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box around just one equation inside align

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box around just one equation inside align

Hi,
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 "{}".

Thanks a lot,
Kai
kwicky

Posts: 2
Joined: Sun Mar 21st, 2010

Re: box around just one equation inside align

As 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: 198
Joined: Wed Nov 19th, 2008

Re: box around just one equation inside align

Daleif,

Brilliant, works perfectly!
Thanks a lot,

Kai
kwicky

Posts: 2
Joined: Sun Mar 21st, 2010