for loop with global variables

Petr PIKAL <petr.pikal at precheza.cz> 
Odeslal: r-help-bounces at r-project.org

28.04.2011 17:17

Komu

ivan <i.petzev at gmail.com>

Kopie

r-help at r-project.org

P?edm?t

Re: [R] for loop with global variables

Hi

r-help-bounces at r-project.org napsal dne 28.04.2011 16:59:26:

ivan <i.petzev at gmail.com> 
Odeslal: r-help-bounces at r-project.org

28.04.2011 16:59

Komu

jim holtman <jholtman at gmail.com>

Kopie

r-help at r-project.org

P?edm?t

Re: [R] for loop with global variables

Hi,

thank you for the response. What I actually want to do is pick 

automatically

the results of the various outputs (which I have already defined as
variables, e.g. output.1,output.2,etc) and insert them into a table. 

list variable would be redundant since in order to create the data 

I

would rather type data.frame(results=rbind(output.1,output.2,etc.)). 

I

had 100 outputs, this would be much work. I rather meant something 

for(i in 1:100) {x=data.frame(results=rbind(output.[[i]]))}, which 

not

work though. It says that object "output." cannot be found.

Kind Regards

That is the problem. If you used list in the first time you could save 
yourself much problems. BTW - data frame is also a list with some 

formating.

To extend my example

for(i in 1:3) {
lll[[i]] <- sample(letters,3)
names(lll)[i] <- LETTERS[i]
}

lll
$A
[1] "x" "t" "h"
$B
[1] "c" "m" "w"
$C
[1] "n" "s" "e"

 as.data.frame(lll)
  A B C
1 x c n
2 t m s
3 h w e

Regards
Petr

On Thu, Apr 28, 2011 at 4:31 PM, jim holtman <jholtman at gmail.com> 

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.

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