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I have to do it very frequently. I use scipy for that purpose. I am not sure whether you are looking for a analytic function or a callable function. Have a look at following links http://www.scipy.org/Cookbook/FittingData http://docs.scipy.org/doc/scipy/reference/interpolate.html

I have to do it very frequently. I use scipy for that purpose. I am not sure whether you are looking for a analytic function or a callable function. Have a look at following links http://www.scipy.org/Cookbook/FittingData links

http://www.scipy.org/Cookbook/FittingData

http://docs.scipy.org/doc/scipy/reference/interpolate.html