David, the other.
>
> David C
>
> -----Original Message-----
> From: R-help <r-help-bounces at r-project.org> On Behalf Of David L Carlson
> Sent: Wednesday, May 2, 2018 3:51 PM
> To: William Dunlap <wdunlap at tibco.com>; Kevin E. Thorpe <kevin.thorpe at utoronto.ca>
> Cc: r-help mailing list <r-help at r-project.org>
> Subject: Re: [R] Converting a list to a data frame
>
> Or add the type column first and then rbind:
>
> 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)
> data.frame(type=z, dat[[z]])))
>
> ----------------------------------------
> David L Carlson
> Department of Anthropology
> Texas A&M University
> College Station, TX 77843-4352
>
> -----Original Message-----
> From: R-help <r-help-bounces at r-project.org> On Behalf Of William Dunlap via R-help
> Sent: Wednesday, May 2, 2018 12:28 PM
> To: Kevin E. Thorpe <kevin.thorpe at utoronto.ca>
> Cc: R Help Mailing List <r-help at r-project.org>
> Subject: Re: [R] Converting a list to a data frame
>
>> x1 <- do.call(rbind, c(x, list(make.row.names=FALSE)))
>> x2 <- cbind(type=rep(names(x), vapply(x, nrow, 0)), x1)
>> str(x2)
> 'data.frame': 4 obs. of 3 variables:
> $ type: Factor w/ 2 levels "A","B": 1 1 2 2
> $ x : int 1 2 5 6
> $ y : int 3 4 7 8
>
>
> Bill Dunlap
> TIBCO Software
> wdunlap tibco.com
>
> On Wed, May 2, 2018 at 10:11 AM, Kevin E. Thorpe <kevin.thorpe at 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.thorpe at utoronto.ca Tel: 416.864.5776 Fax: 416.864.3016
>>
>> ______________________________________________
>> R-help at 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/posti
>> ng-guide.html and provide commented, minimal, self-contained,
>> reproducible code.
>>
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at 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.
>
> ______________________________________________
> R-help at 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.
>
> ______________________________________________
> R-help at 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.
David Winsemius
Alameda, CA, USA
'Any technology distinguishable from magic is insufficiently advanced.' -Gehm's Corollary to Clarke's Third Law