> On Sat, Jun 6, 2009 at 1:59 PM, Alan G Isaac <ais...@american.edu
>     For sure GAUSS does.  The result of   x' * A * x
>     is a "matrix" (it has one row and one column) but
>     it functions like a scalar (and even more,
>     since right multiplication by it is also allowed).


On 6/6/2009 4:32 PM Charles R Harris apparently wrote:
> It's actually an inner product


Sorry for the confusion: I was just reporting how GAUSS
treats the expression x' * A * x.

Alan


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