[OS X TeX] colorbox

[Alain Schremmer]

On Jul 28, 2008, at 3:12 AM, Alain Matthes wrote:

>
> 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.
>>
>> How about:
>>
>> \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}{$\bigg|_{x:=-3}$}

That would work well enough for me too except that I can't remember  
the LaTeX succession \Bigg, \bigg, etc and would have to pull out the  
LaTeX companion each time and, by now, (a) it is falling apart, (b) I  
don't use it enough to warrant buying another one and (c) I don't  
know how to reconstruct books.

Grateful regards
--schremmer