On Jun 10, 2009, at 1:28 PM, Eric Vander Wal wrote:
Thanks in advance.
I have a vector of numbers which contain sections that are sequences
which increase by a value of 1 followed by a gap in the data and
then another sequence occurs, etc:
x<-c(1:3, 6: 7, 10:13)
From the vector I need to extract 2 items of information A) the
first number in the sequence (e.g., 1, 6, 10) and B) how many
observations were in each sequence section (e.g., 3, 2, 4).
v1 v2
1 3
6 2
10 4
It seems simple, but my R skills are still in their infancy so I
very much appreciate the help.
Eric
Yet another solution:
> x[which(c(-Inf, diff(x)) != 1)]
[1] 1 6 10
> diff(c(which(c(-Inf, diff(x)) != 1), length(x)+1) )
[1] 3 2 4
--
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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