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I'm making some contour plots in matplotlib and the length of the dashes are too long. The dotted line also doesn't look good. I'd like to manually set the length of the dash. I can set the exact dash length when I'm making a simple plot using plt.plot(), however I cannot figure out how to do the same thing with a contour plot. I think that the following code should work, but I get the error: File "/Library/Python/2.7/site-packages/matplotlib-1.2.x-py2.7-macosx-10.8-intel.egg/matplotlib/backends/backend_macosx.py", line 80, in draw_path_collection offset_position) TypeError: failed to obtain the offset and dashes from the linestyle Here is a sample of what I'm trying to do, adapted from the MPL examples: import numpy as np import matplotlib.mlab as mlab import matplotlib.pyplot as plt delta = 0.025 x = np.arange(-3.0, 3.0, delta) y = np.arange(-2.0, 2.0, delta) X, Y = np.meshgrid(x, y) Z1 = mlab.bivariate_normal(X, Y, 1.0, 1.0, 0.0, 0.0) Z2 = mlab.bivariate_normal(X, Y, 1.5, 0.5, 1, 1) # difference of Gaussians Z = 10.0 * (Z2 - Z1) plt.figure() CS = plt.contour(X, Y, Z, 6, colors='k',linestyles='dashed') for c in CS.collections: c.set_dashes([2,2]) plt.show() Thanks!

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