[R] Subsetting list of vectors with list of (boolean) vectors?

[Liaw, Andy]

From: Marc Schwartz
> 
> On Thu, 2007-04-12 at 18:12 +0200, Johannes Graumann wrote:
> > Dear Rologists,
> > 
> > I'm stuck with this. How would you do this efficiently:
> > 
> > > aPGI
> > [[1]]
> > [1] "864"  "5576"
> > 
> > 
> > > aPGItest
> > [[1]]
> > [1]  TRUE FALSE
> > 
> > > result <- [magic box involving subset)
> > 
> > > result
> > [[1]]
> > [1] "864"
> > 
> > Thanks for any hints,
> > 
> > Joh
> 
> 
> > lapply(seq(along = length(aPGI)), function(x) 
> > aPGI[[x]][aPGItest[[x]]])
> [[1]]
> [1] "864"

Alternatively:

R> mapply("[", aPGI, aPGItest, SIMPLIFY=FALSE)
[[1]]
[1] "864"

Cheers,
Andy

 
> 
> I think that this should be a generic solution for multiple 
> (but common) levels in each list.
> 
> HTH,
> 
> Marc Schwartz
> 
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