Hi I have a sorted array ( in ascending order) and I want to find the subscript of a number in the array which is the the next highest number to a given number. For example,if I have 67 as a given number and if I have a vector x=c(23,36,45,62,79,103,109), then how do I get the subscript 5 from x (to get 79 which is the next highest to 67) without using a for loop? Thx -- 'Raghu' [[alternative HTML version deleted]]
a couple of the many possible ways are: x <- c(23,36,45,62,79,103,109) thr <- 67 x[x > thr][1] head(x[x > thr], 1) I hope it helps. Best, Dimitris On 7/28/2010 12:12 PM, Raghu wrote:> Hi > > I have a sorted array ( in ascending order) and I want to find the subscript > of a number in the array which is the the next highest number to a given > number. For example,if I have 67 as a given number and if I have a vector > x=c(23,36,45,62,79,103,109), then how do I get the subscript 5 from x (to > get 79 which is the next highest to 67) without using a for loop? > > Thx >-- Dimitris Rizopoulos Assistant Professor Department of Biostatistics Erasmus University Medical Center Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands Tel: +31/(0)10/7043478 Fax: +31/(0)10/7043014
... just a note: you don't have to first sort the vector to do this:> x <- sample(1:7) > x[1] 3 5 7 6 2 4 1> which(x==min(x[x>4]))[1] 2 Bert Gunter Genentech Nonclinical Biostatistics On Wed, Jul 28, 2010 at 3:12 AM, Raghu <r.raghuraman at gmail.com> wrote:> Hi > > I have a sorted array ( in ascending order) and I want to find the subscript > of a number in the array which is the the next highest number to a given > number. For example,if I have 67 as a given number and if I have a vector > x=c(23,36,45,62,79,103,109), then how do I get the subscript 5 from x (to > get 79 which is the next highest to 67) without using a for loop? > > Thx > > -- > 'Raghu' > > ? ? ? ?[[alternative HTML version deleted]] > > ______________________________________________ > R-help at r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. >