform(-2,2,100) data = vstack((x*exp(-x**2-y**2),0.5*x*exp(-x**2-y**2),0.2*x*exp(-x**2-y**2))) xi = linspace(min(x), max(x)) yi = linspace(min(y), max(y)) zi = [] numframes = data.shape[0] for ii in range(numframes): zi.append(griddata((x, y), data[ii], (xi[None,:], yi[:,None]), method='cubic')) fig = plt.figure() im = plt.contour(xi, yi, zi[0], 15, linewidths=0.5, colors='k') ani = animation.FuncAnimation(fig, update_contour_plot, frames=xrange(numframes), fargs=(zi, im, fig, xi, yi), interval=100) plt.colorbar() plt.show() def update_contour_plot(i, data, im, fig, xi, yi): for coll in im.collections: try: plt.gca().collections.remove(coll) except ValueError: #Everything is not removed for some reason! pass im = plt.contour(xi, yi, data[i], 15, linewidths=0.5, colors='k') plt.title(str(i)) return im, main() </code></pre> <p>1) Is this the best way to do this? Mention otherwise.</p> <p>2) In the final output, contour lines from previous frame are still visible. How do I remove them? See except ValueError:</p>
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    1. COdoes the `ValueError` carry any message with it?
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    2. COWithout try: except: the read out is plt.gca().collections.remove(coll) ValueError: list.remove(x): x not in list
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    3. CO+1 for good example code
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