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Aiyah Vish
Dept. of Electrical Eng.
University of Saskatchewan
Saskatoon, SK, S7N OWO Canada

One may end up with x-y values from experiments or any other situation which may not always be linear in nature. Under such circumstances it is rather difficult to perform differentiation or achieve a best-fit to the data, either due to the fact that the differentiation gets too noisy or the best-fit may not be a true representation of the original data! In this algorithm, a parabolic curve is plotted through the x-y values and the output of differentiated and best-fit values are written to a file. This program requires Microsoft Windows 3.

(from the documentation)
Download [100 KB].

Look at the readme file from the program.