[R] A one-liner to create a 3-dim array
Rolf Turner
rolf at math.unb.ca
Mon Jul 25 20:24:01 CEST 2005
B <- array(apply(A,1,function(x){x%o%x}),dim=c(nrow(A),dim(A)))
cheers,
Rolf Turner
rolf at math.unb.ca
Ravi Varadhan wrote:
> I would like to write a one-line R code to create a 3-dim array, B, of
> dimension (n,n,m) from a matrix, A, of dimension (m,n) such that the i-th
> element of the 3-dim array, B[, , i] is the outer product of the i-th row
> of A.
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