[R] is there a way to recursilvely lapply
armstrong.whit at gmail.com
Thu Dec 11 21:47:18 CET 2008
Thanks, Gabor and Prof. Ripley.
Sorry for the oversight.
I grepped the lapply help for recursive prior to sending my question.
why does it appear as "*r*ecursive" in the help file? or is that just
a formating problem on my machine?
On Thu, Dec 11, 2008 at 3:13 PM, Prof Brian Ripley
<ripley at stats.ox.ac.uk> wrote:
> On Thu, 11 Dec 2008, Whit Armstrong wrote:
>> for a simple example:
>> x <- list()
>> x[["a"]] <- list(a=c(1,2,3),b=c(3,4,5))
>> x[["b"]] <- list(a=c(6,7,8),b=c(9,10,11))
>> this fails w/
>> Error in FUN(X[[1L]], ...) : invalid 'type' (list) of argument
>> Just wondering if I have overlooked something obvious.
> rapply? Which is linked from ?lapply (I just checked). Perhaps
>> rapply(x, sum)
> a.a a.b b.a b.b
> 6 12 21 30
>> rapply(x, sum, how="list")
>  6
>> one can also do:
>> but that assumes that you already know how many levels you have, and
>> that all the levels are consistent.
>> R-help at r-project.org mailing list
>> PLEASE do read the posting guide
>> and provide commented, minimal, self-contained, reproducible code.
> Brian D. Ripley, ripley at stats.ox.ac.uk
> Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
> University of Oxford, Tel: +44 1865 272861 (self)
> 1 South Parks Road, +44 1865 272866 (PA)
> Oxford OX1 3TG, UK Fax: +44 1865 272595
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