That won't work if any vector has fewer than 5 elements. Maybe
lapply(x, head, n=5) would work? On Tue Apr 1 09:24:51 2014, Cook, Malcolm wrote:
in the mean time, lapply(`[`,x,IntegerList(1:5)) ?? >-----Original Message----- >From: bioc-devel-boun...@r-project.org [mailto:bioc-devel-boun...@r-project.org] On Behalf Of Michael Lawrence >Sent: Tuesday, April 01, 2014 9:21 AM >To: bioc-devel@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]] > >_______________________________________________ >Bioc-devel@r-project.org mailing list >https://stat.ethz.ch/mailman/listinfo/bioc-devel _______________________________________________ Bioc-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/bioc-devel
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