Good morning. Novice usR. Here.
I am following this string, among many, learning as I go. Quick question please? I thought that perhaps ata.frame was part of the zoo pkg, b/c when I searched it came up in help? However, evidently not or I am not using it properly. Please advise, thank you. x <- list(A=data.frame(x=1:2, y=3:4),B=data.frame(x=5:6,y=7:8)) x2 <- do.call(rbind, lapply(names(x), function(z) ata.frame(type=z, dat[[z]]))) #Error in ata.frame(type = z, dat[[z]]) : could not find function "ata.frame" ?ata.frame ??ata.frame #Looks like it's part of the zoo package? install.packages("zoo") #Typo: dat[[z]] should be x[[z]]: x <- list(A=data.frame(x=1:2, y=3:4),B=data.frame(x=5:6,y=7:8)) x2 <- do.call(rbind, lapply(names(x), function(z) ata.frame(type=z, x[[z]]))) #Error in ata.frame(type = z, dat[[z]]) : still cannot find function "ata.frame"? William H. Poling, Ph.D. From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Huzefa Khalil Sent: Wednesday, May 02, 2018 1:24 PM To: Kevin E. Thorpe <kevin.tho...@utoronto.ca> Cc: R Help Mailing List <r-help@r-project.org> Subject: Re: [R] Converting a list to a data frame Hi Kevin, There is probably a better way, but it can be done in two steps like this temp <- list(A=data.frame(x=1:2, y=3:4),B=data.frame(x=5:6,y=7:8)) temp <- lapply(names(temp), function(n, temp) { temp[[n]]$type <- n return(temp[[n]]) }, temp = temp) do.call(rbind, temp) On Wed, May 2, 2018 at 1:11 PM, Kevin E. Thorpe <kevin.tho...@utoronto.ca<mailto:kevin.tho...@utoronto.ca>> wrote: > I suspect this is pretty easy, but I'm having trouble figuring it out. > Basically, I have a list of data frames such as the following example: > > list(A=data.frame(x=1:2, y=3:4),B=data.frame(x=5:6,y=7:8)) > > I would like to turn this into data frame where the list elements are > essentially rbind'ed together and the element name becomes a new variable. > For example, I would like to turn the list above into a data frame that > looks like this: > > data.frame(type=c("A","A","B","B"),x=c(1:2,5:6),y=c(3:4,7:8)) > > Appreciate any pointers. > > Kevin > > -- > Kevin E. Thorpe > Head of Biostatistics, Applied Health Research Centre (AHRC) > Li Ka Shing Knowledge Institute of St. Michael's Hospital > Assistant Professor, Dalla Lana School of Public Health > University of Toronto > email: kevin.tho...@utoronto.ca<mailto:kevin.tho...@utoronto.ca> Tel: > 416.864.5776 Fax: 416.864.3016 > > ______________________________________________ > R-help@r-project.org<mailto:R-help@r-project.org> mailing list -- To > UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help<https://stat.ethz.ch/mailman/listinfo/r-help> > PLEASE do read the posting guide > http://www.R-project.org/posti<http://www.R-project.org/posti> > ng-guide.html > and provide commented, minimal, self-contained, reproducible code. > [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org<mailto:R-help@r-project.org> mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help<https://stat.ethz.ch/mailman/listinfo/r-help> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html<http://www.R-project.org/posting-guide.html> and provide commented, minimal, self-contained, reproducible code. Confidentiality Notice This message is sent from Zelis. ...{{dropped:15}} ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.