Re: formula label

[Wolfgang Schuster <schuster.wolfgang@googlemail.com>]

Am 04.12.2008 um 15:30 schrieb Hans Hagen:

> Steffen Wolfrum wrote:
>> Am 04.12.2008 um 14:28 schrieb Wolfgang Schuster:
>>
>>> Am 04.12.2008 um 12:46 schrieb Steffen Wolfrum:
>>>
>>>> Hi,
>>>>
>>>> this code
>>>> \setupformulas[location=left]
>>>> \placeformula \startformula
>>>> K = V + W(V) × S (Gleichung 1)
>>>> \stopformula
>>>>
>>>> gives, as expected:
>>>> (1.1) K = V + W(V ) × S
>>>>
>>>> But I need the following label ("Gleichung" means "formula"):
>>>> (Gleichung 1) K = V + W(V ) × S
>>>>
>>>> How can this be done (in Mk II) ?
>>> In the same way as you do it in MkIV :)
>>>
>>> \setupformulas[way=bytext]
>>> \setuplabeltext[de][formula=Gleichung~]
>>
>>
>> Two remarks:
>>
>> 1) In this case the equation is not centered to textwidth anymore. It
>> is centered to the space that's left.
>>
>> 2) And what about if the author wants to add a footnote to this
>> respective formula?
>>
>> An example could look like the following fake:
>> \noindent(Gleichung 2)\note[339]\hfill{$1 =  -W'(V^*) × S$}\hfill
>> \hphantom{(Gleichung 2)\note[339]}
>
> maybe putting  \postponefootnotes in front of the formula helps  
> (future
> mkiv versions might solve this in a better way; it has to do with the
> fact that one cannot use inserts too deeply nested in tex constructs

This did solve it, here is new version for you, Steffen.

\setupformulas[way=bytext]

\let\theformulanote\relax

\define[1]\formulanote
   {\def\theformulanote{#1}}%

\def\placeformulanote
   {\doiftext\theformulanote{\postponefootnotes 
\footnote{\theformulanote}}}

\define[1]\FormulaNumber
   {\rlap{(Gleichung~#1)\placeformulanote}}

\setupformulas
   [left=,
    right=,
    numbercommand=\FormulaNumber,
    location=left]

\starttext

\chapter{dummy}

\placeformula
\startformula
\formulanote{one}
K = V + W(V) \times S
\stopformula

text\footnote{text}

\placeformula
\startformula
\formulanote{two}
K = V + W(V) \times S
\stopformula

\stoptext

Wolfgang

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