[R] numeric derivation

[Oliver Bandel]

Zitat von Gabor Grothendieck <ggrothendieck at gmail.com>:

> If you simply want successive differences use diff:
>
> x <- seq(4)^2
> diff(x)
>
> tx <- ts(x)
> diff(tx)
[...]

Oh, cool, thanks.

But what about  diff / delta_t ?

Do I have to calculate it by my own, or is there
already a function for making a difference-qoutient?

This would be fine to have, because for example
coming from space vs. time to velocity vs. time
and acceleration vs. time (and further derivatives)
are also a time-series.

The possibility of using the advantages of the time series class here,
would be fine.


Ciao,
   Oliver