[R] apply to multiple arrays simultaneously

Liaw, Andy andy_liaw at merck.com
Fri Jan 9 14:39:43 CET 2004

Off the top of my head, seems like you can abind() the two together and then
run apply.  See the abind package on CRAN.


> From: Carlos Soares
> Dear R users,
> Suppose two arrays which partly have the same dimensions. For 
> instance, 
> a1 and a2 with dim(a1) is c(3,4,5,6) and dim(a2) is 
> c(3,4,7,8). How can 
> I perform an apply on the equivalent part of the dimensions on both 
> arrays simultaneously? Something like:
>   apply(list(a1, a2), c(1,2), function(x,y) {my.function(x,y)})
> A useful bonus would be, assuming that my.function always returns an 
> array withthe same dimensions (e.g., c(2,3,4), that the final result 
> would be an array wit
> h dimensions c(3,4,2,3,4).
> With best regards,
> Carlos

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