matrix.md

\begin{equation*}
\left[ \begin{array}{cccc}
i_{1} & i_{2} & i_{3} \\\end{array} \right] \times \left[ \begin{array}{cccc}
W_{i1j1} & W_{i1j2} & W_{i1j3} \\
W_{i2j1} & W_{i2j2} & W_{i2j3} \\
W_{i3j1} & W_{i3j2} & W_{i3j3} \\ \end{array} \right] = \left[ \begin{array}{cccc}
h_{1in} & h_{2in} & h_{3in} \\\end{array} \right]
\end{equation*}

\begin{equation*}
\left[ \begin{array}{cccc}
0.1 & 0.2 & 0.7 \\ \end{array} \right] \times \left[ \begin{array}{cccc}
0.1 & 0.4 & 0.3 \\
0.3 & 0.7 & 0.7 \\
0.5 & 0.2 & 0.9 \\ \end{array} \right] =  \left[\begin{array}{cccc}
0.35 & 0.27 & 0.8 \\ \end{array} \right]
\end{equation*}