[R] how to delete the null elements in list

[Ben Bolker]

Tammy Ma <metal_licaling <at> live.com> writes:

> > suu
> [[1]]
> NULL
> [[2]]
> NULL
> [[3]]
> item_id  prod
>  1           2
> [[4]]
> item_id prod
> 1          2 
> 2          4
> 
> how to delete all "NULL" elements from suu to get only
> 
> >suu
> [[3]]
> item_id  prod
>  1           2
> [[4]] 
> item_id prod
> 1          2 
> 2          4


  How about suu[!sapply(suu,is.null)] ?  (Haven't tested, but I would
expect it to work ...

  Of course, the result won't have elements [[3]] and [[4]],
it will have elements [[1]] and [[2]] ...

 Ben Bolker