[R] adding list to data.frame iteratively
Hi, I have a preallocated dataframe to which I have to add a list whose vectors will become rows in the dataframe. This is done iteratively. How can I do this? I'm dealing with very large numbers...list of 1000 vectors to a dataframe of 20 iteratively for e.g. my list is as follows ll-list(c(1,2,3),c(2,3,4)) I have to add this to a dataframe dd-data.frame(matrix(nrow=10,ncol=3)) so that I get 1 2 3 2 3 4 etc. [[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.
Re: [R] adding list to data.frame iteratively
ll-list(c(1,2,3),c(2,3,4)) ll [[1]] [1] 1 2 3 [[2]] [1] 2 3 4 dd-data.frame(matrix(nrow=10,ncol=3)) dd X1 X2 X3 1 NA NA NA 2 NA NA NA 3 NA NA NA 4 NA NA NA 5 NA NA NA 6 NA NA NA 7 NA NA NA 8 NA NA NA 9 NA NA NA 10 NA NA NA dd[1,]-ll[[1]] dd X1 X2 X3 1 123 2 NA NA NA 3 NA NA NA 4 NA NA NA 5 NA NA NA 6 NA NA NA 7 NA NA NA 8 NA NA NA 9 NA NA NA 10 NA NA NA dd[2,]-ll[[2]] dd X1 X2 X3 1 123 2 234 3 NA NA NA 4 NA NA NA 5 NA NA NA 6 NA NA NA 7 NA NA NA 8 NA NA NA 9 NA NA NA 10 NA NA NA you could easily put this into a for loop such that dd[i,]-ll[[i]] -- View this message in context: http://r.789695.n4.nabble.com/adding-list-to-data-frame-iteratively-tp2531124p2532154.html Sent from the R help mailing list archive at Nabble.com. __ 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.
Re: [R] adding list to data.frame iteratively
Hi, This is not exactly the same, but there was a recent thread on rbind()ing dataframes from a list: http://r.789695.n4.nabble.com/Please-explain-do-call-in-this-context-or-critique-to-stack-this-list-faster-td2526908.html Given that, I wonder if this would work for you: ll - list(c(1,2,3),c(2,3,4)) dd - data.frame(matrix(nrow=10,ncol=3)) # rbind() each element of the list together into a data frame temp - as.data.frame(do.call(rbind, ll), stringsAsFactors = FALSE) # assign that dataframe to whichever rows of dd you want dd[1:2, ] - temp # print to screen dd Just a thought, Josh On Tue, Sep 7, 2010 at 11:17 PM, raje...@cse.iitm.ac.in raje...@cse.iitm.ac.in wrote: Hi, I have a preallocated dataframe to which I have to add a list whose vectors will become rows in the dataframe. This is done iteratively. How can I do this? I'm dealing with very large numbers...list of 1000 vectors to a dataframe of 20 iteratively for e.g. my list is as follows ll-list(c(1,2,3),c(2,3,4)) I have to add this to a dataframe dd-data.frame(matrix(nrow=10,ncol=3)) so that I get 1 2 3 2 3 4 etc. [[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. -- Joshua Wiley Ph.D. Student, Health Psychology University of California, Los Angeles http://www.joshuawiley.com/ __ 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.
Re: [R] adding list to data.frame iteratively
Why don't you read the answers to your stackoverflow question? http://stackoverflow.com/questions/3665885/adding-a-list-of-vectors-to-a-data-frame-in-r/3667753 Hadley On Wed, Sep 8, 2010 at 1:17 AM, raje...@cse.iitm.ac.in raje...@cse.iitm.ac.in wrote: Hi, I have a preallocated dataframe to which I have to add a list whose vectors will become rows in the dataframe. This is done iteratively. How can I do this? I'm dealing with very large numbers...list of 1000 vectors to a dataframe of 20 iteratively for e.g. my list is as follows ll-list(c(1,2,3),c(2,3,4)) I have to add this to a dataframe dd-data.frame(matrix(nrow=10,ncol=3)) so that I get 1 2 3 2 3 4 etc. [[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. -- Assistant Professor / Dobelman Family Junior Chair Department of Statistics / Rice University http://had.co.nz/ __ 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.
