Hi, I have a question about doing derivative with respect to a vector, can someone help please.
Problem:
Suppose A is a (nxn) dimensional symmetric matrix, \vec{x} is a (nx1) column vector.
We know that
\frac{d A\vec{x}}{d \vec{x}}=A
and
\frac{d \vec{x}^TA\vec{x}}{d...