Steven I think list() can help you
########################################## indlist = list() for (i in 1:(dim(x)[2])) { indlist[[paste("ind", i, sep = "")]] <- which(x[ , i] == "y") } accum = unlist(indlist) print(indlist$ind1) ########################################### Schalk Heunis On Fri, Sep 11, 2009 at 7:52 AM, Steven Kang <stochastick...@gmail.com> wrote: > Dear R users, > > > I would like to accumulate objects generated from 'for' loop to a list or > array. > > To illustrate the problem, arbitrary data set and script is shown below, > > > x <- data.frame(a = c(rep("n",3),rep("y",2),rep("n",3),rep("y",2)), b = > c(rep("y",2),rep("n",4),rep("y",3),"n"), c = c(rep("n",7),rep("y",3)), d = > c("y", rep("n",4), rep("y",2), rep("n",3))) > > for (i in 1:(dim(x)[2])) { > assign(paste("ind", i, sep = ""), which(x[ , i] == "y")) > accum <- c(ind1, ind2, ind3, ind4) > } > >> ind1 > [1] 4 5 9 10 >> ind2 > [1] 1 2 7 8 9 >> ind3 > [1] 8 9 10 >> ind4 > [1] 1 6 7 >> accum > [1] 4 5 9 10 1 2 7 8 9 8 9 10 1 6 7 > > Are there any alternative method where the highlighted statement above can > be represented without typing individual objects manually? (as it can be > very tedious with large number of objects; i.e ind1, ind2, ....., ind100) > > Also, is there any way to extract individual objects ('ind1' etc) from > 'accum'? > >> accum[1:length(ind1)] > [1] 4 5 9 10 > gives 'ind1', but this may become messy for other objects (like 'ind10') > > > Highly appreciate for sharing your expertise in solving this problem. > > [[alternative HTML version deleted]] > > ______________________________________________ > 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. > ______________________________________________ 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.