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

[Gabor Csardi]

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, Gonçalo 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