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\end{eqnarray}  \paragraph{Example 4.}  Let $A \in \complex^{m x \times  n}$ Given $x = [x_1, \ldots, x_n]^T \in \complex^n$ with $x_i = a_i + jb_i \in \complex$, $a_i,b_i \in \reals$, and $A \in \reals^{mxn}$What is $DAx$? \\ \\  \textbf{Solution:} \\  We have