Hi,

apply(aperm(a), 2, sd)

-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

On 24/08/07, Florent Bresson <f_bresson@yahoo.fr> wrote:
>
> Dear R-users,
>
> I would like to apply a function (more precisely sd()) over the third
> dimension of a three-dimension array. The function apply would be
> interesting but the chosen function can only be applied on the rows and
> columns of the array according to the help file. I can use a loop to cut the
> array in matrices and then use apply for each replication, but it's not very
> nice. A small example:
>
> a    <-    array(runif(1200),c(3,4,100))
> b    <-    matrix(NA,3,4)
> for(j in 1:3){ b[j,]    <-    apply(a[j,,],1,sd) }
>
> Is there someting better than the use of a loop ?
>
> Thanks
>
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