Masha,
As suggested before, take a look at the triangular mesh functions. There
are simple contour (
http://matplotlib.org/examples/pylab_examples/tricontour_demo.html) and
pcolor plots (
http://matplotlib.org/examples/pylab_examples/tripcolor_demo.html), plus
linear and cubic interpolation (
http://matplotlib.org/examples/pylab_examples/tricontour_smooth_delaunay.html
and
http://matplotlib.org/examples/pylab_examples/tricontour_smooth_user.html).
The API documentation is at http://matplotlib.org/dev/api/tri_api.html.
Ian
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