[R] ask a question about list in R

[Phil Spector]

Song -
    Set the element to NULL:

> al=list(c(2,3),5,7)
> al[[2]] = NULL
> al
[[1]]
[1] 2 3

[[2]]
[1] 7

 					- Phil Spector
 					 Statistical Computing Facility
 					 Department of Statistics
 					 UC Berkeley
 					 spector at stat.berkeley.edu




On Thu, 24 Jun 2010, song song wrote:

> my list al is as below:
> al=list(c(2,3),5,7)
>> al
> [[1]]
> [1] 2 3
>
> [[2]]
> [1] 5
>
> [[3]]
> [1] 7
>
> and  I check the second component, its element is 5, then I remove this, now
> my al is:
>
> al[[2]][al[[2]]!=5]->al[[2]]
>> al
> [[1]]
> [1] 2 3
>
> [[2]]
> numeric(0)
>
> [[3]]
> [1] 7
>
> The Question is, how I can get the new list without the second component,
> that is :
>
>> alwanted
> [[1]]
> [1] 2 3
>
> [[2]]
> [1] 7
>
> Thank you for your help!!!
>
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