Re: fmin_powell returns incorrect parameters for simple least-squares problem

On Wed, Mar 1, 2023 at 10:30 AM Matthew Brett <[email protected]>
wrote:

>
> I think I'm right that we've had our own custom implementation of
> Powell for a very long time - it looks to me (from git blame) that
> Travis O put a version of the current code in with commit b94c30dcb
> (April 2002).
>

For what it's worth, it's not so much "our own custom implementation" so
much as following a particular published variant that was explained (but
not originally published in) *Numerical Recipes*. Interestingly, that
chapter claims that the modification is to assist Powell's method in
handling long skinny valleys.

-- 
Robert Kern

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