[NTG-context] Fwd: Continued fractions in ConTeXt

[Jairo A. del Rio]

I've just tested it and it looks w a y better than before (thanks!). Btw,
where could I read about key-value pairs for ConTeXt fractions
(\definemathfraction)? I've seen keys like "threshold" and other weird ones
in the command list, so I ask about a reference (maybe somewhere in a
manual; the Garden doesn't say a lot about it). Thank you very much.

Sincerely,

Jairo :)

El lun., 29 de jun. de 2020 a la(s) 09:51, Hans Hagen (j.hagen at xs4all.nl)
escribió:

> On 6/28/2020 6:06 PM, Jairo A. del Rio wrote:
> > |Hi list! I've tried adapting the following code for continued
> fractions:|
> > ||
> >
> > |%
> https://tex.stackexchange.com/questions/73195/how-to-typeset-a-continued-fraction-in-the-following-format
> >
> \documentclass{article}\usepackage{amsmath}\begin{document}\newcommand*{\cofrac}[2]{%{%\rlap{$\dfrac{1}{\phantom{#1}}$}%\genfrac{}{}{0pt}{0}{}{#1+#2}%}%}\[a_0
>
> > +
> >
> \cofrac{a_1}{\cofrac{a_2}{\cofrac{a_3}{\genfrac{}{}{0pt}{0}{}{\ddots}}}}\]\end{document}
> >
> > |
> >
> > |As I could read from the mailing list, ConTeXt no longer supports
> > \genfrac, so I've tried
> > |
> >
> > |the following using \definemathfraction
> >
> > \definemathfraction[gefrac][cfrac]
> > \setupmathfraction[gefrac][rule=no]
> > \def\cofrac#1#2{%
> >    {%
> >      \rlap{\cfrac{1}{\displaystyle\phantom{#1}}}%
> >      \gefrac{}{\displaystyle\gefrac{#1+}{}#2}%
> >    }%
> > }
> > \def\cofracnorule#1#2{%
> > {%
> > \rlap{\gefrac{\displaystyle\phantom{1}}{\displaystyle\phantom{#1}}}%
> > \gefrac{}{\displaystyle\gefrac{#1}{}#2}%
> > }%
> > }
> > \def\endfrac#1{\cofracnorule{#1}{\phantom{1}}}
> > \startTEXpage
> > \startplacefigure[location=force,number=no]
> > \externalfigure[cofrac.png]
> > \stopplacefigure
> > \startformula
> > \alpha +
> >
> \cofrac{\alpha'}{\cofrac{\alpha''}{\cofrac{\alpha'''}{{\endfrac{\ddots}}}}}
> > \frac{1}{\alpha'''}
> > \stopformula
> > \stopTEXpage
> >
> > |
> >
> > |Mmm, superscripts and fraction rules superpose, so indeed something is
> > wrong. Any ideas or references to a better result?
> > |
> In the next version this will look okay:
>
> \definemathfraction
>    [gefrac]
>    [d:frac]
>
> \setupmathfraction
>    [gefrac]
>    [mathstyle=display,
>     alternative=inner,
>     rule=hidden]
>
> \unexpanded\def\cofrac#1#2{%
>      \rlap{\cfrac{1}{\phantom{#1}}}%
>      \gefrac{}{\gefrac{#1+}{}#2}%
> }
>
> \unexpanded\def\endfrac#1{%
>      \rlap{\phantom{\cfrac{1}{#1}}}%
>      \gefrac{}{#1}%
> }
>
> \starttext
>
> \startTEXpage
> \startformula \showmakeup[kern]
>          \alpha
>          +
>          \cofrac {\alpha'}
>              {\cofrac {\alpha''}
>                  {\cofrac {\alpha'''}
>                      {\endfrac {\ddots}}}}
>          +
>          \frac{1}{\alpha'''}
>      \stopformula
> \stopTEXpage
>
> \stoptext
>
>
> -----------------------------------------------------------------
>                                            Hans Hagen | PRAGMA ADE
>                Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>         tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
> -----------------------------------------------------------------
>
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