Thank you for your response, here is a better example of what I am trying to do:
data(iris) index_setosa <- which(iris$Species == "setosa") iris_setosa <- data.frame() iris_setosa[index_setosa,] <-iris[index_setosa,] iris_others <- data.frame() iris_others[-index_setosa,] <- iris[-index_setosa,] So the idea would be that iris_setosa is a dataframe of size 150, with 50 observations of setosa, using their original same indices, and 100 observations of NA. Likewise iris_others would be 100 observations of species besides setosa, using their original indices, and there would be 50 NA's. The above doesn't work. When I execute it, I am left with iris_setosa having 0 columns, I wish it to have all the original columns of iris. That said, once I get past the above (being able to split them out and keep original indices), I wish to be able to combine iris_setosa and iris_others so that iris_combined is a data frame with no NA's and all the original data. Does this make sense? So I am basically taking a dataframe, splitting it based on some criteria, and working on the two split dataframes separately, and then I wish to recombine. Brian So at this point, I have iris_setosa a dataframe of size On Dec 1, 2012, at 11:34 PM, William Dunlap wrote: >> newdataset[testindex] = testset[testindex] >> object 'dataset' not found > > Is that really what R printed? I get >> newdataset[testindex] = testset[testindex] > Error in newdataset[testindex] = testset[testindex] : > object 'newdataset' not found > but perhaps you have a different problem. Copy and paste > (and read) the error message you got. > > Bill Dunlap > Spotfire, TIBCO Software > wdunlap tibco.com > > >> -----Original Message----- >> From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On >> Behalf >> Of Brian Feeny >> Sent: Saturday, December 01, 2012 8:04 PM >> To: r-help@r-project.org >> Subject: [R] How to re-combine values based on an index? >> >> I am able to split my df into two like so: >> >> dataset <- trainset >> index <- 1:nrow(dataset) >> testindex <- sample(index, trunc(length(index)*30/100)) >> trainset <- dataset[-testindex,] >> testset <- dataset[testindex,-1] >> >> So I have the index information, how could I re-combine the data using that >> back into a >> single df? >> >> I tried what I thought might work, but failed with: >> >> newdataset[testindex] = testset[testindex] >> object 'dataset' not found >> newdataset[-testindex] = trainset[-testindex] >> object 'dataset' not found >> >> Brian >> >> ______________________________________________ >> 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.