On Mar 30, 2010, at 5:23 PM, klc wrote:
Hi-
I am trying use the get function to return the value of an object
within a
list. As an abbreviated example:
"original" represents a list of several objects, one of which is "a.
1".
original<-vector('list',5)
names(original) <- c("a.1","a.2","a.3","b.1","b.2")
original$a.1 <- c(4,3)
When I enter:
original$a.1
R returns the following vector
[1] 4 3
however, when I enter:
get("original$a.1")
> get("original")$a.1
[1] 4 3
The get function will not parse and evaluate complex expressions for
you. And the "$" operator is probably not as useful for this
application as "[[" would be. See below
R returns the following error:
"Error in get("original$a.1") : object 'original$a.1' not found"
Does anyone happen to know how to resolve this error?
I pose this question because ultimately I would like to use the get
function
to convert particular objects within "original" into separate lists
as:
species <- c(1,2,3)
A <- vector('list',length(species))
A <- lapply(paste("original$a.", species, sep=""), get)
> sapply(names(original), function(x) original[[x]])
$a.1
[1] 4 3
$a.2
NULL
$a.3
NULL
$b.1
NULL
$b.2
NULL
> sapply(1:3, function(x) original[[x]])
[[1]]
[1] 4 3
[[2]]
NULL
[[3]]
NULL
I apologize if I missed this question in a previous post.
Many thanks-
--
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