[R] i think i asked the wrong ?

[John Fox]

Dear Jimi,

At 08:26 AM 2/18/2002 -0500, you wrote:
>me again, new to R, haven't programmed in a long time at all
>sorry to ask what is probably basic
>
>a while ago i asked how to remove an element from a list
>apparently what i am using is not a list but a vector, didn't realize 
>there was a list data type
>could also use a matrix for what i am doing, is there a way to remove 
>single elements from either of those?
>
>thanks for any help, if i was actually using a list as i said last time, 
>the answers i received would have cleared things right up

You can use negative indices to remove entries from a vector; for example,

 > v <- 1:10
 > v[-5]
[1]  1  2  3  4  6  7  8  9 10
 > v[-c(3,6)]
[1]  1  2  4  5  7  8  9 10

Removing single elements from a matrix doesn't make sense -- what goes in 
the hole? You can, however, remove entire rows or columns with negative 
indices.

(Indexing is discussed in all of the basic introductions to R and S of 
which I'm aware. It probably makes sense to read one of these -- you'll 
save time in the long run.)

I hope that this helps,
  John

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