[R] more about outer
Peter Dalgaard BSA
p.dalgaard at biostat.ku.dk
Sun Sep 23 18:09:58 CEST 2001
Erich Neuwirth <erich.neuwirth at univie.ac.at> writes:
> this is my current answer to my own question.
> should we have such a funcion in a more general version
> (i.e. with an arbitraty number of argument lists, for n-ary
> in the core language?
> t(sapply(x,function(arg1) sapply(y,function(arg2) fun(arg1,arg2))))
I'd be partial to this kind of constructions
vectorize2 <- function(f)
sapply(seq, along=x, function(i)f(x[i],y[i],...))
so that you can simply do
outer(x, y, vectorize2(fun))
A similar technique for functions of one variable would be
vectorize <- function(f)
The case of N variables is -um- interesting...
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907
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