Hi, I have a quit abstract problem, hope someone can help me here. I have a vector like this: x <- c(1,2,3,4,5,2,6) x [1] 1 2 3 4 5 2 6 now I want to get the number where the previous number is 1 and the next number is 3 (that is the 2 at the second place) I tried something with tail(x, -1) ... with that, I can check the next number, but how can I check the previous number?
comparing the previous and next entry of a vector to a criterium
2 messages · Jörg Groß, Kingsford Jones
How about: a <- c(1,2,3,3,2,1,6,3,2) b <- c(NA,a[-length(a)]) c <- c(a[-1],NA) a[b==1 & c==3] [1] 2 6 hth, Kingsford Jones
On Sun, Jan 25, 2009 at 3:02 PM, J?rg Gro? <joerg at licht-malerei.de> wrote:
Hi, I have a quit abstract problem, hope someone can help me here. I have a vector like this: x <- c(1,2,3,4,5,2,6) x [1] 1 2 3 4 5 2 6 now I want to get the number where the previous number is 1 and the next number is 3 (that is the 2 at the second place) I tried something with tail(x, -1) ... with that, I can check the next number, but how can I check the previous number?
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