[R] bind select data frames

[Joshua Wiley]

On Wed, Jun 2, 2010 at 8:06 AM, arnaud Gaboury <arnaud.gaboury at gmail.com> wrote:
> I am working with something like this :
>
>  for (i in sel[-1])  {
> dd<-data.frame(do.call(rbind, mget(paste("DailyPL",i,sep=""),envir=.GlobalEnv)),row.names=NULL)
>
>               }
>
> But the result is not good. In the case where sel[-1]<-c("100420", "100421"), "dd" is only equal to "DailyPL100421"

Yes, because it is in a loop, dd is reassigned for each value of i.
That is why in the first loop I sent you I included the old data in
the rbind, otherwise it is just overwritten everytime it loops.

Josh

>
>
>
>
>> -----Original Message-----
>> From: Joshua Wiley [mailto:jwiley.psych at gmail.com]
>> Sent: Wednesday, June 02, 2010 4:48 PM
>> To: arnaud Gaboury
>> Cc: r-help at r-project.org
>> Subject: Re: [R] bind select data frames
>>
>> Hello,
>>
>> Does this do what you are looking for?
>>
>> ############
>> output <- NULL
>> for(i in paste("DailyPL", sel, sep="")[-1]){
>>   output <- rbind(output, get(i))
>>   }
>> ############
>>
>> If you just want to rbind all the data frames, there are ways of doing
>> it without a loop too, but since you specifically asked with the
>> condition for(i in sep[-1]) I did it using a loop.
>>
>> Best regards,
>>
>> Josh
>>
>>
>> On Wed, Jun 2, 2010 at 7:24 AM, arnaud Gaboury
>> <arnaud.gaboury at gmail.com> wrote:
>> > Dear group,
>> >
>> > Here is my environment:
>> >
>> >> ls()
>> >  [1] "DailyPL100419" "DailyPL100420" "DailyPL100421" "dd"
>>  "i"
>> > "l"             "PLglobal"      "Pos100416"     "Pos100419"
>> "Pos100420"
>> > "Pos100421"     "position"
>> > [13] "result"        "sel"           "Trad100416"    "Trad100419"
>> > "Trad100420"    "Trad100421"    "trade"
>> >
>> > With "sel" the following element :
>> >
>> > sel <-
>> > c("100419", "100420", "100421")
>> >
>> >
>> > "DailyPL100419" , "DailyPL100420","DailyPL100421" are all data frames
>> with
>> > same columns names. I want to rbind them with this condition :
>> >
>> >
>> > for (i in sel[-1])
>> >
>> > I have no idea how to write it.
>> >
>> > TY for any help
>> >
>> > ______________________________________________
>> > R-help at 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
>> Senior in Psychology
>> University of California, Riverside
>> http://www.joshuawiley.com/
>
>



-- 
Joshua Wiley
Senior in Psychology
University of California, Riverside
http://www.joshuawiley.com/