[R] apply to multiple arrays simultaneously
Gabor Grothendieck
ggrothendieck at myway.com
Sat Jan 10 00:51:47 CET 2004
Try something like this:
mat.a1 <- apply( a1, 1:2, list )
mat.a2 <- apply( a2, 1:2, list )
mapply( my.function, a1, a2 )
Note that mat.a1 and mat.a2 are 3x4 matrices,
each element of which holds a matrix.
Date: Fri, 09 Jan 2004 10:10:03 +0000
From: Carlos Soares <csoares at liacc.up.pt>
To: <r-help at stat.math.ethz.ch>
Subject: [R] apply to multiple arrays simultaneously
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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