From r.hankin at noc.soton.ac.uk  Tue Jul 25 11:08:32 2006
From: r.hankin at noc.soton.ac.uk (Robin Hankin)
Date: Tue, 25 Jul 2006 10:08:32 +0100
Subject: [Rd] pari/gp interface
Message-ID: <996C788E-4632-4BB5-A9F4-83AB02C0CE3D@soc.soton.ac.uk>

Hi

I'm developing an R package that
needs to execute some code written in pari/gp.

I've used this before from an R package (elliptic) but the interface  
is very
basic: the R function creates a string such as the following:

string <- echo ' ellwp ([ 2+0*I , 0+2*I ], 1+0*I )' | gp -q

And then

system(string)

returns the output from gp which then needs to be text processed  
(translating "I"
to "i", etc).

I don't think this approach would work under Windows.

Does anyone have any experience of calling pari/gp from R?

Or any ideas for a more portable method than the one above?




[
PARI/GP is a widely used computer algebra system designed for fast  
computations
in number theory.  It is freely available at

  http://pari.math.u-bordeaux.fr/
]


--
Robin Hankin
Uncertainty Analyst
National Oceanography Centre, Southampton
European Way, Southampton SO14 3ZH, UK
  tel  023-8059-7743



[Rd] pari/gp interface
Robin Hankin