?which
A <- c(1,2,3,4)
B <- c(0,3,1,5)
which(A<B)
max(which(A<B))
[1] 4
- Phil Spector
Statistical Computing Facility
Department of Statistics
UC Berkeley
spec...@stat.berkeley.edu
On Mon, 18 Apr 2011, Chee Chen wrote:
Dear All,
I would like to ask a question about how to locate the indices after comparing
two numeric vectors.
Say, I have, A <- c(1,2,3,4) and A <- c(0,3,1,5)
and we cmpare:
idx <- A<B
So:
idx
[1] FALSE TRUE FALSE TRUE
Question 1:
I would like to get a vector that stores the indices for entries of A such that
this relationship is true. In this case,
a vector idx1 < c(2,4), because the 2nd and 4th entries of A satisfy the
conditions
Question 2:
I would like to know the maximum index of the entry in A for which the
relationship is true. In this case,
max_indx = 4, since the 4th entry of A is such.
Could you please give me some hints?
Thank you,
-Chee
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