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RE: [Axiom-developer] Re: Axiom + High Energy Physics

From: Bill Page
Subject: RE: [Axiom-developer] Re: Axiom + High Energy Physics
Date: Thu, 10 Nov 2005 21:11:19 -0500

On November 10, 2005 8:16 PM Tim Daly wrote:
> well, i don't plan to rewrite EVERYTHING in lisp, despite what I
> told Bill,


> although in principle you can generate machine-instruction
> equivalent routines from lisp. Before we gave the system to NAG
> we worked with them to generate an Axiom-Fortran interface which
> still exists in the code. I'd like to keep it compatible with the
> NAG library but i don't have access to that anymore.

>From a quick look at the NAG routines that are not compiled in the
current open source release it looked to me like these assumed
that these numeric calculations were performed by a separate server
program that communicates with Axiom through sockets. Am I right
about this, Tim?

If that is the case, then what one would need to do in order to
retain the NAG Axiom coding in it's current form would be to write
a new numeric server program which would call open source math
library routines to perform equivalent functions. Of course such
a program could be written in any convenient language, e.g. C or
even Fortran (post 2000 version please!).

In principle such a design seems to make sense because it allows
some parallelism and also provides the numeric routines with their
own address space. This also allows the conversion to and from
Axiom data structures to native (Fortran?) data structures to be
centralized and done as efficiently as possible.

Of course it is also possible to interface with external programs
from Axiom in more high level ways such as Martin Rubey's interface
to Polymake which is written entirely in Spad and communicates
simply through files.

For example one might create such an interface for Octave or even
Cactus if you are into that
kind of thing. The main problem has to do with converting to and
from Axiom's internal data structures and the simplest place to do
that is in Spad (or Aldor).

Bill Page.

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