R help - Jun 2003 - indexing into a list 2

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

Anna H. Pryor wrote:
> 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?
Just "append" that index. E.g., if your array in y[[1]] is 3D,
  y[[1]][1,1,1]
or maybe you mean
  y[[1]][ , , 1]

Uwe Ligges



> 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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