On Tue, 8 Aug 2006, Aditya Mahajan wrote:
[ A long list of feature requests ]
Here is something that was not in my original list: subformula
numbering.
Context allows one to number subformulas by specifying the subnumber.
Thus, if I want (1a) (1b) and (1c), I need to do
\placesubformula[+]{a} ....
\placesubformula[+]{b} ....
\placesubformula[+]{c} ....
Basically, do the numbering by hand. This is fine if there are only a
few formulas, but there are some drawbacks of this approach. Firstly,
if at a later stage you decide to move the equations around, you need
to retype the formula numbers. Also, you need to remember to increment
the formula numbers at the right time.
I was thinking of a better (rather more familar) way of treating
subformulas by imitating the \begin{subequations} ....
\end{subeqations} environment of latex.
I propose a \startsubformula .... \stopsubformula environment, so
that inside it, I will get subformula numbers rather than formula
numbers. Having discovered conversions (see my previous mail on tagged
formulas), I tried to implement it using conversions. The following
straightforward approach works fine. This is just a stop gap code, I
do not take care of inherting the right settings for formulas, but
it conveys the idea.
%--------------------------8<------------------------------------
\definenumber[tempformula]
\def\subformulaconversion#1{\getnumber[tempformula]\character{#1}}
% character should be modifiable using \setupsubformulas
\defineconversion[subformulaconversion][\subformulaconversion]
\def\startsubformulas%
{\incrementnumber[formula]
\expanded{\setupnumber[tempformula][start={\rawnumber[formula]}]}
\savenumber[formula]
\setupformulas[conversion=subformulaconversion]
% way should be set to bytext
\resetnumber[formula]
}
\def\stopsubformulas%
{\setupformulas[conversion=numbers]
% conversion should be inherited from setupformulas
% way should be restored to whatever it was earlier
\restorenumber[formula]}
\startbuffer
\placeformula \startformula
a^2 + b^2 = c^2
\stopformula
\stopbuffer
\starttext
\dorecurse{3}{\getbuffer}
Lets start subformulas
\startsubformulas
\dorecurse{3}{\getbuffer}
\stopsubformulas
Also works inside alignments
\startsubformulas
\placeformula \startformula \startalign
\NC A \EQ B + C \NR[first]
\NC D \EQ E + F \NR[+]
\stopalign \stopformula
\stopsubformulas
Notice that in \in formula[first] we get the correct reference.
\dorecurse{3}{\getbuffer}
\stoptext
%----------------------------8<---------------------------------------
Hans and Taco, can something like this be added to the core? If so, I
will try to make this macro more robust (correct inheritence, etc.)
Aditya
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