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RuntimeError: To use interp='nn' (Natural Neighbor interpolation) in griddata,

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faxer92:
Dear Sir
When execute Prof. Blom's code "cb_plot.py" from
http://quantumwise.com/forum/index.php?topic=3376.0
 I get an error:

File ".\build\lib\site-packages\matplotlib-1.5.0-py2.7-win-amd64.egg\matplotlib\mlab.py", line 3421, in griddata
RuntimeError: To use interp='nn' (Natural Neighbor interpolation) in griddata, natgrid must be installed. Either install it from http://github.com/matplotlib/natgrid or use interp='linear' instead.

how to I do to make it work?
Regards

Anders Blom:
Well, the answer is given in the error message, but I have attached an updated version of the script. It's not an exact replica because it also plots the Brillouin zone, but that's probably what you want :)

faxer92:
Wonderful..!!!!  you really do me a big favor.Thank you very much (BTW, your reply is very efficient!!!)

faxer92:
Dear Sir
Would you please show me more examples of learning how to convert (kA,kB) to (kx,ky)? For example, to plot 2D surface (kz=0) in fig3.6 in http://www.iue.tuwien.ac.at/phd/dhar/node18.html. Thank you very much.

Jess Wellendorff:
This tutorial should provide an example: http://docs.quantumwise.com/tutorials/topological_insulator_bi2se3/topological_insulator_bi2se3.html#fermi-surface-and-spin-directions

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