LaTeX.org

Hello,

I am getting invalid graphics extension when trying to use \centerline{\includegraphics[height=2.8in]{2D3D.eps}}

I have this at the front of the document:

\documentclass[12pt, doublespace]{article}
\usepackage{graphicx}

What am I doing wrong. I thought .eps was a valid graphics extension ...

Thanks for the response. I'll look at using the bmatrix structure that you gave me the example for. I have plenty of matrices to write. And good to know eqnarray is obsolete. Some background, I'm making changes to a 9 year old Latex document.

I'm new to Latex and all it's glory.
What am I doing wrong here?

\begin{eqnarray}
\left[ \begin{array}{c}
C_{\alpha}^{+} (x_o +\ell) \\
. \\
. \\
_____ \\
C_{\alpha}^{-} (x_o) \\
. \\
. \\
\end{array} \right]