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Re: Sum of Products


SymmetricPolynomial, for example,

SymmetricPolynomial[2, {a, b, c}] ==
  Total[Times @@@ Subsets[{a, b, c}, {2}]] // Simplify

True


SymmetricPolynomial[2, {a, b, c, d}] ==
  Total[Times @@@ Subsets[{a, b, c, d}, {2}]] // Simplify

True


SymmetricPolynomial[4, {a, b, c, d, e, f}] ==
  Total[Times @@@ Subsets[{a, b, c, d, e, f}, {4}]] // Simplify

True


Bob Hanlon


On Tue, May 29, 2012 at 5:48 AM, Harvey P. Dale <hpd1 at nyu.edu> wrote:
>        If I have a list and want to sum the products of each possible
> grouping of two elements in the list, this program will do that:
>
>                Total[Times @@@ Subsets[{a, b, c}, {2}]]
>
> Is there any other, shorter, built-in Mathematica object that will
> produce the same result?
>
>        Thanks.
>
>        Harvey



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