I try to replicate the following : https://mailman.ntg.nl/pipermail/ntg-context/2006/021038.html (i.e. the equivalent of \tag in latex/amsmath). More precisely this:

%------------------------8<--------------------------
\def\placeformulatag%
   {\dosingleempty\doplaceformulatag}
\def\doplaceformulatag[#1]#2%
   {\let\normalstopformula\stopformula
    \def\stopformula%
     {\normalstopformula
      \restorenumber[formula]
      \egroup
      \let\stopformula\normalstopformula}
      \bgroup
      \savenumber[formula]
      \def\dummyconversion##1{#2}
      \defineconversion[dummyconversion][\dummyconversion]
      \setupformulas[conversion=dummyconversion]
      \placeformula[#1]}

\starttext
\placeformulatag[tag]{test} \startformula
   E = mc^2
\stopformula
See \in formula[tag] for a tagged formula
\stoptext
%----------------------------8<-------------------------

However, the following (simpler) code produce an "Undefined control sequence" when using \in command.

\starttext
{
  \def\a#1{test}
  \defineconversion[a][\a]
  \setupformulae[numberconversion=a]
  \placeformula[test]
  \startformula E = mc^2 \stopformula
}
This is my reference: \in{formula}[test].
\stoptext

The following code, does not produce the error, but is not practical for the reproducing the \tag command.

\starttext
{
  \def\a#1{test}
  \defineconversion[a][\a]
  \setupformulae[numberconversion=a]
  \placeformula[test]
  \startformula E = mc^2 \stopformula
  This is my reference: \in{formula}[test].
}
\stoptext

What am I doing wrong? I guess the command \a is no longer defined when the compiler hit \in but how can I ensure that such local definition stay accessible ?

Thank you in advance,

Antoine C.

On 27 February 2017 at 17:28, Antoine Cailliau <antoinecailliau@gmail.com> wrote:

Thanks. 

I updated the wiki.

On 27 February 2017 at 17:18, Pablo Rodriguez <oinos@gmx.es> wrote:

On 02/27/2017 04:55 PM, Antoine Cailliau wrote:
> The following code is documented to change the numbering of the equations.
> However, this still use numerals for the equations.
> [...]
> Is this a bug ? Is it the correct way to change the numbering ?

Hi Antoine,

it’s numberconversion (as it reads in “ConTeXt Commands”):

    \setupformulas[numberconversion=greek]
    \setupbodyfont[dejavu]
    \starttext
    \placeformula[test]
    \startformula E = mc^2 \stopformula
    \stoptext

BTW, if this is wrong documented in the wiki, please correct it for
future reference.

Pablo
--
http://www.ousia.tk
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