[Numpy-discussion] why two versions of polyfit?

Charles R Harris charlesr.harris at gmail.com
Sun May 20 11:41:56 EDT 2012

On Sun, May 20, 2012 at 9:37 AM, Charles R Harris <charlesr.harris at gmail.com
> wrote:

> 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.

Oh, and the polyfit function in polynomial.polynomial isn't meant to be
used directly, it is mostly there to support the fit class function of
Polynomial. See the documentation here <http://preview.tinyurl.com/8289gfs>.

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