Author: 李季樵

a1 = 1 (slider from -5 to 5, step 0.1)
a2 = 3 (slider from -5 to 5, step 0.1)
a3 = 2 (slider from -5 to 5, step 0.1)
b1 = 4 (slider from -5 to 5, step 0.1)
b2 = -2 (slider from -5 to 5, step 0.1)
b3 = -1 (slider from -5 to 5, step 0.1)
c1 = -5 (slider from -5 to 5, step 0.1)
c2 = -4 (slider from -5 to 5, step 0.1)
c3 = 1 (slider from -5 to 5, step 0.1)
d1 = 2 (slider from -5 to 5, step 0.1)
d2 = 4 (slider from -5 to 5, step 0.1)
d3 = -1 (slider from -5 to 5, step 0.1)
text1: "$ \left [\begin{array}{cc} " + (LaTeX[a1]) + " & " + (LaTeX[a2]) + " & " + (LaTeX[a3]) + "\\ " + (LaTeX[b1]) + " & " + (LaTeX[b2]) + "& " + (LaTeX[b3]) + "\\ " + (LaTeX[c1]) + " & " + (LaTeX[c2]) + " & " + (LaTeX[c3]) + " \\ \end{array}  \right ]  \left [ \begin{array}{cc} " + (LaTeX[d1]) + " \\ " + (LaTeX[d2]) + " \\ " + (LaTeX[d3]) + " \end{array}  \right ] =\left [  \begin{array}{cc} " + (LaTeX[a1 * d1 + a2 * d2 + a3 * d3]) + "\\ " + (LaTeX[b1 * d1 + b2 * d2 + b3 * d3]) + " \\ " + (LaTeX[c1 * d1 + c2 * d2 + c3 * d3]) + "\end{array} \right ] $"