R help - Jul 2013 - Adding List Elements To A Data Frame

Hi 

I am trying to add the contents of the list "myList" to a new column
"z" in
the data frame "myDataframe"

myList <- list(c("A1","B1"),
c("A2","B2","C2"),
c("A3","B3"))

myDataframe <- data.frame(x=c(1,2,3),
y=c("R","S","T"))

Would like to produce

x  y  z
1  R  A1,B1
2  S  A2,B2,C2
3  T  A3,B3

where z is a character string holding the contents of the different elements
of the list.

Any thoughts greatly appreciated.

Pete 




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On 7/19/2013 12:54 PM, Pete Brecknock wrote:
> Hi
>
> I am trying to add the contents of the list "myList" to a new
column "z" in
> the data frame "myDataframe"
>
> myList <- list(c("A1","B1"),
c("A2","B2","C2"),
c("A3","B3"))
>
> myDataframe <- data.frame(x=c(1,2,3),
y=c("R","S","T"))
>
> Would like to produce
>
> x  y  z
> 1  R  A1,B1
> 2  S  A2,B2,C2
> 3  T  A3,B3
myDataframe$z <- sapply(myList, paste0, collapse=",")
> where z is a character string holding the contents of the different
elements
> of the list.
>
> Any thoughts greatly appreciated.
>
> Pete
-- 
Brian S. Diggs, PhD
Senior Research Associate, Department of Surgery
Oregon Health & Science University

On Jul 19, 2013, at 12:54 PM, Pete Brecknock wrote:
> Hi 
> 
> I am trying to add the contents of the list "myList" to a new
column "z" in
> the data frame "myDataframe"
> 
> myList <- list(c("A1","B1"),
c("A2","B2","C2"),
c("A3","B3"))
> 
> myDataframe <- data.frame(x=c(1,2,3),
y=c("R","S","T"))
> 
> Would like to produce
> 
> x  y  z
> 1  R  A1,B1
> 2  S  A2,B2,C2
> 3  T  A3,B3
> 
> where z is a character string holding the contents of the different
elements
> of the list.
> myDataframe[[3]] <- I(myList)
> myDataframe
  x y          z
1 1 R     A1, B1
2 2 S A2, B2, C2
3 3 T     A3, B3

-- 

David Winsemius
Alameda, CA, USA