[R] how do i use the get function to obtain an element from alist...

[Leeds, Mark (IED)]

eval(parse(text=("a$x"). You can only use get when it's an object. a$x isn't. 


-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Juan Manuel Barreneche
Sent: Tuesday, August 21, 2007 3:35 PM
To: r-help at stat.math.ethz.ch
Subject: [R] how do i use the get function to obtain an element from alist...

my problem can be explained with the following example:

x <- 1:12
y <- 13:24
a <- data.frame(x = x, y = y)

## if i write
a$x
## it returns
[1]  1  2  3  4  5  6  7  8  9 10 11 12

## but the function get doesn't recognize a$x. Instead it produces the following error:
get("a$x")
Error in get(x, envir, mode, inherits) : variable "a$x" was not found

i intend to do it inside a loop, using a new object (and hence, a new
name) for each iteration (i.e., instead of a$x, it would be a$1, a$2, a$3, and so on, for a million times).

i would greatly appreciate it if someone could help me on this issue,

thanks in advance,

Juan Manuel Barreneche,
Zoología de Vertebrados,
Facultad de Ciencias,
UDELAR, Uruguay.

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