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How to generate a vector of counts i.e. the number of rows that are contiguous
2 messages · Ng Stanley, Gabor Grothendieck
See ?diff and ?which:
x <- c(18004, 18005, 18006, 18007, 18008, 18009, 18010, 18011,
+ 18012, 18013, 18014, 18017, 18060, 18061, 18062, 18063, + 18064, 18065, 18066)
diff(which(diff(c(-Inf, x, Inf)) != 1))
[1] 11 1 7
On Tue, Mar 11, 2008 at 10:37 AM, Ng Stanley <stanleyngkl at gmail.com> wrote:
Hi,
I have a 3 columns data and need to generate a vector of counts. These
counts are the number of rows that are contiguous. It looks easy for manual
counting, but to turn it algorithmic really split my head.
For example, 11 (i.e. 18004 to 180014), 1 (i.e., 18017), 7 (i.e., 18060 to
18064)
18004 10314568 0.5205757
18005 10333837 0.5135572
18006 10566333 0.5111271
18007 10566624 0.8196611
18008 10566629 0.8172404
18009 10567318 0.8148244
18010 11846564 0.8151912
18011 12308703 0.8151912
18012 12937846 0.6670504
18013 13318038 0.6733384
18014 13657045 0.6656946
18017 16200749 0.6173948
18060 23614276 0.7754780
18061 23676384 0.7781018
18062 23752656 0.7584247
18063 23804792 0.7389500
18064 23917628 0.7197741
18065 24397834 0.7008880
18066 24877926 0.6822831
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