Recent content by songCalculus

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...