[R] Array help

[Joshua Wiley]

Hi B,

What you need to do is pass a vector with the indices you want to
extract.  So, you have 1:7 (which expands to 1, 2, 3, ... 7) and 12:34
(which again expands).  How would you combine two sets of numbers?
c(), the combine or concatenate function.  Putting this in action:

mya <- array(1:510, dim = c(34, 5, 3))

mya[c(1:7, 12:34), , ]

Do note that the row numbers will update unless they were explicitly
named.  So they will be numbered 1:30, not 1:7 and 12:34.

Cheers,

Josh


On Sun, Nov 28, 2010 at 6:36 PM, bfhancock <brianfhancock at gmail.com> wrote:
>
> Hi! I am learning R and have a question that is probably fairly simple for
> those of you much more learned than I.
>
> I am messing with Arrays and am doing some simple stuff to get the hang of
> them.  I will have a seperate array already pulled up and it will have
> columns and rows.  I figured out that I can seperate these out with commands
> like "array_name"[,1,1].  Now, I have an array where I want to make a single
> array from a two ranges in the original array.  from 1:7 and 12:34.  I know
> if i just did it with 1:7 it is just "array_name"[1:7,,] and that is it.
> But i wanted 12:34 in there as well. I assumed at first that it would just
> be "array_name"[1:7 & 12:34,,] but was wrong.  Can anyone help me with this?
> Thanks so much!
>
> -B
> --
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-- 
Joshua Wiley
Ph.D. Student, Health Psychology
University of California, Los Angeles
http://www.joshuawiley.com/