Summation to Matrix

Question

How would you represent the following in matrix notation?

$$ 1 - \sum_{i}\sum_{j} w_i w_j p_{ij} $$

Would the following be correct?

1-(W W' p)

Thanks

Hint: put $w_j$ at the right of $p_{i,j}$ – Raymond Manzoni May 06 '13 at 22:30 — Raymond Manzoni, May 06 '13 at 22:30

score 2 · Answer 1 · edited May 06 '13 at 22:50

2

I guess $w=(w_1,\ldots,w_n)^T$ is the vector and $P$ is the matrix. Then, it is rather $$1-(w^T P w)\,.$$ Expand it!

edited May 06 '13 at 22:50

Michael Hardy

answered May 06 '13 at 22:30

Berci

hi i forgot to mention that it is double summation. Sorry. Would that change the answer? – user1234440 May 06 '13 at 23:44

1 Answers1