[R] Decomposing a List

[arun]

Hi,
May be this helps.

L<- list(c("A1","B1"),c("A2","B2"),c("A3","B3"))
simplify2array(L)[1,]
#[1] "A1" "A2" "A3"
simplify2array(L)[2,]
#[1] "B1" "B2" "B3"


#or
library(stringr)
 word(sapply(L,paste,collapse=" "),1)
#[1] "A1" "A2" "A3"
A.K.



----- Original Message -----
From: "Ted.Harding at wlandres.net" <Ted.Harding at wlandres.net>
To: r-help at r-project.org
Cc: 
Sent: Thursday, April 25, 2013 6:16 AM
Subject: [R] Decomposing a List

Greetings!
For some reason I am not managing to work out how to do this
(in principle) simple task!

As a result of applying strsplit() to a vector of character strings,
I have a long list L (N elements), where each element is a vector
of two character strings, like:

  L[1] = c("A1","B1")
  L[2] = c("A2","B2")
  L[3] = c("A3","B3")
  [etc.]

>From L, I wish to obtain (as directly as possible, e.g. avoiding
a loop) two vectors each of length N where one contains the strings
that are first in the pair, and the other contains the strings
which are second, i.e. from L (as above) I would want to extract:

  V1 = c("A1","A2","A3",...)
  V2 = c("B1","B2","B3",...)

Suggestions?

With thanks,
Ted.

-------------------------------------------------
E-Mail: (Ted Harding) <Ted.Harding at wlandres.net>
Date: 25-Apr-2013  Time: 11:16:46
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