?deltat On Sun, Oct 12, 2008 at 9:45 AM, Oliver Bandel <[EMAIL PROTECTED]> wrote: > Zitat von Gabor Grothendieck <[EMAIL PROTECTED]>: > >> 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 >
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