# [OS X TeX] colorbox

Alain Matthes alain.matthes at mac.com
Mon Jul 28 03:12:09 EDT 2008

Le 28 juil. 08 à 05:36, Alan Munn a écrit :

> At 10:28 PM -0400 7/27/08, Alain Schremmer wrote:
>> This is just a LaTeX question but I have already wasted a couple of
>> hours on it. So, I hope, Š
>>
>> I would like to have the same highlighting effect as in
>>
>> 	$f(x)$\colorbox{yellow}{$\left.\right|_{x:=-3}$}
>>
>> but of course, since the delimiters do not take the height of the
>> front into account, with
>>
>> 	$\dfrac{x}{x-1}$\colorbox{yellow}{$\left.\right|_{x:=-3}$}
>>
>> the vertical bar is too short and I am not able to move \left. to
>> the left of the fraction.
>
>
> \newlength{\foo}
> \settoheight{\foo}{$\dfrac{x}{x-1}$}
>
> $\dfrac{x}{x-1}$\colorbox{yellow}{$\left.\rule{0pt}{\foo}\right| > _{x:=-3}$}
>

Why not :

$\dfrac{x}{x-1}$\colorbox{yellow}{$\bigg|_{x:=-3}$}

Best Regards

Alain Matthes