[R] how to delete a matrix column

[Jeff Newmiller]

"a" looks pretty short to me, just two elements.

You should spend some (more) time reading the "Introduction to R" document that is supplied with the software... particularly the parts on indexing.
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Sent from my phone. Please excuse my brevity.

"李红旺" <hongwangli at sjtu.edu.cn> wrote:

>> a<-c(1,4)
>> a
>[1] 1 4
>> b<-a*5
>> b
>[1] 5 20
>
>a is a very long vector , how can i get c(1:5,4:20)? i do not want to
>use a loop.
>
>thanks very much!
>
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