LaTeX.org

hi there,

How do I get a matrix nicer than the one with the commands below?

\begin{center}
$Q_3$=\begin{pmatrix}-3&3&0&0\\1&-3&2&0\\0&2&-3&1\\0&0&0&0\end{pmatrix}
\end{center}

This will give me the correct matrix but the "-"signs make it look ugly for bigger matrices....
Does anyone know how to ...

Hi

Thank you very very very much!!!

Hi there,

I'm writing a report in/with Latex and I need to draw some colored lines like:

---------------xxxxxxxxxxxx

xxxxxxxxxxxxxxx------------


where ------ is a red line and xxxxx blue

And it would be perfect if it can be thick lines also...

Does anyone have an idea how to create this in ...