R help - Oct 2011 - binding all elements of list (character vectors) to a matrix as rows

dear r-users,

i have got a problem which i am trying to solve:

i have got the following commands:

Mymatrix <- matrix(1:9,ncol=3)
Z <-
list("V1"=c("a","",""),"V2"=c("b","",""),"V3"=c("c","",""),"V4"=c("d","",""))
Mymatrix <- rbind(Mymatrix,Z[[1]],Z[[2]],Z[[3]],Z[[4]])

now this is working, but i would like to substitute

Z[[1]],Z[[2]],Z[[3]],Z[[4]]

for a command with which i could also use another list with a different
number of elements, e.g. 5 or 6 elements.

does anyone know the solution to this problem?
thank you very much in advance!

marion

	[[alternative HTML version deleted]]

Marion,

try

rbind( Mymatrix, do.call( "rbind", Z))

Hth  --  Gerrit


On Tue, 11 Oct 2011, Marion Wenty wrote:
> dear r-users,
>
> i have got a problem which i am trying to solve:
>
> i have got the following commands:
>
> Mymatrix <- matrix(1:9,ncol=3)
> Z <-
>
list("V1"=c("a","",""),"V2"=c("b","",""),"V3"=c("c","",""),"V4"=c("d","",""))
> Mymatrix <- rbind(Mymatrix,Z[[1]],Z[[2]],Z[[3]],Z[[4]])
>
> now this is working, but i would like to substitute
>
> Z[[1]],Z[[2]],Z[[3]],Z[[4]]
>
> for a command with which i could also use another list with a different
> number of elements, e.g. 5 or 6 elements.
>
> does anyone know the solution to this problem?
> thank you very much in advance!
>
> marion
>
> 	[[alternative HTML version deleted]]
>
> ______________________________________________
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> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

On Oct 11, 2011, at 2:47 AM, Marion Wenty wrote:
> dear r-users,
>
> i have got a problem which i am trying to solve:
>
> i have got the following commands:
>
> Mymatrix <- matrix(1:9,ncol=3)
> Z <-
> list
> ("V1
>
"=c("a","",""),"V2"=c("b","",""),"V3"=c("c","",""),"V4"=c("d","",""))
rbind(Mymatrix, t(as.data.frame(Z)))

The next method could be used if you had more lists:

do.call(rbind, list(Mymatrix, t(as.data.frame(Z))))

> Mymatrix <- rbind(Mymatrix,Z[[1]],Z[[2]],Z[[3]],Z[[4]])
>
> now this is working, but i would like to substitute
>
> Z[[1]],Z[[2]],Z[[3]],Z[[4]]
>
> for a command with which i could also use another list with a  
> different
> number of elements, e.g. 5 or 6 elements.
-- 

David Winsemius