From help-octave-request at bevo dot che dot wisc dot edu  Thu Jan 21 03:38:41 1999
Subject: Re: And some other simple questions
From: Daniel Heiserer <Daniel dot Heiserer at bmw dot de>
To: Vitaliy A Repin <vitaly at radio dot hop dot stu dot neva dot ru>,         "help-octave@bevo.che.wisc.edu" <help-octave@bevo.che.wisc.edu>
Date: Thu, 21 Jan 1999 10:32:36 +0100

Vitaliy A Repin wrote:
> 
> Hello!
> 
> Several simple questions:
> 
> 1) How can I compute the value $f(x)=Sum_{i=1}^{+\infty} some_func(i,x)$?
In general there' no way in octave. It is a numerical package.
You could try to loop throug a while and compare sum_(i) and sum_(i-1),
but you should be aware that this could be a catastrophy.
Theres no symbolic math in octave right now to do such things.
Use your math basics for converging series.

> 2) How can I compute the value $f(x)=\frac{d^n}{d\, x^n} g(x)$?
Well differentiate it by hand or use multiple finite differences (could
be poor).


daniel