[R] removing NULL elements from a list

Uwe Ligges ligges at statistik.uni-dortmund.de
Mon Apr 14 17:04:05 CEST 2003

Ramon Diaz wrote:
> Dear All,
> I have a list, where several components are NULL, and I'd like to obtain that 
> very same list without the NULL components (i.e., I do not want to unlist or 
> otherwise loose the rest of the list structure). I can do that with a loop, 
> but how could I do it without a loop?

For a list L:
   L[!sapply(L, is.null)]

Uwe Ligges

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