[Numpy-discussion] polyfit

Charles R Harris charlesr.harris at gmail.com
Wed Dec 18 17:51:40 EST 2013


On Wed, Dec 18, 2013 at 3:38 PM, Charles R Harris <charlesr.harris at gmail.com
> wrote:

>
>
>
> On Wed, Dec 18, 2013 at 3:23 PM, Alan G Isaac <alan.isaac at gmail.com>wrote:
>
>> For teaching it is certainly nice to have
>> numpy.polynomial.polynomial.polyfit
>> providing modern (vs. traditional) parameter order, but
>>
>> - it is rather buried
>> - np.polyfit uses traditional order and has the same name
>>
>> I recall there was some controversy (?) over all of this,
>> but might it not be appropriate to have a keyword argument to
>> both specifying whether the parameter order is to be modern
>> or traditional (in both polyfits and polyvals)?
>>
>> It would be messy, as there are a lot of functions in
> polynomial.polynomial that depend on the coefficient order. For the higher
> level Polynomial class, there is a routine in ipython that will do a pretty
> display of Polynomial instances which might be useful. Let's see... look
> here
> http://nbviewer.ipython.org/github/ipython/ipython/blob/master/examples/notebooks/Custom%20Display%20Logic.ipynband search the page for Polynomial.
>
>
Although beginning students might find the domain/window concept used in
Polynomial confusing... Strictly speaking, the polynomial should be
rendered as powers of ((x - off)/scale) if the domain differs from the
window.

Chuck
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