Hello all,
Is there an efficient way to simplify the loop over the 3rd dimension of a 3D array ? I want to keep the loop over the "time". Here is the code: set.seed(12345) ind <- 10 time_seq <- seq(0, 8, 1) col_array <- c(paste("time_", time_seq, sep="")) tab <- array(0, dim=c(length(time_seq) , length(col_array), ind), dimnames=list(NULL, col_array, as.character(seq(1, ind, 1)))) print(tab) tab[1,c("time_0"),] <- round(runif(ind, 0, 100)) print(tab) for(time in 1:(length(time_seq) - 1)){ for(i in 1:ind){ tab[time + 1,c("time_0"),i] <- round(runif(1, 0, 100)) tab[time + 1,c("time_1"),i] <- tab[time,c("time_0"),i] tab[time + 1,c("time_2"),i] <- tab[time,c("time_1"),i] tab[time + 1,c("time_3"),i] <- tab[time,c("time_2"),i] tab[time + 1,c("time_4"),i] <- tab[time,c("time_3"),i] tab[time + 1,c("time_5"),i] <- tab[time,c("time_4"),i] tab[time + 1,c("time_6"),i] <- tab[time,c("time_5"),i] tab[time + 1,c("time_7"),i] <- tab[time,c("time_6"),i] tab[time + 1,c("time_8"),i] <- tab[time,c("time_7"),i] } } print(tab) In fact, the array has 800000 observations for the 3rd dimension. Many thanks for your time Have a great day Marine [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.