R help - Apr 2011 - for loop with global variables

Hi,

is there a possibility to use global variables in a for loop. More
specifically, I want to do the following:

output.1<-rbind("a","b")
output.2<-rbind("c","d")
output.3<-rbind("e","f")
.
.
.
output.n<-rbind(...,...)

next I want to create a data frame with two columns:

Outputs
Values  output.1 "a","b"  output.2
"c","d"  output.3 "e","f"  .
 .
 output.n …,…
My problem is that I do not how to define a loop over global variables.
Anybody an idea?

Thanks.

	[[alternative HTML version deleted]]

Yes you can, but there is not enough explaination as to what you
really want to do.  I would suggest that you look at using a 'list'
instead of individual objects:

myList <- list(output.1 = rbind('a','b'), output.2 =
rbind('c','d'), ...)

Then you can use 'lapply' to operation on the elements.

On Thu, Apr 28, 2011 at 10:16 AM, ivan <i.petzev at gmail.com>
wrote:
> Hi,
>
> is there a possibility to use global variables in a for loop. More
> specifically, I want to do the following:
>
> output.1<-rbind("a","b")
> output.2<-rbind("c","d")
> output.3<-rbind("e","f")
> .
> .
> .
> output.n<-rbind(...,...)
>
> next I want to create a data frame with two columns:
>
> Outputs
> Values ?output.1 "a","b" ?output.2
"c","d" ?output.3 "e","f" ?.
> ?.
> ?output.n ?,?
> My problem is that I do not how to define a loop over global variables.
> Anybody an idea?
>
> Thanks.
>
> ? ? ? ?[[alternative HTML version deleted]]
>
>
> ______________________________________________
> 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.
>
>


-- 
Jim Holtman
Data Munger Guru

What is the problem that you are trying to solve?

Hi

r-help-bounces at r-project.org napsal dne 28.04.2011 16:16:16:
> ivan <i.petzev at gmail.com> 
> Odeslal: r-help-bounces at r-project.org
> 
> 28.04.2011 16:16
> 
> Komu
> 
> r-help at r-project.org
> 
> Kopie
> 
> P?edm?t
> 
> [R] for loop with global variables
> 
> Hi,
> 
> is there a possibility to use global variables in a for loop. More
> specifically, I want to do the following:
> 
> output.1<-rbind("a","b")
> output.2<-rbind("c","d")
> output.3<-rbind("e","f")
> .
> .
> .
> output.n<-rbind(...,...)
> 
> next I want to create a data frame with two columns:
> 
> Outputs
> Values  output.1 "a","b"  output.2
"c","d"  output.3 "e","f"  .
>  .
>  output.n ?,?
> My problem is that I do not how to define a loop over global variables.
> Anybody an idea?
Don't do that. As Jim suggested use list inside a loop.

#declare a list
lll<-vector("list",3)

#do your loop
for(i in 1:3) lll[[i]] <- letters[i]

lll
[[1]]
[1] "a"

[[2]]
[1] "b"

[[3]]
[1] "c"

But I feel that you could maybe achieve desired result without loop in 
more Rish way. If what you want to do is reasonable and frequent I believe 
somebody already made a function which does what you want.

Regards
Petr

> 
> Thanks.
> 
>    [[alternative HTML version deleted]]
> 
> ______________________________________________
> 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.