Latex tips and tricks

=====Boxed equation=====

Define a new command as follows:

<code latex>

\newcommand{\boxedeqn}[1]{%

  \[\fbox{%

      \addtolength{\linewidth}{-2\fboxsep}%

      \addtolength{\linewidth}{-2\fboxrule}%

      \begin{minipage}{\linewidth}%

      \begin{equation}#1\end{equation}%

      \end{minipage}%

    }\]%

}

</code>

Here is an example of its use:

<code latex>

\boxedeqn{

  X_1(j\omega) =

    \int\limits^{+\infty}_{-\infty} x_1(t) e^{-j\omega t} dt

}

</code>

If you dont want to box the equation number, use \boxed{…}