The following LaTeX document is based on the the LaTeX Panel in TeXShop (
http://www.uoregon.edu/~koch/texshop/). The documentation for TeXShop attributes the LaTeX panel part of the program to Geoffroy Lenglin (geoffroy.lenglin@m4x.org). I found the reference useful and I decided that it should be an online document. I typeset a few table using the begin{matrix} end{matrix} construction. The document is available in the LaTeX form and pdf.