On Dec 2, 2009, at 9:34 AM, Hao Cen wrote:
Hi,
How can I find the index of the next largest element in a sorted
vector if
an element is not found.
for example, searching 2 in c(0,3,4) would return 1 since 2 is not
in the
vector and 0 is the next largest element to 2.
I tried which and match and neither returns such information.
which(c(0,3,4) == 2)
integer(0)
match(2, c(0,3,4))
[1] NA
Take a look at these. I changed to problem so that the "answer would
be in the middle of the sequence.
> which(c(0,3,4) <= 2)
[1] 1 # but which would have retruned several values if the match
were in the middle
> which(c(-3,-1, 0,3,4) <= 2)
[1] 1 2 3
> tail(which(c(-3,-1,0,3,4) <= 2),1)
[1] 3 # the desired index
--
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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