On Wed, Aug 3, 2011 at 8:09 AM, zcatav <zca...@gmail.com> wrote: > Your suggestion works perfect as i pointed previous message. Now have another > question about data editing. I try this code: > X[X[,"c"]==1,"b"]<-X[,"d"] > and results with error: `[<-.data.frame`(`*tmp*`, X[, "c"] == 1, "b", value > = c(NA, : > replacement has 9 rows, data has 2 > > Logically i selected 2 rows with X[,"c"]==1. Than i want to replace in that > rows its own data from "d" to "b" with X[,"b"]<-X[,"d"]. What is wrong? >
Also check out transform and ifelse, e.g. transform(X, b = ifelse(is.na(b) & c == 0, "2011-07-28", b)) transform(X, b = ifelse(c == 1, d, c)) -- Statistics & Software Consulting GKX Group, GKX Associates Inc. tel: 1-877-GKX-GROUP email: ggrothendieck at gmail.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.