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**1327**on Tue Nov 05, 2013 7:11 pm

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## box around just one equation inside alignAdd tags
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## box around just one equation inside alignHi,
I am using "\begin{align}..." to align two equations. I would like to put a box around the second equation only. However, "\boxed{...}" does not seem to work if the alignment character "&" is inside the "{}". Any advice? Thanks a lot, Kai - kwicky
**Posts:**2**Joined:**Sun Mar 21st, 2010
## Re: box around just one equation inside alignAs you have seen you cannot directly, but we can cheat a little (in the example memoir is not important, it is jut my standard class in emacs)
- Code: Select all • Open in writeLaTeX
`\documentclass{memoir}` \usepackage{calc,amsmath} \newlength\dlf \newcommand\alignedbox[2]{ % #1 = before alignment % #2 = after alignment & \begingroup \settowidth\dlf{$\displaystyle #1$} \addtolength\dlf{\fboxsep+\fboxrule} \hspace{-\dlf} \boxed{#1 #2} \endgroup } \begin{document} \begin{align*} f(x) &= a \\ \alignedbox{g(x)}{=5} \end{align*} \end{document}
It is the same kind of trick \MoveEqLeft from mathtools make use of - daleif
**Posts:**199**Joined:**Wed Nov 19th, 2008
## Re: box around just one equation inside alignDaleif,
Brilliant, works perfectly! Thanks a lot, Kai - kwicky
**Posts:**2**Joined:**Sun Mar 21st, 2010
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