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symarray
2006 May 26
2
combinatorial programming problem
...ere is one programming problem I haven't solved, making an inverse
of the index function indx() --- se code below. It could for instance
return the original k indexes in strictly increasing order, to make
indx() formally invertible.
Any ideas?
Kjetil
Code:
# Implementing an S3 class for symarrays with array rank r for dimension
# [k, k, ..., k] with k>=r repeated r times. We do not store the diagonal.
# Storage requirement is given by {r, k}= choose(k, r)
# where r=array rank, k=maximum index
symarray <- function(data=NA, dims=c(1,1)){
r <- dims[1]
k <- dims[2]...