Renaud AUBIN wrote:
>I've read the post [NTG-context] Math Cases and I'm interested to have
>the possibility to do this kind of numbering:
>
> { b , if whatever (1a)
> a ={
> { c, otherwise (1b)
>
>
>
>>If I understand you correctly, then something like this
>>
>>\definealign[cases][left={\left\{}, right={\right.}, n=2,
>>align={left,left}]
>>
>>will give us \startcases, \stopcases which works like \cases. Such a
>>feature will be very useful.
>>
>>
>>Is it possible to define left|right in such a way that
>>\definealign[important][left={\framed\bgroup},right={\egroup}]
>>results in a frame around the equations (and does not include the equation
>>numbers), that is the frame is as broad as the width of the largest
>>equation that follows. This mechanism can be used to highlight equations.
>>
>>Also, in another post, I had asked if it is possible to have cases that
>>are numbered, that is, can I get
>>
>> { b , if whatever (1a)
>> a ={
>> { c, otherwise (1b)
>>
>>This is not important, but will be nice to have.
>>
>>
something like this?
\unprotect
\definesystemvariable{ce}
\def\v!mathcases {mathcases}
\def\c!numberdistance{numberdistance}
\def\setupmathcases
{\dodoubleempty\dosetupmathcases}
\def\dosetupmathcases[#1][#2]%
{\ifsecondargument
\getparameters[\??ce#1][#2]%
\else
\getparameters[\??ce][#1]%
\fi}
\let\currentmathcases\empty
\def\mathcasesparameter#1%
{\executeifdefined{\??ce\currentmathcases#1}{\executeifdefined{\??ce#1}\empty}}
\setupmathcases
[\c!distance=1em,
\c!numberdistance=2.5em]
\def\definemathcases
{\dodoubleempty\dodefinemathcases}
\def\dodefinemathcases[#1]% [#2]%
{\setvalue{\e!start#1}{\dodoubleempty\dostartmathcases[#1]}%
\setvalue{\e!stop #1}{\dostopmathcases}%
\setupmathcases[#1]}% [#2]
\definemathcases[cases]
\definemathcases[\v!mathcases]
\def\dodocasesNC
{\gdef\docasesNC{\endmath&}}
\let\docasesNR\doalignNR
\def\dostartmathcases[#1][#2]%
{\begingroup
\edef\currentmathcases{#1}%
\doifassignmentelse{#2}{\setupmathcases[#1][#2]}\donothing
\left\{%
\,%
\vcenter\bgroup
\pushmacro\docasesNC
\let\endmath\relax
\def\NC{\docasesNC}%
\def\MC{\docasesNC\ifmmode\else$\def\endmath{$}\fi}%
\global\let\docasesNC\dodocasesNC
\def\NR{\endmath&\global\let\docasesNC\dodocasesNC\doxxdoubleempty\docasesNR}%
\normalbaselines
\mathsurround\zeropoint
\everycr\emptytoks
\tabskip\zeropoint
\global\eqaligncolumn\plusone
\halign\bgroup
\span$##$\hfil
&\hskip\mathcasesparameter\c!distance\relax\popmacro\docasesNC##\hfil
&\hskip\mathcasesparameter\c!numberdistance\relax\span\textineqalign{##}%
\crcr} % todo: number
\def\dostopmathcases
{\crcr
\egroup
\popmacro\docasesNC
\egroup
\right.
\endgroup}
\protect
\showframe
\placeformula \startformula \startcases
\NC 2 \NC $ y > 0 $ \NR
\NC 7 \NC $ x = 7 $ \NR[+]
\NC 4 \NC otherwise \NR
\stopcases \stopformula
\placeformula \startformula x
\startcases
\NC 2 \NC $ y > 0 $ \NR[+]
\NC 7 \NC $ x = 7 $ \NR
\NC 4 \NC otherwise \NR
\stopcases
\stopformula
\placeformula \startformula \startcases
\NC 2 \NC $ y > 0 $ \NR
\NC 7 \NC $ x = 7 $ \NR
\NC 4 \NC otherwise \NR
\stopcases \stopformula
\placeformula \startformula x
\startcases
\NC 2 \NC $ y > 0 $ \NR
\NC 7 \NC $ x = 7 $ \NR
\NC 4 \NC otherwise \NR
\stopcases
\stopformula
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