how to find subsets of a set in matlab? -


i have set of numbers 28 members. example:

a=1:28;

i want divided set 4 parts(each parts includes 7 numbers). how can find subsets? prefer save subsets in 4 matrixes calculate sum of each subset , other math operations.

on implementation, please have at: http://matlabtricks.com/post-9/get-all-subsets-having-a-given-length , author proposed 2 ways implementation.

-- naive way: enumeration subsets of set except empty set, can realized trick of binary decomposition ( see http://matlabtricks.com/post-7/select-all-subsets-of-a-set). counting size of each subsets , select ones fixed size.

-- non-trivial algorithm: requires initial subset fixed size. set, 1 can generate other similar subsets same size permutations.

tell me if have further questions.

cheers


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