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Rogerbrent (talk | contribs) m →Matrix-to-vector diag operator: add matrix form |
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The following property holds:
<math display="block">\operatorname{diag}(\mathbf{A}\mathbf{B}) = \sum_j \left(\mathbf{A} \circ \mathbf{B}^\textsf{T}\right)_{ij} = \left( \mathbf{A} \circ \mathbf{B} \right) \mathbf{1} </math>
== Scalar matrix ==
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