Thanks, Florent,
The vertical bars look good, but the numerators and denominators are placed
flush left instead of centered, which looks odd in cases like \cFrac{99999}{1}.
Matthias
> On Jun 14, 2026, at 1:13 PM, Florent Michel <[email protected]> wrote:
>
> Hi,
>
> This is a bit of a hack (and I'm sure there are better solutions), but maybe
> something like the following?
>
> \define[2]\cFrac{%
> \vcenter{
> \newdimen\WidthOfFirst
> \newdimen\WidthOfSecond
> \newdimen\TrueWidth
> \WidthOfFirst=\widthofstring{\strut$#1$\,}
> \WidthOfSecond=\widthofstring{\strut\vrule\,$#2$}
> \startluacode
> trueWidth = math.max(tex.dimen.WidthOfFirst, tex.dimen.WidthOfSecond)
> context("\\TrueWidth=" .. trueWidth .. "sp")
> \stopluacode
>
> \hbox{\offset[width=\TrueWidth]{\strut$#1$\,}\vrule}\hrule\hbox{\strut\vrule\,$#2$}}%
> }
>
> \starttext
> \startformula
> \startalign
> \NC a_0+a_0a_1+a_0 a_1 a_2+a_0 a_1 a_2 a_3 \NC =
> \cfrac{a_0}{1-\cfrac{a_1}{1+a_1-\cfrac{a_2}{1+a_2-\cfrac{a_2}{1+a_2-\cfrac{a_3}{1+a_3-\cdots}}}}}\NR
> %\NC \NC =
> \frac{a_0|}{|1}-\frac{a_1|}{|1+a_1}-\frac{a_2|}{|1+a_2}-\frac{a_3|}{|1+a_3}-\cdots\NR
> \NC \NC =
> \cFrac{a_0}{1}-\cFrac{a_1}{1+a_1}-\cFrac{a_2}{1+a_2}-\cFrac{a_3}{1+a_3}-\cdots\NR
> \stopalign
>
> \stopformula
> \stoptext
>
> Cheers,
> Florent
>
> Le dim. 14 juin 2026 à 17:26, Matthias Weber <[email protected]
> <mailto:[email protected]>> a écrit :
>> Dear All,
>>
>>
>> I would like to typeset continued fractions as attempted and failed in the
>> second line of the following MWE:
>>
>> \def\cFrac#1#2{%
>> \vcenter{\hbox{\strut$#1$\,\vrule}\hrule\hbox{\strut\vrule\,$#2$}}}
>>
>> \starttext
>> \startformula
>> \startalign
>> \NC a_0+a_0a_1+a_0 a_1 a_2+a_0 a_1 a_2 a_3 \NC =
>> \cfrac{a_0}{1-\cfrac{a_1}{1+a_1-\cfrac{a_2}{1+a_2-\cfrac{a_2}{1+a_2-\cfrac{a_3}{1+a_3-\cdots}}}}}\NR
>> %\NC \NC =
>> \frac{a_0|}{|1}-\frac{a_1|}{|1+a_1}-\frac{a_2|}{|1+a_2}-\frac{a_3|}{|1+a_3}-\cdots\NR
>> \NC \NC =
>> \cFrac{a_0}{1}-\cFrac{a_1}{1+a_1}-\cFrac{a_2}{1+a_2}-\cFrac{a_3}{1+a_3}-\cdots\NR
>> \stopalign
>>
>> \stopformula
>> \stoptext
>>
>>
>> The macro is from
>>
>> https://tex.stackexchange.com/questions/68190/how-do-i-typeset-continued-fractions-in-pringsheims-concise-notation
>>
>> where this question is discussed for LaTeX.
>>
>> Unfortunately, the vertical bars on the top of the fractions do not align
>> with the right end of the fraction bar.
>>
>>
>> Any suggestions?
>>
>> Thanks,
>>
>> Matthias
>>
>>
>>
>>
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> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the
> Wiki!
>
> maillist : [email protected] /
> https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl
> webpage : https://www.pragma-ade.nl / https://context.aanhet.net (mirror)
> archive : https://github.com/contextgarden/context
> wiki : https://wiki.contextgarden.net
> ___________________________________________________________________________________
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the
Wiki!
maillist : [email protected] /
https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl
webpage : https://www.pragma-ade.nl / https://context.aanhet.net (mirror)
archive : https://github.com/contextgarden/context
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