Hi R Users, I have been trying to work out how to rename column names using grep, basically I have generated these column names using tapply:
[1] "NAME" "X1.1" "X2.1" "X3.1" "X4.1" "X5.1" "X6.1" "X7.1" "X8.1" [10] "X1.2" "X2.2" "X3.2" "X4.2" "X5.2" "X6.2" "X7.2" "X8.2" "X1.3" [19] "X2.3" "X3.3" "X4.3" "X5.3" "X6.3" "X7.3" "X8.3" "X1.5" "X2.5" [28] "X3.5" "X4.5" "X5.5" "X6.5" "X7.5" "X8.5" "X1.6" "X2.6" "X3.6" [37] "X4.6" "X5.6" "X6.6" "X7.6" "X8.6" "X1.8" "X2.8" "X3.8" "X4.8" [46] "X5.8" "X6.8" "X7.8" "X8.8" "X1.9" "X2.9" "X3.9" "X4.9" "X5.9" [55] "X6.9" "X7.9" "X8.9" "X1.10" "X2.10" "X3.10" "X4.10" "X5.10" "X6.10" [64] "X7.10" "X8.10" "X1.12" "X2.12" "X3.12" "X4.12" "X5.12" "X6.12" "X7.12" [73] "X8.12" "X1.13" "X2.13" "X3.13" "X4.13" "X5.13" "X6.13" "X7.13" "X8.13" [82] "X1.14" "X2.14" "X3.14" "X4.14" "X5.14" "X6.14" "X7.14" "X8.14" "X1.15" [91] "X2.15" "X3.15" "X4.15" "X5.15" "X6.15" "X7.15" "X8.15" "X1.16" "X2.16" [100] "X3.16" "X4.16" "X5.16" "X6.16" "X7.16" "X8.16" "X1.17" "X2.17" "X3.17" [109] "X4.17" "X5.17" "X6.17" "X7.17" "X8.17" "X1.18" "X2.18" "X3.18" "X4.18" [118] "X5.18" "X6.18" "X7.18" "X8.18" "X1.19" "X2.19" "X3.19" "X4.19" "X5.19" [127] "X6.19" "X7.19" "X8.19" "X1.20" "X2.20" "X3.20" "X4.20" "X5.20" "X6.20" [136] "X7.20" "X8.20" "X1.21" "X2.21" "X3.21" "X4.21" "X5.21" "X6.21" "X7.21" [145] "X8.21" "X1.22" "X2.22" "X3.22" "X4.22" "X5.22" "X6.22" "X7.22" "X8.22" [154] "X1.23" "X2.23" "X3.23" "X4.23" "X5.23" "X6.23" "X7.23" "X8.23" "X1.24" [163] "X2.24" "X3.24" "X4.24" "X5.24" "X6.24" "X7.24" "X8.24" "X1.25" "X2.25" [172] "X3.25" "X4.25" "X5.25" "X6.25" "X7.25" "X8.25" "X1.26" "X2.26" "X3.26" [181] "X4.26" "X5.26" "X6.26" "X7.26" "X8.26" "X1.27" "X2.27" "X3.27" "X4.27" [190] "X5.27" "X6.27" "X7.27" "X8.27" "X1.28" "X2.28" "X3.28" "X4.28" "X5.28" [199] "X6.28" "X7.28" "X8.28" "X1.29" "X2.29" "X3.29" "X4.29" "X5.29" "X6.29" [208] "X7.29" "X8.29" "X1.30" "X2.30" "X3.30" "X4.30" "X5.30" "X6.30" "X7.30" [217] "X8.30" "X1.31" "X2.31" "X3.31" "X4.31" "X5.31" "X6.31" "X7.31" "X8.31" [226] "X1.32" "X2.32" "X3.32" "X4.32" "X5.32" "X6.32" "X7.32" "X8.32" "X1.33" [235] "X2.33" "X3.33" "X4.33" "X5.33" "X6.33" "X7.33" "X8.33" What the names mean are behaviour.day the X is not important to the data, it is the numbers I am trying to select on. So I want to split the data by day i.e. selecting for the number after the decimal. I am using this code (where scananal is the data) with out looping so the number following the decimal I change manually (NB the data have been changed to character): DAY <- grep("(X[[:digit:]]+).3",colnames(scananal)) However, this will select for day 3, 30, 31, 32, etc I have tried to use fixed = TRUE, but that just returns integer(0). But if I use 30, it will select only 30. Not sure what I'm doing wrong here, and I assumed that fixed = T would fix this, but doesn't. I have tried to loop this too, but with no luck, so if anyone can point me in the right direction about how to loop using grep I would be most grateful! The main problem I have is where to put the loop, for example: for(i in 1:33){ print(i) DAY[[i]] <- grep("(X[[:digit:]]+).[[i]]",colnames(scananal)) } which doesn't work, and no doubt there are obvious reasons for this! Any help would be much appreciated, All the best, Ross -- View this message in context: http://r.789695.n4.nabble.com/grep-problem-decimal-points-looping-tp2319773p2319773.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.