Re: [R] a question about replacing the value in the data.frame

Thanks a lot! -- View this message in context: http://r.789695.n4.nabble.com/a-question-about-replacing-the-value-in-the-data-frame-tp2532010p2533036.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list ht

Re: [R] a question about replacing the value in the data.frame

Hello Karena, dat <- as.data.frame(matrix(sample(0:2, 400, replace = TRUE), ncol = 4000)) # if it is a data frame and has to stay that way # the option that comes to mind is apply() apply(dat, 2, function(x) {ifelse(x==2, 1, x)}) # if it can be or can be converted to a matrix dat2 <- as.matr