All combinations of dimensions

["Alain Yamakana" <alain.yamakana@rogers.com>]

Dear All,

I would be very appreciative of your help with the following. Given a 3-D
matrix M I would like to perform all submatrices
M[-c(i,i+1),-c(j,j+1),-c(k,k+1)] for i in 1:nrow(M), j in 1:ncol(M), and k
in 1:dim(M)[3] AND keep track of all combinations (1,1,1), (1,1,2), (1,1,3),
etc. I tried expand.grid() function without success on a 2-D matrix.

Regards, AY