Symbolic algebra

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I'm trying to write a program to output a Lagrange interpolating

So far what I'm getting is output that looks somewhat along the lines of:


What I want is to be able to take that and output it in the form of

Ax^n + Bx^(n-1) ... + C

Does anybody have the experience to tell me how to calculate symbolically?
(Specifically how to implement a symbolic algebra module.)

Re: Symbolic algebra

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There are three modules that you might try at Active .  All are in the Math
group: Math-Symbolic, Math-Approx-Symbolic, and

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