[Numpy-discussion] why two versions of polyfit?

Charles R Harris charlesr.harris at gmail.com
Sun May 20 11:37:52 EDT 2012

On Sun, May 20, 2012 at 9:09 AM, Andreas Hilboll <lists at hilboll.de> wrote:

> Hi,
> I just noticed that there's two polyfit functions, one in
> numpy.lib.polynomial, and one in numpy.polynomial. What's the reason for
> this? The calling signatures aren't identical (the numpy.polynomial
> version supports weights), and I couldn't find a notice on why two
> versions exist.
There are two different polynomial objects, Polynomial and poly1d. The
Polynomial object is part of a newer group that also contains Lengendre,
Chebyshev, etc., and doesn't have some of the problems that poly1d has.
Poly1d is an older implementation.

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