Re: [R] how to bind lists recursively

From: Charilaos Skiadas <cskiadas_at_gmail.com>
Date: Tue, 27 May 2008 22:55:13 -0400

On May 27, 2008, at 10:43 PM, Daniel Yang wrote:

> Dear all,
>
> I want to create a list that contains 0,1,2,3, ..., 10000 as its
> elements. I used the following code, which apparently doesn't work
> very well.
>
> a <- 0
> for(i in 1:10000) {
> a <- list(a, i)
> }
>
> The result is not what I wanted. So how to create the bind lists
> recursively so that the last element would be the newly added one
> while the previous elements all remain the same?

Hm, for the particular problem you are asking, I think that:

as.list(0:10000)

should do the trick. I m guessing it might not work for the real application you had in mind.

If you insist on the for loop, then you can do the following:

a <- list(0)
for(i in 1:10000) {

    a <- c(a, i)
}

Though it's much smaller. In general, it is better to assign the correct size to the list to begin with, I believe.

> Thanks!
> Daniel

Haris Skiadas
Department of Mathematics and Computer Science Hanover College



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