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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>