in reply to quadratic and exponential regression
I noticed Algorithm::CurveFit, and it looks like it would do the job, though it seems you have to define your error function with Math::Symbolic. It's too bad they didn't simply specify the interface to a function you could provide. (Well, they may, but a brief review of the docs didn't make that obvious to me.)
...roboticus
When your only tool is a hammer, all problems look like your thumb.
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