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Here is the location of the source code (using Dropbox).
The problem is in the fact that it doesn’t evaluate zeros properly.
For example: x^2-2x-8 should equal the zeros of {-4, 2}, but instead I get a long exponential value like -4+34534....E-25<i>i</i>.
It does work for polynomials with single roots (such as x<sup>2</sup>+4x+4, root = {-2})
Can anyone spot the problem, it’s been frustrating me for weeks. This is NOT a homework assignment, this is something I work on in my free time.
I’ve run into problems like this before and decided to switch to a different (math-oriented) language. You could try using floats instead of doubles, which may do the trick, but would probably bear problems of their own. Or you could write a method that filters out anything smaller than 1E-10 or something along those lines. Another alternative (which may or may not be relevant here) would be to use JLink.