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## Re: And some other simple questions

 From: Daniel Heiserer Subject: Re: And some other simple questions 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