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fine
2010 Dec 09
1
how to use diff() with different variables?
...'data.frame': 3 obs. of 2 variables:
$ x : Factor w/ 3 levels "A","B","C": 1 2 3
$ fine: POSIXct, format: "2010-12-09 07:57:33" "2010-12-09 08:05:00" "2010-12-08 20:42:00"
What I am trying to do is to build another variable fine1 that should contain the lagged value for "fine", that is:
x fine fine1
1 A 2010-12-09 07:57:33 NA
2 B 2010-12-09 08:05:00 2010-12-09 07:57:33
3 C 2010-12-08 20:42:00 2010-12-09 08:05:00
How can I do that?
Thanks,
Luca
Luca Meyer
www.lucameyer.com
IBM SP...