On Fri, 8 Aug 2008, Vadim Organovich wrote:
Dear R-users,
I am looking for a way to assign to slices of arrays where dimensionality of
the array is not a-priory known.
Specifically, I would like to be able to generalize the following example of
dimensionality 2 to an arbitrary diminsionality:
In this example we create an array x, a smaller array y and then assign y to a
slice of x.
dimnmx <- list(c('a','b'), c('x','y','z')); x <- array(0, dim=sapply(dimnmx,
length), dimnames=dimnmx)
x
x y z
a 0 0 0
b 0 0 0
dimnmy <- list(c('a','b'), c('x','z')); y <- array(1, dim=sapply(dimnmy,
length), dimnames=dimnmy)
y
x z
a 1 1
b 1 1
x[dimnames(y)[[1]], dimnames(y)[[2]]] <- y
x
x y z
a 1 0 1
b 1 0 1
Now suppose I have an arbitrary lists dimnmx and dimnmy which are dimnames of
respective arrays y and x. How do I assign y to the slice of x sliced out by
dimnmy:
dimnmx <- list(c('a','b'), c('x','y','z'), c('1','2')); x <- array(0,
dim=sapply(dimnmx, length), dimnames=dimnmx)
dimnmy <- list(c('a','b'), c('x','z'), c('2')); y <- array(1,
dim=sapply(dimnmy, length), dimnames=dimnmy)
something to the effect of do.call('[', list(x, dimnames(y))) <- y
I think this is the idiom you want:
do.call( `[<-` , c( list(x), dimnames(y), list( y ) ) )
and if you want to save this to `x`
x <- do.call(`[<-`, c(list(x), dimnames(y), list( y ) ) )
HTH,
Chuck
Thanks,
Vadim
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Charles C. Berry (858) 534-2098
Dept of Family/Preventive Medicine
E mailto:[EMAIL PROTECTED] UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/ La Jolla, San Diego 92093-0901
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