[Bioc-devel] Subsetting Lists by Lists

[Cook, Malcolm]

in the mean time, 

lapply(`[`,x,IntegerList(1:5))

??

 >-----Original Message-----
 >From: bioc-devel-bounces at r-project.org [mailto:bioc-devel-bounces at r-project.org] On Behalf Of Michael Lawrence
 >Sent: Tuesday, April 01, 2014 9:21 AM
 >To: bioc-devel at r-project.org
 >Subject: [Bioc-devel] Subsetting Lists by Lists
 >
 >Mostly to Herve:
 >
 >Sometimes we want to pluck the first 1, or 10, or whatever elements from
 >each element of a list. If I had a list 'x', I thought I could do this with:
 >
 >x[IntegerList(1:5)]
 >
 >But it only gives elements 1:5 from x[[1]], not each element of 'x'. In
 >other words, I thought the index would be repped out. Instead, 'x' is
 >subset to the length of 'i', and I'm not sure if that makes sense?
 >
 >But maybe what we really want are pluckHead/Tail, which would be robust to
 >the case that < n elements are in an element. And of course a more general
 >pluck(x, i) to select 'i' from each element, but I wanted the line above to
 >do that.
 >
 >Michael
 >
 >	[[alternative HTML version deleted]]
 >
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