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I had this problem and was able to use "from matplotlib.mlab import griddata". I'm playing with portable python which appears to have:

matplotlib version 0.98.52 scipy version 0.7.0.dev5180 and numpy version 1.2.1

The matplotlib.mlab version of griddata accepts exactly 5 arguments like this: zi = griddata(x,y,z,xi,yi) and uses delauney nearest neighbor triangulation.

Hope that helps!