[R] computing differences between consecutive vector elements

From: Dewez Thomas <t.dewez_at_brgm.fr>
Date: Wed 28 Jul 2004 - 00:44:59 EST

Dear R-users,

I am a newbie to R so please excuse this naive question for which I couldn't seem to find online answers.

I have this data frame containing a series of locations through time
(x,y,z,t). I would like to compute the difference in x, y and z between t-1
and t.

Sounds easy enough, but how on earth does one loop through vector elements and compute this difference?


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