fullfact
              Full factorial design.
If N is a scalar, return the full factorial design with N binary choices, 0 and 1.
If N is a vector, return the full factorial design with ordinal choices 1 through n_i for each factor i.
Values in N must be positive integers.
@seealso {ff2n
Source Code: fullfact
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 ## Full factorial design with 3 binary variables
 fullfact (3)
ans =
   0   0   0
   0   0   1
   0   1   0
   0   1   1
   1   0   0
   1   0   1
   1   1   0
   1   1   1
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 ## Full factorial design with 3 ordinal variables
 fullfact ([2, 3, 4])
ans =
   1   1   1
   1   1   2
   1   1   3
   1   1   4
   1   2   1
   1   2   2
   1   2   3
   1   2   4
   1   3   1
   1   3   2
   1   3   3
   1   3   4
   2   1   1
   2   1   2
   2   1   3
   2   1   4
   2   2   1
   2   2   2
   2   2   3
   2   2   4
   2   3   1
   2   3   2
   2   3   3
   2   3   4
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