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Re: rational numbers only

From: Paul Kienzle
Subject: Re: rational numbers only
Date: Thu, 5 Jan 2006 20:48:27 -0500

On Jan 5, 2006, at 4:46 PM, John W. Eaton wrote:

On  5-Jan-2006, Jordi Gutierrez Hermoso wrote:

| On 1/5/06, Jorge Barros de Abreu <address@hidden> wrote:
| > Hi.
| >
| > ?????Which the variable name that force maxima to work with ratonal numbers
| > only???
| Octave really isn't built for that kind of operations. There are
| functions that do it as other people in this thread have mentioned,
| but if you want a symbolic calculator, you're better off using a
| dedicated CAS like Maxima or YACAS.

You could also write a new user-defined data type for rational
numbers.  Simple arithmetic for scalars and maybe even matrices would
not be too hard.  But unless there are existing libraries for other
operations, it would be a lot of work to get something like svd of a
rational matrix working (if that would even make sense).

tnt+jama provide template based SVD, QR, LU, EIG and CHOL.

I had to do some mods to make it accept 100 digit floats, but these should also work for a rational type. Anyone who wants to work on this (e.g., for vpa support) should let me know and I can send the patches.

- Paul

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