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combinat[subsets] - iterate over the power set of a set or list
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Calling Sequence
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subsets(L)
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Parameters
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L
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set or list of elements
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Description
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The function subsets is an iterator for generating the power set of a set one set at a time. It returns a table with two entries: finished and  .
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The finished entry will be either true or false, depending on whether the end of the set has been reached. It is initially set to false.
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The nextvalue entry is a procedure that traverses the power set. The result of a call to  will be the next set in the power set. When the entire set has been traversed, nextvalue will set the value of finished to true.
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If the input L is a set, the subsets are returned as sets. If the input is a list, the subsets are returned as lists. Otherwise the only difference is in the order in which the subsets are generated.
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The command with(combinat,subsets) allows the use of the abbreviated form of this command.
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