I think you want to do which(neilist %in% pfriends)
-----Original Message----- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of Thomas Sent: Tuesday, March 18, 2014 6:14 AM To: r-help@r-project.org Subject: [R] Which() missing a number Does anyone know why this is happening? Which() is picking up the indices of the numbers 13 and 15 in neilist, but it's missing out the 13 at index 6. Thank you, Thomas Chesney > neilist [1] 13 15 28 29 30 13 14 15 28 30 43 44 45 14 15 29 44 45 > pfriends [1] 13 15 > which(neilist==pfriends) [1] 1 2 8 > neilist[6] [1] 13 > str(neilist) int [1:18] 13 15 28 29 30 13 14 15 28 30 ... > str(pfriends) num [1:2] 13 15 > sessionInfo() R version 2.15.3 (2013-03-01) Platform: i386-apple-darwin9.8.0/i386 (32-bit) locale: [1] en_GB.UTF-8/en_GB.UTF-8/en_GB.UTF-8/C/en_GB.UTF-8/en_GB.UTF-8 attached base packages: [1] splines grid stats graphics grDevices utils datasets methods [9] base other attached packages: [1] spdep_0.5-56 coda_0.16-1 deldir_0.0-21 maptools_0.8-23 foreign_0.8-52 [6] nlme_3.1-108 MASS_7.3-23 Matrix_1.0-11 lattice_0.20-13 boot_1.3-7 [11] sp_1.0-8 igraph_0.6.5-1 loaded via a namespace (and not attached): [1] LearnBayes_2.12 tools_2.15.3 This message and any attachment are intended solely for the addressee and may contain confidential information. If you have received this message in error, please send it back to me, and immediately delete it. Please do not use, copy or disclose the information contained in this message or in any attachment. Any views or opinions expressed by the author of this email do not necessarily reflect the views of the University of Nottingham. This message has been checked for viruses but the contents of an attachment may still contain software viruses which could damage your computer system, you are advised to perform your own checks. Email communications with the University of Nottingham may be monitored as permitted by UK legislation. ______________________________________________ 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. ______________________________________________ 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.
