[R] indexing into a list 2

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From: Anna H. Pryor (anna@ptolemy.arc.nasa.gov)
Date: Thu 12 Jun 2003 - 23:39:54 EST


Message-id: <200306120639.54626.anna@ptolemy.arc.nasa.gov>

I didn't explain myself well.

You are right about not needing a list on the right hand side of the equation
below. What I end up with is a list of arrays. Now what i would like to do
is to access the individual elements in the arrays in the list. For example,
when I type, y[[1]], I just get the whole first array. How do I get the
first element in the first array for instance? Is that not possible?

Anna

Anna H. Pryor wrote:

> I am trying to make an array of lists. I don't think that I am doing it
right
> however because I cannot access the individual elements of the lists once I
> have created the array of lists. Can someone help?
>
>
> for(i in 1:3){
> y[[i]] = list(name[((i-1)*index+1):(i*index)])
> }
>
> Anna

Certainly you are not going to create an array of lists, but you are
going to create "just" a list. See the manuals for details.

If "name" is an atomic vector, you won't need a list, but to stay within
  your example:

  y[[i]] <- name[((i-1)*index+1):(i*index)]

to write the assignment's right hand side to the i-th element of list y.

Uwe Ligges

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