RE: [R] apply to multiple arrays simultaneously
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 +
From: Carlos Soares <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
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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Re: [R] apply to multiple arrays simultaneously
abind only allows one of the dimensions to be different. In may case
they differ on several dimensions. For instance, in the example I gave
(which was probably not clear enough), I would like
my.function to be called 3*4 times, each time being passed 2 matrices x
and y with dim(x)=c(5,6) and dim(y)=c(7,8).
Anyway, thanks for the tip, Andy.
Carlos
Liaw, Andy wrote:
Off the top of my head, seems like you can abind() the two together and then
run apply. See the abind package on CRAN.
HTH,
Andy
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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RE: [R] apply to multiple arrays simultaneously
Off the top of my head, seems like you can abind() the two together and then
run apply. See the abind package on CRAN.
HTH,
Andy
> 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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