--- In Boost-Users@y..., John Lloyd
Hickman, Greg wrote:
Why isn't there an overloaded
matrix_expression operator* (const matrix_expression&, const matrix_expression&);
for peforming matrix multiplication?
Greg Hickman
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I think it has something to do with the fact that expression templates can be very inefficient for certain chained operations, e.g., A * B * v, where A and B are matrices and v is a vector.
Suppose you have a matrix expression like A = B * C * D. Using expression templates, this could result in an order n^5 time complexity as opposed to order n^3 complexity.
Exactly. I believe the theoretically more important signature is
prod