Re: Pade Approximation (further generalizations?---feature request)

• To: mathgroup at smc.vnet.net
• Subject: [mg109236] Re: Pade Approximation (further generalizations?---feature request)
• From: David Reiss <dbreiss at gmail.com>
• Date: Sun, 18 Apr 2010 05:59:04 -0400 (EDT)
• References: <hq414o\$3cd\$1@smc.vnet.net> <hq61q7\$3i8\$1@smc.vnet.net>

```On Apr 17, 6:05 am, David Reiss <dbre... at gmail.com> wrote:
> On Apr 16, 5:49 am, telefunkenvf14 <rgo... at gmail.com> wrote:
>
>
>
>
>
> > On Apr 14, 10:39 pm, David Reiss <dbre... at gmail.com> wrote:
>
> > > Another addition to the Pade Approximant function that would be very
> > > useful would be the generalized Pade Approximant: these are Pade
> > > Approximants that are based on more than one expansion point. I coded
> > > this up many years ago for some work in Radar propagation analysis
> > > (never published but I really should have...):
>
>
> > > more stuff on Radar is here...  which I really should do something
> > > commercial with sometime....
>
>
> > > --Davidhttp://scientificarts.com/worklife
>
> > > On Apr 14, 5:16 am, telefunkenvf14 <rgo... at gmail.com> wrote:
>
> > > > I've been playing around with PadeApproximant[] in Mathematica and =
have
> >  been really impressed at the accuracy of the approach.
>
> > > > According to Wikipedia:
>
> > > > A Pad=E9 approximant approximates a function in one variable. An
> > > > approximant in two variables is called a Chisholm approximant, in
> > > > multiple variables a Canterbury approximant (after Graves-Morris at
> > > > the University of Kent).
>
> > > > Does anyone know if v8 will include Chisholm and Canterbury
> > > > approximation?
>
> > > > -RG
>
> > Good timing! I actually came across a economics paper last night that
> > used Pade at more than one point, so it would be nice to see how this
> > could be coded in Mathematica.
>
> > Could you show me? (I understand if you don't want to, or if there are
> > too many other dependencies on other package functions.)
>
> > -RG
>
> Let me see if I can track it down and if it is actually usable out of
> its original context ...  it may not be pretty!  I've learned a lot i=
n
> the last 10 years!  A good place to read up on it though is in Bender
> and Orszag if my memory serves me right:
>
>
> --David

Alas, it was a rather rambling notebook with a special case
computation for the expansion of the solution of a particular
differential equation around several points.  So the code is not
usable by anyone else  --  and perhaps not me either anymore!
Notebook archeology....

```

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