Putting matrix row in a rectangle
Hello there.
I have a matrix like this (amsmath pkg):
$$
\begin{bmatrix}
a_{11} & a_{12} & \cdots & a_{1n} \\
\vdots & \vdots & \ddots & \vdots \\
a_{i1} & a_{i2} & \cdots & a_{in} \\
\vdots & \vdots & \ddots & \vdots \\
a_{n1} & a_{n2} & \cdots & a_{nn}
\end{bmatrix}
$$
How can I draw a rounded rectangle (or even simple rectangle) around
i-th row and another rectangle around second column? I've tried to put
\hline's around the row, but they are too long and cross braces.
With best regards, Ivan.
.
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