General ⇒ Scale equation using \begin{align}

[marbocam]

Hi,
I have an equation that doesn't fit at the end of a page and, therefore, it jumps into the next page leaving a blank empty space...

I'm trying to reduce it's size, and I actually managed to do it by using \scalebox{0.9}{$ to wrap it, but then i loose the numbering of the equation.. What am I doing wrong?

Here is my code:

Code: Select all

\documentclass{article}
\usepackage{amsmath,array}
\begin{document}
\[
\scalebox{0.9}{$
\begin{align}
	{E}_{PD}\ \left(t \right) =& \!\left[ {T}_o{J}_o\left({{m}_{RF}} \right) + j{J}_1\left({{m}_{RF}} \right){e}^{j\frac{1}{2}{\beta }_2L\omega _{RF}^2} \right.\\ \nonumber
& \times \left({{e}^{j{\omega }_{RF}t} + {e}^{ - j{\omega }_{RF}t}} \right) \\ \nonumber
& \!-\! \left. {J}_2\left({{m}_{RF}} \right){e}^{j2{\beta }_2L\omega _{RF}^2}\!\left({{e}^{j2{\omega }_{RF}t} \!+\! {e}^{ - j2{\omega }_{RF}t}} \!\right) \!\right] e ^{j{\omega }_ot}\\ \nonumber
& + {T}_o{J}_o\left({{m}_{RF}} \right){e}^{j\frac{1}{2}{\beta }_2L\omega _{IF}^2}\left({m}_ + \cdot {e}^{j{\omega }_{IF}t} + {m}_ - \right.\\ \nonumber
& \cdot \left. {e}^{ - j{\omega }_{IF}t} \right){e}^{j{\omega }_ot} + j{J}_1\left({{m}_{RF}} \right){e}^{j\frac{1}{2}{\beta }_2L{{\left({{\omega }_{RF} + {\omega }_{IF}} \right)}}^2}\\ \nonumber
& \times \left({{m}_ + {e}^{j\left({{\omega }_{RF} + {\omega }_{IF}} \right)t} + {m}_ - {e}^{ - j\left({{\omega }_{RF} + {\omega }_{IF}} \right)t}} \right){e}^{j{\omega }_ot} \\ \nonumber
& + j{J}_1\left({{m}_{RF}} \right){e}^{j\frac{1}{2}{\beta }_2L{{\left({{\omega }_{RF} - {\omega }_{IF}} \right)}}^2}\\ \nonumber
&\!\times\! \left({{m}_ - \cdot {e}^{j\left({{\omega }_{RF} \!-\! {\omega }_{IF}} \right)t} \!+\! {m}_ + \cdot {e}^{ - j\left({{\omega }_{RF} \!-\! {\omega }_{IF}} \right)t}} \right){e}^{j{\omega }_ot} \\ \nonumber
& - {J}_2\left({{m}_{RF}} \right){e}^{j\frac{1}{2}{\beta }_2L{{\left({2{\omega }_{RF} + {\omega }_{IF}} \right)}}^2}\\ \nonumber
& \times \left({{m}_ + \cdot {e}^{j\left({2{\omega }_{RF} + {\omega }_{IF}} \right)t} + {m}_ - \cdot {e}^{ - j\left({2{\omega }_{RF} + {\omega }_{IF}} \right)t}} \right)\\ \nonumber
& \times {e}^{j{\omega }_ot} - {J}_2\left({{m}_{RF}} \right){e}^{j\frac{1}{2}{\beta }_2L{{\left({2{\omega }_{RF} - {\omega }_{IF}} \right)}}^2}\\ \nonumber
& \!\times\! \left({{m}_ - \cdot {e}^{j\!\left({2{\omega }_{RF} \!-\! {\omega }_{IF}} \!\right)t} \!+\! {m}_ + \cdot {e}^{ - j\!\left({2{\omega }_{RF} \!-\! {\omega }_{IF}} \!\right)t}} \!\right){e}^{j{\omega }_ot}\label{poc_E_PD_t}
\end{align}
$}
\]
\end{document}

Thanks in advance!

[Stefan Kottwitz]

"Displayed" equations cannot be nested. Like, we cannot put a page on a page, but we can put a smaller box on a page.

There are math environments that can be used within a displayed math environment, like aligned (instead of align). This works:

Code: Select all

\documentclass{article}
\usepackage{amsmath,array,graphicx}
\begin{document}
\begin{equation}
\scalebox{0.9}{$
\begin{aligned}
	{E}_{PD}\ \left(t \right) =& \!\left[ {T}_o{J}_o\left({{m}_{RF}} \right) + j{J}_1\left({{m}_{RF}} \right){e}^{j\frac{1}{2}{\beta }_2L\omega _{RF}^2} \right.\\
& \times \left({{e}^{j{\omega }_{RF}t} + {e}^{ - j{\omega }_{RF}t}} \right) \\
& \!-\! \left. {J}_2\left({{m}_{RF}} \right){e}^{j2{\beta }_2L\omega _{RF}^2}\!\left({{e}^{j2{\omega }_{RF}t} \!+\! {e}^{ - j2{\omega }_{RF}t}} \!\right) \!\right] e ^{j{\omega }_ot}\\
& + {T}_o{J}_o\left({{m}_{RF}} \right){e}^{j\frac{1}{2}{\beta }_2L\omega _{IF}^2}\left({m}_ + \cdot {e}^{j{\omega }_{IF}t} + {m}_ - \right.\\
& \cdot \left. {e}^{ - j{\omega }_{IF}t} \right){e}^{j{\omega }_ot} + j{J}_1\left({{m}_{RF}} \right){e}^{j\frac{1}{2}{\beta }_2L{{\left({{\omega }_{RF} + {\omega }_{IF}} \right)}}^2}\\
& \times \left({{m}_ + {e}^{j\left({{\omega }_{RF} + {\omega }_{IF}} \right)t} + {m}_ - {e}^{ - j\left({{\omega }_{RF} + {\omega }_{IF}} \right)t}} \right){e}^{j{\omega }_ot} \\
& + j{J}_1\left({{m}_{RF}} \right){e}^{j\frac{1}{2}{\beta }_2L{{\left({{\omega }_{RF} - {\omega }_{IF}} \right)}}^2}\\
&\!\times\! \left({{m}_ - \cdot {e}^{j\left({{\omega }_{RF} \!-\! {\omega }_{IF}} \right)t} \!+\! {m}_ + \cdot {e}^{ - j\left({{\omega }_{RF} \!-\! {\omega }_{IF}} \right)t}} \right){e}^{j{\omega }_ot} \\
& - {J}_2\left({{m}_{RF}} \right){e}^{j\frac{1}{2}{\beta }_2L{{\left({2{\omega }_{RF} + {\omega }_{IF}} \right)}}^2}\\
& \times \left({{m}_ + \cdot {e}^{j\left({2{\omega }_{RF} + {\omega }_{IF}} \right)t} + {m}_ - \cdot {e}^{ - j\left({2{\omega }_{RF} + {\omega }_{IF}} \right)t}} \right)\\
& \times {e}^{j{\omega }_ot} - {J}_2\left({{m}_{RF}} \right){e}^{j\frac{1}{2}{\beta }_2L{{\left({2{\omega }_{RF} - {\omega }_{IF}} \right)}}^2}\\
& \!\times\! \left({{m}_ - \cdot {e}^{j\!\left({2{\omega }_{RF} \!-\! {\omega }_{IF}} \!\right)t} \!+\! {m}_ + \cdot {e}^{ - j\!\left({2{\omega }_{RF} \!-\! {\omega }_{IF}} \!\right)t}} \!\right){e}^{j{\omega }_ot}\label{poc_E_PD_t}
\end{aligned}
$}
\end{equation}
\end{document}

Stefan

[marbocam]

Thank you, Stefan! It worked like a charm