On Jun 1, 2011, at 5:07 PM, Salih Tuna wrote:
Hi,Is there a quick way of finding if numbers in a vector falls in between arange defined in another matrix. As an example let x y 0 1 3 2 6 9 25 15 18I want to check one by one whether 0,2 and 25 falls in any of the ranges iny. I am using 2 for loops but it is taking a huge amount of time. is there any other alternative way to do this?
If this represents the full complexity of the problem then findInterval would work:
> findInterval(c(0,2,25), c(1,3,6,9,15,18) ) %in% c(1,3,5) [1] FALSE TRUE FALSEOn the other hand if the y intervals overlap then a different method may be needed.
> sapply( c(0, 2, 25) , function(x) {any( y[,1] < x & x < y[,2]) })
[1] FALSE TRUE FALSE
--
David Winsemius, MD
West Hartford, CT
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