Thank you I believe that is just what I was looking for.

Brian

On Dec 2, 2012, at 12:37 AM, Berend Hasselman [via R] <ml-node+s789695n4651599h74@n4.nabble.com> wrote:

> 
> On 02-12-2012, at 06:06, Brian Feeny wrote: 
> 
> > Thank you for your response,  here is a better example of what I am trying to do: 
> > 
> > data(iris) 
> > index_setosa <- which(iris$Species == "setosa") 
> > iris_setosa <- data.frame() 
> > iris_setosa[index_setosa,] <-iris[index_setosa,] 
> > iris_others <- data.frame() 
> > iris_others[-index_setosa,] <- iris[-index_setosa,] 
> > 
> 
> Change you example to make it actually do something 
> 
> data(iris) 
> index_setosa <- which(iris$Species == "setosa") 
> iris_setosa <-iris[index_setosa,] 
> head(iris_setosa) 
> 
> # iris_others <- data.frame() 
> # iris_others[-index_setosa,] <- iris[-index_setosa,] 
> iris_others <- iris[-index_setosa,] 
> head(iris_others) 
> tail(iris_others) 
> 
> The head() and tail() calls are for checking. 
> Combine the two like this 
> 
> z <- rbind(iris_setosa,iris_others) 
> head(z) 
> tail(z) 
> 
> Berend 
> 
> > 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: [hidden email] [mailto:[hidden email]] On Behalf 
> >>> Of Brian Feeny 
> >>> Sent: Saturday, December 01, 2012 8:04 PM 
> >>> To: [hidden email] 
> >>> 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 
> >>> 
> >>> ______________________________________________ 
> >>> [hidden email] 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. 
> > 
> > ______________________________________________ 
> > [hidden email] 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.
> 
> ______________________________________________ 
> [hidden email] 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. 
> 
> 
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