Using vector and array indexes with zeros works for extraction and for replacement in the case of a vector, list and matrix but for a data frame only extraction works. All lines below give the expected answer except the last line which gives the error message shown.
v <- 1:5 L <- as.list(v) m <- cbind(a = 11:15, b = 21:25) DF <- as.data.frame(m) ix <- c(1, 0, 2) v[ix] L[ix] m[cbind(1:3, ix)] DF[cbind(1:3, ix)] v[ix] <- 99:100 L[ix] <- 99:100 m[ix, ] DF[ix, ] m[cbind(1:3, ix)] <- 99:100 DF[cbind(1:3, ix)] <- 99:100 ## Error in `[<-.data.frame`(`*tmp*`, cbind(1:3, ix), value = 99:100) : ## 'value' is the wrong length ## In addition: Warning message: ## In `[<-.data.frame`(`*tmp*`, cbind(1:3, ix), value = 99:100) : ## number of items to replace is not a multiple of replacement length -- Statistics & Software Consulting GKX Group, GKX Associates Inc. tel: 1-877-GKX-GROUP email: ggrothendieck at gmail.com ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
