Please use R's help resources before posting.
help.search("difference") will give you your answer (?diff).
-- Bert Gunter
Genentech
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of dott
Sent: Monday, August 11, 2008 8:27 AM
To: r-help@r-project.org
Subject: [R] R-help? how to take difference in next two elements
Hi,
I'd like to take difference for a sequence a between a_i and a_i-2, for
instance,
a<-c(2,3,4,8,1)
I need (2, 5, -3) as a result. If not using a for loop, can anyone help me?
Thanks a lot.
Dot
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______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
