Re: Myway on using mathalign

[WN <wneimeijer01@cs.com>]

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adityam@umich.edu wrote:
> On Wed, 5 Apr 2006, WN wrote:
>> One thing I want to do with a set of subformula's is
>> to reference the main formula but still subnumbering the equations
>> like
>
> Try this. Warning: I do not know everything that is happening here. 
> There may be some unexpected side effects.
>
> \unprotect
> \def\placesubformulawithnumber{%
>   \dodoubleempty\doplacesubformulawithnumber}
>
> \def\doplacesubformulawithnumber[#1][#2]%#2 gobbles spaces
>   {\iffirstargument
>     \incrementnumber[\v!formula]
>     \makesectionnumber[\v!formula]
>     \rawreference{\s!for}{#1}{\composedsectionnumber}
>   \else
>     \incrementnumber[\v!formula]
>   \fi\placesubformula}
> \protect
>
>
>> \starttext
> %% > \incrementnumber[formula]
> %% > \placesubformula
> \placesubformulawithnumber[eqn1] %I need to think of a smaller name
>> \startformula
>> \startalign
>> \NC div  \vec{E} \NC =  \epsilon_{0}^{-1} \rho  \NR[eqn1:A][a]
>> \NC rot  \vec{E} \NC =  0 \NR
>> \NC div  \vec{B} \NC =  0 \NR[eqn1:B][b]
>> \NC rot  \vec{B} \NC =  \mu_{0} \vec{j} \NR
>> \stopalign
>> \stopformula
>> See *\in[eqn1] *for the static Maxwell equations, where we are going 
>> to examine \in[eqn1:A] a bit further ....
>> \stoptext
>>
>
> Also, note that div and rot should be in text font. You should 
> probably do
> \startmathcollection[default]
>   \definemathcommand [div]      [nolop] {\mfunction{div}}
>   \definemathcommand [rot]      [nolop] {\mfunction{rot}}
> \stopmathcollection
>
> and use \div \rot etc.
>
> HTH,
> Aditya
>
>
Hi Aditya,
I tested your solution and it works great. I cannot see any problems in 
my output.
I wish I had your Tex programming skills, I am trying to learn the 
language myself from
the TexBook (D.Knuth) but I still have a long way to go.

BTW

Thanks for your comment on the div, rot.
I indeed defined the div and rot in text font, it is defined in one of 
my environment settings.
Attached my small Context script to confirm your solution

Again thanks for your help,
Kind regards
Wim


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\unprotect

% ========= Aditya code ============
\def\placesubformulawithnumber{%
  \dodoubleempty\doplacesubformulawithnumber}

\def\doplacesubformulawithnumber[#1][#2]%#2 gobbles spaces
  {\iffirstargument
    \incrementnumber[\v!formula]
    \makesectionnumber[\v!formula]
    \rawreference{\s!for}{#1}{\composedsectionnumber}
  \else
    \incrementnumber[\v!formula]
  \fi\placesubformula}

\startmathcollection[default]
  \definemathcommand [div]      [nolop] {\mfunction{div}}
  \definemathcommand [rot]      [nolop] {\mfunction{rot}}
\stopmathcollection 
% =================================
\definereferenceformat [informula] 
    [left=(, right=), text=]

\protect 

\starttext
Some math tests, use of formula/subformula numbering.
\placesubformulawithnumber[kem-chapter1-eqn1]
\startformula
\startalign
\NC \div  \vec{E} \NC =  \frac{\rho}{\epsilon_{0}}\NR[kem-chapter1-eqn1:A][a]
\NC \rot  \vec{B}  \NC =  \mu_{0}  \:\vec{j}          \NR[kem-chapter1-eqn1:B][b]
\NC \div  \vec{B} \NC =  0                        \NR[kem-chapter1-eqn1:C][c]
\NC \rot  \vec{E} + \frac{\partial \vec{B} }{\partial t} \NC = 0  \NR[kem-chapter1-eqn1:D][d]
\stopalign
\stopformula
See \informula[kem-chapter1-eqn1] or alternatively
\informula[kem-chapter1-eqn1:A], \informula[kem-chapter1-eqn1:B],\informula[kem-chapter1-eqn1:C] or
\informula[kem-chapter1-eqn1:D].
\blank
Another test to check that the formula numbers work as expected
\placeformula[kem-chapter-eqn11]
\startformula
\cases{
\eqalign{
\widehat{\vec{x}} &= - \vec{x} \cr
\widehat{t} & = t \cr
}}
\quad \text{resp.} \quad
\cases{\eqalign{
\widehat{\vec{x}} &=  \vec{x} \cr
\widehat{t} & = -t \cr
}}
\stopformula

\stoptext


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