You can try the below tutorial. 1. http://wiki.scipy.org/Cookbook/FittingData
2. http://people.duke.edu/~ccc14/pcfb/analysis.html Also, take a look at the below curve fitting tool from optimization tool set of scipy. I think it will help you better and with ease. http://docs.scipy.org/doc/scipy/reference/generated/scipy.optimize.curve_fit.html If you are writing program on your own try lambda to define your function, use some library module like scipy for fitting / optimization and library module like pylab to plot.
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