Re: [R] joining matrices, vectors, scalars in one object

From: Gabor Csardi <csardi_at_rmki.kfki.hu>
Date: Thu, 13 Mar 2008 14:26:59 +0100

You want to do

thing <- list() # empty thing
for ( i in 1:100 ) {
  thing[[i]] <- ?????
}

But where is ????? coming from? If you can index it with an integer then it is exactly coming from the kind of object you want to create. Chicken-egg problem. No?

G.

On Thu, Mar 13, 2008 at 09:04:11AM -0400, Gonšalo Ferraz wrote:
> Hi,
>
> I have:
>
> a <- matrix(c(0,1,0,1),nrow=2)
> b <- matrix(c(1,1,1,0,0,0),nrow=3)
> c <- 1
> d <- c(1,0,1)
>
> And I would like to join them in an object 'thing' so that I can
> access a, b, c, or d through an index in a for loop.
>
> For example:
> thing[4]
> would return
> [1] 1 0 1
>
> Note however, that I have many of these 'thing' components. So many
> that a command like
>
> thing <- list(a = matrix(c(0,1,0,1),nrow=2), b = matrix(c
> (1,1,1,0,0,0),nrow=3), c = 1, d = c(1,0,1))
>
> would become long and awkward.
>
> Is there a way of declaring an empty 'thing' of a given length and
> then assigning its elements from a for loop? I need to allow elements
> a, b, c... that can be scalars, vectors or matrices with varying
> dimensions.
>
> Thanks!
>
> Gon?alo
>
>
> [[alternative HTML version deleted]]
>

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-- 
Csardi Gabor <csardi_at_rmki.kfki.hu>    UNIL DGM

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Received on Thu 13 Mar 2008 - 13:44:29 GMT

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