[R] "diff"^-1

[kjetil@entelnet.bo]

On 13 Apr 2004 at 18:58, michele lux wrote:

> Hallo all
> somebody knows if exist a command who makes the
> opposite of what "diff" command do?
> I'he to write code?
> thanks Michele
> 

As other responses has shown, your Q could have been clearer!

?diffinv

note that this is not really an inverse, as the following shows:

> diffinv(diff(1:10))
 [1] 0 1 2 3 4 5 6 7 8 9

If you know the first element of your original series, you can do:

> diffinv(diff(3:13), xi=3)
 [1]  3  4  5  6  7  8  9 10 11 12 13

Kjetil Halvorsen

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