矩陣的乘法
Author: 陳彥鈞

a_{11} = 1 (slider from -5 to 5, step 1)
a_{12} = 2 (slider from -5 to 5, step 1)
a_{13} = 3 (slider from -5 to 5, step 1)
a_{21} = -2 (slider from -5 to 5, step 1)
a_{22} = -2 (slider from -5 to 5, step 1)
a_{23} = -3 (slider from -5 to 5, step 1)
a_{31} = 1 (slider from -5 to 5, step 1)
a_{32} = -3 (slider from -5 to 5, step 1)
a_{33} = -1 (slider from -5 to 5, step 1)
b_{11} = 2 (slider from -5 to 5, step 1)
b_{21} = 2 (slider from -5 to 5, step 1)
b_{31} = 1 (slider from -5 to 5, step 1)
text1: "\left [  \begin{array}{cc} " + (LaTeX[a_{11}]) + " & " + (LaTeX[a_{12}]) + " &" + (LaTeX[a_{13}]) + " \\ " + (LaTeX[a_{21}]) + " & " + (LaTeX[a_{22}]) + " &  " + (LaTeX[a_{23}]) + "\\ " + (LaTeX[a_{31}]) + " & " + (LaTeX[a_{32}]) + " & " + (LaTeX[a_{33}]) + " \\ \end{array}\right ] \left  [ \begin{array}{cc} " + (LaTeX[b_{11}]) + " \\  " + (LaTeX[b_{21}]) + "\\ " + (LaTeX[b_{31}]) + " \end{array}  \right ] =\left [  \begin{array}{} " + (LaTeX[a_{11} * b_{11} + a_{12} * b_{21} + a_{13} * b_{31}]) + " \\ " + (LaTeX[a_{21} * b_{11} + a_{22} * b_{21} + a_{23} * b_{31}]) + " \\" + (LaTeX[a_{31} * b_{11} + a_{32} * b_{21} + a_{33} * b_{31}]) + "  \end{array} \right ] "