I have an equation in the following form: $\sum_j A\bf{x}_j$
Where, $A$ - is a matrix and
$\bf{x}_j$ is a vector.
Can I write this equation in the following form?
$A\sum_j \bf{x}_j$
2026-03-27 21:05:30.1774645530
Matrix vector multiplication inside summation
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Yes you can. Matrix multiplication is linear; that is, $A(x_1 + x_2) = Ax_1 + Ax_2$ and $A(cx) = cAx$ where $c$ is a constant. Your desired expression is just an extension of the first property.