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Math Help - Help with nonlinear regression / curve fitting

  1. #16
    Grand Panjandrum
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    Quote Originally Posted by Jhevon View Post
    i see, but aren't all similar utilities like that? Is Euler any different in that respect?
    No, Euler is a basic matrix language (the great idea behind Matlab), without
    all the accretions of Matlab

    is Euler available to the general public? if so, can you provide a link to where i can find it (obviously if i search for Euler i will get webpages about the mathematician Euler)
    The pre-compiled publicly available distribution is available here

    RonL
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  2. #17
    Grand Panjandrum
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    Quote Originally Posted by CaptainBlack View Post
    I don't believe that Excell's solver assumes the objective is differentiable,
    (it's not a single algorithm but a suite IIRC) but it does help. Even if it does the
    optimisation algorithm in Euler uses the Nelder-Mead simplex algorithm that
    makes no such assumption.

    Also Simulated Annealing and similar methods will do the job.

    We will also need a penalty function added onto the objective to
    stop the frequencies going too high.

    RonL
    Sadly this does not work too well (at least for the test problem that I
    tried) too many local false minima.

    RonL
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  3. #18
    Senior Member tukeywilliams's Avatar
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    In my opinion, R is the best program for nonlinear regression and statistics in general.
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