Re: [R] Generate object names from variables

[Gabor Grothendieck]

Try this:

sapply(vectors, get, simplify = FALSE)

or

lapply(vectors, get)

although the last one does not give you the names.

On 7/14/06, Georg Otto [EMAIL PROTECTED] wrote:
 Hi,

 I want to generate object names out of variables in a sort of variable
 substitution.

 first i generate some vectors and an empty list:

  vector.a-c(a,b)
  vector.b-c(c,d)
  vector.c-c(e,f)
  vectors-c(vector.a, vector.b, vector.c)
  vectors
 [1] vector.a vector.b vector.c

  vectorlist-list()

 What I would then like to do is to generate elements of the list by
 using variables, somehow like this (does not work):

 for (i in vectors) {
 + list$i-i
 + }

 To end up with a list like this:

  list
 $vector.a
  [1] a b
 $vector.b
  [1] c d
 $vector.c
  [1] e f


 Any hint will be appreciated.

 Cheers,

 Georg

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Re: [R] Generate object names from variables

[Marc Schwartz (via MN)]

On Fri, 2006-07-14 at 16:57 +0200, Georg Otto wrote:
 Hi,
 
 I want to generate object names out of variables in a sort of variable
 substitution.
 
 first i generate some vectors and an empty list:
 
  vector.a-c(a,b)
  vector.b-c(c,d)
  vector.c-c(e,f)
  vectors-c(vector.a, vector.b, vector.c)
  vectors
 [1] vector.a vector.b vector.c
 
  vectorlist-list()
 
 What I would then like to do is to generate elements of the list by
 using variables, somehow like this (does not work):
 
 for (i in vectors) {
 + list$i-i
 + }
 
 To end up with a list like this:
 
  list
 $vector.a
  [1] a b
 $vector.b
  [1] c d
 $vector.c
  [1] e f
 
 
 Any hint will be appreciated.
 
 Cheers,
 
 Georg

Presuming that your vectors fit a naming pattern of vector.x:

# Use grep() to get the vector names from ls()
 vectors - grep(vector[\.], ls(), value = TRUE)

 vectors
[1] vector.a vector.b vector.c

# Use sapply to create the list
 sapply(vectors, get, simplify = FALSE)
$vector.a
[1] a b

$vector.b
[1] c d

$vector.c
[1] e f


HTH,

Marc Schwartz

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Re: [R] Generate object names from variables

[Paul Johnson]

I collected some advice about this question a couple of  years ago.
This might help.

http://pj.freefaculty.org/R/Rtips.html#2.1 Add variables to a data
frame (or list)
and the next one after that.


On 7/14/06, Marc Schwartz (via MN) [EMAIL PROTECTED] wrote:
 On Fri, 2006-07-14 at 16:57 +0200, Georg Otto wrote:
  Hi,
 
  I want to generate object names out of variables in a sort of variable
  substitution.
 
  first i generate some vectors and an empty list:
 
   vector.a-c(a,b)
   vector.b-c(c,d)
   vector.c-c(e,f)
   vectors-c(vector.a, vector.b, vector.c)
   vectors
  [1] vector.a vector.b vector.c
 
   vectorlist-list()
 
  What I would then like to do is to generate elements of the list by
  using variables, somehow like this (does not work):
 
  for (i in vectors) {
  + list$i-i
  + }
 
  To end up with a list like this:
 
   list
  $vector.a
   [1] a b
  $vector.b
   [1] c d
  $vector.c
   [1] e f
 
 
  Any hint will be appreciated.
 
  Cheers,
 
  Georg


-- 
Paul E. Johnson
Professor, Political Science
1541 Lilac Lane, Room 504
University of Kansas

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