comparing the previous and next entry of a vector

Sun, Jan 25, 2009 2:29 PM

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?

Thread (7 messages)

Jörg Groß comparing the previous and next entry of a vector Jan 25 Gabor Grothendieck comparing the previous and next entry of a vector Jan 25 Jörg Groß comparing the previous and next entry of a vector Jan 25 (Ted Harding) comparing the previous and next entry of a vector Jan 25 Marc Schwartz comparing the previous and next entry of a vector Jan 25 Gabor Grothendieck comparing the previous and next entry of a vector Jan 25 Jorge Ivan Velez comparing the previous and next entry of a vector Jan 25