On Wed, 2009-08-05 at 10:28 +1000, Remko Duursma wrote: > > Nice, but I need a few columns for the data. Don't know how to do this with > > the method you suggest. > > For each iteration, you make a vector of your 'data', in the example > it is a vector of length 3. > Each of the elements in this vector will become a column in the dataframe. > > If that is not what you mean, can you give a specific example? > > remko
If you know that there will be 10 rows then why not allocate the DF initially and fill in by row during the loop? nc <- 3 nr <- 10 df <- data.frame(matrix(NA, ncol = nc, nrow = nr)) for(i in seq_len(nr)) { ## Noah can fill in the "cells" as he goes with various results ## the below is just to illustrate df[i,1] <- rnorm(1) df[i,2] <- runif(1) df[i,3] <- rpois(1, 4) } df G > > > > > -N > > > > On 8/4/09 4:57 PM, Remko Duursma wrote: > >> > >> Hi Noah, > >> > >> there are a few ways to do this. Easiest is to keep adding an element > >> to a list, and then make it into a dataframe at the end, like this: > >> > >> resultlis<- list() > >> for(i in 1:10){ > >> > >> # your calculations here > >> datavec<- runif(3) > >> > >> resultlis[[i]]<- datavec > >> > >> } > >> resultdfr<- as.data.frame(do.call("rbind", resultlis)) > >> > >> > >> greetings, > >> Remko > >> > >> ------------------------------------------------- > >> Remko Duursma > >> Post-Doctoral Fellow > >> > >> Centre for Plants and the Environment > >> University of Western Sydney > >> Hawkesbury Campus > >> Richmond NSW 2753 > >> > >> Dept of Biological Science > >> Macquarie University > >> North Ryde NSW 2109 > >> Australia > >> > >> Mobile: +61 (0)422 096908 > >> www.remkoduursma.com > >> > >> > >> > >> On Wed, Aug 5, 2009 at 9:41 AM, Noah Silverman<n...@smartmediacorp.com> > >> wrote: > >> > >>> > >>> Hi, > >>> > >>> Time for another of my "newbie" questions. > >>> > >>> Is it possible to build up a data.frame "row by row" as I go > >>> > >>> I'm going to be running a bunch of experiments (many in a loop) to test > >>> different things. I'm using AUC as my main performance measure. > >>> > >>> My thought was to add a row to a data.frame for each iteration and then > >>> have > >>> a nice summary report at the end. > >>> > >>> I found how to import, export, and create from vectors. I haven't been > >>> able > >>> to find how just make an empty one and add rows as I go. > >>> > >>> ______________________________________________ > >>> 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. -- %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% Dr. Gavin Simpson [t] +44 (0)20 7679 0522 ECRC, UCL Geography, [f] +44 (0)20 7679 0565 Pearson Building, [e] gavin.simpsonATNOSPAMucl.ac.uk Gower Street, London [w] http://www.ucl.ac.uk/~ucfagls/ UK. WC1E 6BT. [w] http://www.freshwaters.org.uk %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%
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______________________________________________ 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.