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## RE: Rational functiion manipulation

**From**: |
Junkichi Sugita |

**Subject**: |
RE: Rational functiion manipulation |

**Date**: |
Mon, 4 Dec 2006 17:30:18 +0900 |

Jordi,
Thank you for responding.
Yes, sort of symbolic manipulation, but not so complicated.
Anyway I managed to code one myself, which is far from complete
for handling a rational function as attached.
But it is sufficient for my present purpose (mainly integrating
transfer functions to evaluate noise in an electronic circuit.)
Junkichi Sugita
-----Original Message-----
From: Jordi Gutierrez Hermoso [mailto:address@hidden
Sent: Monday, December 04, 2006 7:55 AM
To: Junkichi Sugita
Cc: address@hidden
Subject: Re: Basic editing in Octave under Windows environment
On 30/11/06, Junkichi Sugita <address@hidden> wrote:
>* Does OCTAVE have capabilities to manipulate a rational function (i.e. a*
>* polynomial divided by another)?*
Well, GNU Octave knows IEEE arithmetic, and you can easily write a
script or function file that returns the values of a rational function
at a given point...
But if what you want is to symbolically manipulate rational functions,
then Octave probably isn't the right tool for the job. Try Maxima or
Axiom for that.
>* Is there any OCTAVE function to provide a variable-substituted*
>* rational/polynomial function of P(s) with "s" substituted by e.g. "j*f" or*
>* "1/f"?*
There are hacks to accomplish this sort of behaviour, but it sounds
like you want symbolic manipulations. Octave is not made for this.
HTH,
- Jordi G. H.

**
**`rationalm.m`

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