On Feb 17, 2011, at 10:36 AM, Maas James Dr (MED) wrote:
I'm using the range command to get the minimum and maximum values of
an array as in
x <- range(array_y)
which gives me two values such as
[1] -2 9
I need to be able to test if this range of values includes a third
value. For example I'd like to query
1) does the range of -2 to 9 include 3, answer TRUE
2) does the range of -2 to 9 include -6, answer FALSE?
All values could be negative or positive. Is there a R function
that will test this or do I need to programme it? I have searched
but not found one.
There is a function that handles intervals well, findInterval:
> findInterval(0, c(-2, 9))
[1] 1
> findInterval(-3, c(-2, 9))
[1] 0
> findInterval(10, c(-2, 9))
[1] 2
So:
isxInRange_y <- function(x, y) findInterval(x, range(y)) == 1
If you want to omit NA's which would otherwise poison the effort, you
need to wrap the y argument in na.omit().
--
David.
Thanks
J
===============================
Dr. Jim Maas
University of East Anglia
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