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POColor matplotlib plot_surface command with surface gradient
 

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    <p>I would like to convert surf command from <strong>MATLAB</strong> to plot_surface command in <strong>matplotlib</strong>.</p> <p>The challenge I am facing is when using <em>cmap</em> function in plot_surface command to color the surface with gradient.</p> <p>Here is the <strong>matlab</strong> script</p> <pre><code>% Matlab Commands x = -5:.25:5; y = x [x,y] = meshgrid(x); R = sqrt(x.^2 + y.^2); Z = sin(R) surf(x,y,Z,gradient(Z)) </code></pre> <p>The figure from such a command can be found here. <a href="http://www.mathworks.com/help/techdoc/visualize/f0-18164.html#f0-46458">(http://www.mathworks.com/help/techdoc/visualize/f0-18164.html#f0-46458)</a></p> <p>Here is the <strong>python</strong> scipt When using python and matplotlib to create a similar function I am unable to color the surface with a gradient. </p> <pre><code># Python-matplotlib Commands from mpl_toolkits.mplot3d import Axes3D from matplotlib import cm import matplotlib.pyplot as plt import numpy as np fig = plt.figure() ax = fig.gca(projection='3d') X = np.arange(-5, 5, 0.25) Y = np.arange(-5, 5, 0.25) X, Y = np.meshgrid(X, Y) R = np.sqrt(X**2 + Y**2) Z = np.sin(R) surf = ax.plot_surface(X, Y, Z, rstride=1, cstride=1, cmap=gradient(Z), linewidth=0, antialiased=False) plt.show() </code></pre> <p>I get the following error message: </p> <pre><code>Traceback (most recent call last): File "&lt;ipython console&gt;", line 1, in &lt;module&gt; File "C:\Python26\lib\site-packages\spyderlib\widgets\externalshell\startup.py", line 122, in runfile execfile(filename, glbs) File "C:\Documents and Settings\mramacha\My Documents\Python\Candela\tmp.py", line 13, in &lt;module&gt; surf = ax.plot_surface(X, Y, Z, rstride=1, cstride=1, cmap=gradient(Z), linewidth=0, antialiased=False) File "C:\Python26\lib\site-packages\mpl_toolkits\mplot3d\axes3d.py", line 729, in plot_surface polyc = art3d.Poly3DCollection(polys, *args, **kwargs) File "C:\Python26\lib\site-packages\mpl_toolkits\mplot3d\art3d.py", line 344, in __init__ PolyCollection.__init__(self, verts, *args, **kwargs) File "C:\Python26\lib\site-packages\matplotlib\collections.py", line 570, in __init__ Collection.__init__(self,**kwargs) File "C:\Python26\lib\site-packages\matplotlib\collections.py", line 86, in __init__ cm.ScalarMappable.__init__(self, norm, cmap) File "C:\Python26\lib\site-packages\matplotlib\cm.py", line 155, in __init__ self.cmap = get_cmap(cmap) File "C:\Python26\lib\site-packages\matplotlib\cm.py", line 126, in get_cmap if name in cmap_d: TypeError: unhashable type: 'list' </code></pre> <p>Any inputs would be helpful. </p> <p>Praboo</p>
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