[Numpy-discussion] poly class question
Charles R Harris
Fri Oct 2 12:35:48 CDT 2009
On Fri, Oct 2, 2009 at 11:33 AM, Charles R Harris <email@example.com
> On Fri, Oct 2, 2009 at 11:30 AM, Charles R Harris <
> firstname.lastname@example.org> wrote:
>> On Fri, Oct 2, 2009 at 11:08 AM, <email@example.com> wrote:
>>> Is there a way in numpy (or scipy) to get an infinite expansion for
>>> the inverse of a polynomial (for a finite number of terms)
>>> np.poly1d([ -0.8, 1])**(-1)
>>> application for example the MA representation of an AR(1)
>> Hmm, I've been working on a chebyshev class and division of a scalar by a
>> chebyshev series is
>> expressly forbidden, but it could be included if a good interface is
>> proposed. Same would go for polynomials.
> In fact is isn't hard to get, for poly1d you should be able to multiply the
> series by a power of x to shift it left, then divide.
That is, divide a power of x by the polynomial.
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