On Sun, 29 Oct 2006, Sebastian Rooks wrote:
> Dear ConTeXters,
>
> 1/ I would like to use a named formula with a reference containing
> several subformulae each with a reference. The closer I can get to is to
> add an empty namedformula followed by subformulae (see test file below).
> How can I get rid of the empty line with a number in the pdf ?
I took a different approach to this. I had written some macros that do
automatic subformula numbering, and I added a macro there to do have a
named subformulas. See the code at the end.
> 4/ How can I redefine the \vec command in my formulae without having a
> warning "system : command \vec is already defined"
\def\vec#1{whatever}
will not give you a warning. You get a warning only if you use
\define.
> 5/ I do like a lot the minimum distribution so easy to install. It would
> be even better if bibtex can be added. It's only 82.8 KiB
bibtex is part of the minimal distribution for windows. It is in
texmf-mswin/bin/
Now, coming back to the code for subformulas. I defined a
\startnamedsubformulas[tag]{name} to take care of "named" subformulas.
This is build on top of an existing \startsubformulas ...
\stopsubformulas that do automatic numbering of subformulas. See the
examples in the end.
\unprotect
\definesystemvariable {fn} % subForMulas
% Suggestion by Hans to use fn
%D \macros{setupsubformulas}
\def\setupsubformulas
{\dodoubleargument\getparameters[\??fn]}
\definenumber
[parent\v!formula]
\def\subformulaconversion#1%
{\getnumber[parent\v!formula]%
\@@fnseparator%
\convertnumber{\@@fnconversion}{#1}}
\defineconversion[sub\v!formula\c!conversion][\subformulaconversion]
%D \macros{startsubformulas}
\def\startsubformulas%
{\dosingleempty\dostartsubformulas}
\def\dostartsubformulas[#1]%
{\incrementnumber[\v!formula]
\makesectionnumber[\v!formula]
\iffirstargument
\rawreference{\s!for}{#1}{\composedsectionnumber}
\fi
\expanded{\setupnumber
[parent\v!formula]
[start={\rawnumber[\v!formula]},
\c!way=\@@fmway,
conversion=\@@fmconversion]}
\savenumber[\v!formula]
\bgroup
\setupformulas[\c!conversion=sub\v!formula\c!conversion,\c!way=\v!by\v!text]
\resetnumber[\v!formula]}
\def\stopsubformulas%
{\restorenumber[\v!formula]
\resetlastlinewidth
\nonoindentation
\dochecknextindentation{\??fn}%
\egroup
\dorechecknextindentation} % here ?
% I have just copied the indentation checking from \stopformulas. I am not
% sure on how this works. I did not change this to take care of side
% floats
%D Named subformulas
\def\startnamedsubformulas%
{\dosingleempty\dostartnamedsubformulas}
\def\dostartnamedsubformulas[#1]#2%
{\iffirstargument
\def\next{\startsubformulas[#1]}%
\else
\let\next\startsubformulas
\fi
\setformulalistentry{#2}%
\next}
\def\stopnamedsubformulas{\stopsubformulas}
\setupsubformulas
[\c!conversion=\v!character,
\c!separator=\@@fmseparator,
\c!indentnext=\@@fmindentnext]
\protect
%D Possible features
%D * One should be able to refer to the subformula number, without the
formula
%D number, e.g., see equations 3a--c.
%D * Allow
%D a = b 1
%D c = d 2.a
%D e = f 2.b
%D g = h 3
%D Algorithm do do this automatically
%D flag = previous_subnumbered ;
%D \let\afterNR\relax
%D previous_subnumbered = false ;
%D for (each row)
%D if (subnumber_present_row == true)
%D if (previous_subnumbered == true)
%D \def\afterNR{\decrementnumber[formula]}
%D end
%D previous_subnumbered = true ;
%D else
%D previous_subnumbered = false ;
%D end
% Examples
\starttext
\placelist[formula]
\section{Math Formulas}
\startnamedsubformulas[eq:well_known]{Well Known Equalities}
\placeformula[eq:first] \startformula
1 + 0 = 1
\stopformula
\placeformula[eq:second] \startformula
1 + 1 = 2
\stopformula
\stopnamedsubformulas
\page
Other examples from an email discussion with Mojca.
\startbuffer
\placeformula \startformula
a^2 + b^2 = c^2
\stopformula
\stopbuffer
\setupsubformulas
[conversion=romannumerals]
\startsubformulas[Maxwell]
\placeformula \startformulas
\startformula \startalign
\NC \nabla\cdot\bf E \NC = \frac{\rho}{\varepsilon_0}
\NR[Maxwell 1]
\NC \nabla\times\bf E \NC = - \frac{\partial\bf B}{\partial t}
\NR[Maxwell II]
\stopalign \stopformula
\startformula \startalign
\NC \nabla\cdot \bf B \NC = 0 \NR[Maxwell III]
\NC \nabla\times\bf B \NC = \mu_0{\bf
j}+\varepsilon_0\mu_0\frac{\partial\bf E}{\partial t} \NR[Maxwell IV]
\stopalign \stopformula
\stopformulas
\stopsubformulas
Maxwell : \in [Maxwell]
II : \in [Maxwell II]
\section{conversion}
\setupformulas
[conversion=character]
\setupsubformulas
[conversion=n]
\getbuffer
\startsubformulas[subformula]
\dorecurse{2}{\getbuffer}
\placeformula[my x formula] \startformula x \stopformula
\stopsubformulas
\placeformula[my y formula] \startformula y \stopformula
reference for subformula: \in [subformula]
reference for x: \in [my x formula]
reference for y: \in [my y formula]
\setupformulas[way=bysection]
\section{a}
\getbuffer
\startsubformulas
\dorecurse{2}{\getbuffer}
\placeformula[my x2 formula] \startformula x \stopformula
\stopsubformulas
\placeformula[my y2 formula] \startformula y \stopformula
reference for x: \in [my x2 formula]
reference for y: \in [my y2 formula]
\stoptext
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