Hello, I have to construct 5 new columns in a data frame depending on the value of another of the columns in the data frame. The only way I could figure out to do this was to subset the data frame five times, do the variable construction, and then rbind the subsets back together. Here's part of the code I used:
read001 <- read[read$existstr=="001",] read001$era1end <- NA read001$era2base <- NA read001$era2end <- NA read001$era3base <- read001$era1base read001$era3end <- read001$era3base + (6 * read001$era3tr) read011 <- read[read$existstr=="011",] read011$era1end <- NA read011$era2base <- read011$era1base read011$era2end <- read011$era2base + (4 * read011$era2tr) read011$era3base <- read011$era2end read011$era3end <- read011$era2end + (6 * read011$era3tr) ... read2 <- rbind(read001, read011, read100, read110, read111) Isn't there an easier way to do this? Thanks. -- Stuart Luppescu <s...@ccsr.uchicago.edu> University of Chicago ______________________________________________ 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.
