1.

Let the superscript T represent the transpose operation. Consider the function \(f(x) = \frac{1}{2} x^T Qx-r^Tx\), where x and r are n × 1 vectors and Q is a symmetric n × n matrix. the stationery point of f(x) is

A. r
B. Q-1 r
C. \(\frac{r}{r^Tr}\)
D. QTr
Answer» C. \(\frac{r}{r^Tr}\)


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