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## Fwd: operator concept in Octave?

 From: Jordi Gutierrez Hermoso Subject: Fwd: operator concept in Octave? Date: Sat, 9 Dec 2006 15:22:57 -0600

```Siegfried has asked me to forward to the Octave mailing lists his
obstacle for being able to contribute to Octave useful M**TLAB code of
his. His code can be found in his homepage listed below.

- Jordi G. H.

---------- Forwarded message ----------
Date: 09-Dec-2006 15:11
Subject: Re: operator concept in Octave?

Am 10.12.2006, 04:20 Uhr, schrieb Jordi Gutierrez Hermoso

```
```On 09/12/06, Siegfried M. Rump <address@hidden> wrote:
```
```thank you very much for your quick answer. Too bad Octave does
support user-defined operators.

There are numerous applications, for example the derivative p'
for polynomial p, [L1,L2] to form lists, a*b for quaternions,
a+b for intervals, automatic differentiation and so forth.
All mentioned can easily be written in Matlab.

In fact I am asking for my Matlab interval toolbox INTLAB. It
defines real and complex intervals, automatic differentiation
for gradients and hessians, polynomials, a long arithmetic,
slopes and more.

It has some 4000 users in more than 40 countries and I was
asked whether it is also running in Octave. If at some time
you decide to support operators, please let me know, I would
be happy to use Octave since Matlab is getting increasingly
expensive.
```
```
Perhaps you would like to post these thoughts to the Octave mailing
list? Perhaps you'll spur someone's interest to allow operator
overloading if you tell them that you could contribute useful code to
Octave if this feature were enabled.

- Jordi G. H.
```
```

Plese do so! The INTLAB code is on my homepage

www.ti3.tu-harburg.de

Believe me, there are numerous applications and packages using
Matlab's operator concept. Handling is, as always, extremely simple.

Best wishes

Siegfried M. Rump

--
=====================================================
Prof. Dr. Siegfried M. Rump
Institute for Reliable Computing
Hamburg University of Technology
Schwarzenbergstr. 95
21071 Hamburg
Germany
phone  +49 40 42878 3027
fax    +49 40 42878 2489
http://www.ti3.tu-harburg.de

and

Visiting Professor at Waseda University
Faculty of Science and Engineering
Shinjuku Lambdax Bldg. 902
2-4-12 Okubo, Shinjuku-ku
Tokyo 169-0072
Japan
phone/fax in Japan  +81 3 5286 3414

```