[R] Re: [S] tapply for matrices

[Peter Dalgaard BSA]

Frank E Harrell Jr <fharrell at virginia.edu> writes:

> Tony Plate provided what seems to be a very fast and elegant solution - see below.  I have modified his solution slightly:
> 
> mapply <- function(X, INDEX, FUN=NULL, ..., simplify=TRUE) {
> ## Matrix tapply

Before this propagates too far: The name "mapply" has also been
suggested for a "multiple apply", which is like lapply/sapply but
takes multiple X arguments and a FUN of several arguments. So
perhaps matrix.apply() or so would be better?

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
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