Salih Tuna
2011-Jun-24 08:57 UTC
[R] Fastest way of finding if any members of vector x fall in the range of the rows of matrix y
Hi All, What is the fastest way of finding if any members of vector x fall in the range of the rows of matrix y? I do not want to use two for loops as this will take forever. Any help will be appreciated, best, salih [[alternative HTML version deleted]]
Dimitris Rizopoulos
2011-Jun-24 09:23 UTC
[R] Fastest way of finding if any members of vector x fall in the range of the rows of matrix y
One approach is the following: x <- rnorm(5) y <- matrix(rnorm(5*2), 5, 2) check <- y - x check[, 1] * check[, 2] < 0 I hope it helps. Best, Dimitris On 6/24/2011 10:57 AM, Salih Tuna wrote:> Hi All, > What is the fastest way of finding if any members of vector x fall in the > range of the rows of matrix y? > I do not want to use two for loops as this will take forever. > Any help will be appreciated, > best, > salih > > [[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. >-- 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 Web: http://www.erasmusmc.nl/biostatistiek/