generated list element names

If you have a list and want to add a new (or replace a)
named component use
  myList[[compName]] <- compValue
as in
  myList <- list()
  compName <- "Incr"
  compValue <- function(x) x + 1
  myList[[compName]] <- compValue

If you want to make a new list-with-names from scratch try
  structure(list(1, "cat", function(x)x+1),  
names=c("One","Pet","Increment"))
(structure() is a general way to make an object and add attributes to
it in one statement.)

Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org 
] On Behalf
Of Sam Steingold
Sent: Monday, November 19, 2012 10:07 AM
To: r-help at r-project.org
Subject: [R] generated list element names

How can I create lists with element names created on the fly?

--8<---------------cut here---------------start------------->8---

list (foo = 10)

$foo
[1] 10

list ("foo" = 10)

$foo
[1] 10

list (paste("f","oo",sep="") = 10)

Error: unexpected '=' in "list (paste("f","oo",sep="") ="
--8<---------------cut here---------------end--------------->8---

I understand that tags in list() are not evaluated, but is there a  
more
elegant way than

--8<---------------cut here---------------start------------->8---

z <- list(10)
names(z) <- paste("f","oo",sep="")
z

$foo
[1] 10
--8<---------------cut here---------------end--------------->8---

thanks!

--
Sam Steingold (http://sds.podval.org/) on Ubuntu 12.04 (precise) X  
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