Hi there, Is this what you want?
your.number=5.43 # For a vector x=c(1,2,4,3,2,5,6,7,5.42,6) which.min(abs(x-your.number)) [1] 9 # For a matrix set.seed(123) X=matrix(rpois(100,4.5),ncol=10) apply(X,2,function(x) which.min(abs(x-your.number))) [1] 9 3 2 3 2 5 1 2 2 2 HTH, Jorge On Wed, Jul 9, 2008 at 11:28 AM, R_Learner <[EMAIL PROTECTED]> wrote: > > I have a long list of numbers [3.4,5.4,3.67,....], and I basically want to > find the index of the number closest to this number that I have, let's say > 5.43. How would I do this without writing a for loop (I have to do this > many > times for several lists)? Is there a "lookup" function in R? > > Thanks! > -- > View this message in context: > http://www.nabble.com/Find-the-closest-value-in-a-list-or-matrix-tp18363290p18363290.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help@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. > [[alternative HTML version deleted]] ______________________________________________ R-help@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.
