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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