[R] how do i use the get function to obtain an element from a list...
murdoch at stats.uwo.ca
Tue Aug 21 21:44:49 CEST 2007
On 8/21/2007 3:35 PM, Juan Manuel Barreneche wrote:
> 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
> ## it returns
>  1 2 3 4 5 6 7 8 9 10 11 12
> ## but the function get doesn't recognize a$x. Instead it produces the
> following error:
> Error in get(x, envir, mode, inherits) : variable "a$x" was not found
a$x is an expression, which you could evaluate, not a variable, which
you could get.
> i intend to do it inside a loop, using a new object (and hence, a new
> name) for each iteration (i.e., instead of a$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,
Why name things? I'd use something like
for (i in 1:1000000) print(a[[i]])
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