[texhax] Matrix aligment

Andrei audreiev at prodigy.net.mx
Wed Mar 28 20:57:14 CEST 2007

Hi,
I would like to make a matrix like this
-1  1  1
1  1  1

But the problem I like is to align to the right, because the sign with
the number are always centered.
Im using:

\usepackage{amsmath}
\begin{gather}
\begin{matrix}
-1&1&1
1&1&1
\end{matrix}
\end{gather}

Thank you.