[R] outer problem

Thomas Lumley thomas at biostat.washington.edu
Tue Jun 20 19:57:26 CEST 2000

On Tue, 20 Jun 2000, Erich Neuwirth wrote:

> thank you,
> i also looked into the definition of outer and now i understand what is
> happening.
> but now i have some more questions
> on how to vectoruce functions.
> lapply and sapply essentially allow to vectorise a fucntion with one
> argument.
> but is there a way of vectorizing a 2 argument function such that
> the 2 arguments lists are "run through" sybchronously?

Not at the moment.  We have talked about adding another apply function to
do this (eg papply) but haven't got around to it. The way it would work is

papply(X,Y,FUN), where X and Y are of length n, would basically do

sapply(1:n,function(i) FUN(X[i],y[i]))

but preferably implemented internally for speed.


Thomas Lumley
Assistant Professor, Biostatistics
University of Washington, Seattle

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