LaTeX.org

Hi, I am new to Latex and have really enjoyed using it so far, I have however come across my first annoyance. I am trying to use a table to display 3 matrices with a label under each. My code is:

\begin{tabularx}{\textwidth}{ X X X }
\centering
$\begin{matrix}
2 & 0 & 0 & 0 & 0 & 0 \\
0 & 2 ...