Hi,
I used already the classes of the analysis package:
http://commons.apache.org/math/userguide/analysis.html
There is already a fine class for Polynomial Functions which can calculate
the derivation:
PolynomialFunction.derivative()
I would like to suggest a class called "RationalFunction" which can do
almost the same but for (you guessed it) Rational Functions.
Suggested methods are: derivative() , add(RationalFunction r), a.s.o.
http://en.wikipedia.org/wiki/Rational_function
If this is something which you would like to have I will start coding it
to provide a patch.
The next thing is "Trigonometric Functions" and their derivatives:
http://en.wikipedia.org/wiki/Trigonometric_function_derivations#Derivatives_of_trigonometric_functions
It would also be nice to have classes for that type of function.
 Bernhard

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