Hi,
Attached is a new version of math-ext
- multiple columns
- alignment per column
See examples in source (mixed &|cr and NC|NR is no longer supported).
That's all the math for this week.
Hans
%D \module
%D [ file=math-ext,
%D version=2006.01.14,
%D title=\CONTEXT\ Math Macros,
%D subtitle=Extra Macros,
%D author={Hans Hagen \& Taco Hoekwater},
%D date=\currentdate,
%D copyright=\PRAGMA]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.
%D This will go into core-mat
%M \ifx\startalign\undefined \input math-ext.tex \fi
% some simple math constructs (based on user requests)
%
% preliminary
\unprotect
% adapted stuff
% we need to make this plain code a bit more 'readable'
\def\openup
{\afterassignment\dopenup\scratchdimen=}
\def\dopenup
{\advance\lineskip \scratchdimen
\advance\baselineskip \scratchdimen
\advance\lineskiplimit\scratchdimen}
\def\jot{.25\bodyfontsize} % plain tex: 3 pt (todo: better name)
[EMAIL PROTECTED]
[EMAIL PROTECTED] % \presetdisplayspacing or so
[EMAIL PROTECTED]
\openup\jot
\mathsurround\zeropoint
\everycr{\noalign{%
[EMAIL PROTECTED]
[EMAIL PROTECTED]
\ifdim\prevdepth>-\thousandpoint
\vskip-\lineskiplimit
\vskip\normallineskiplimit
\fi
\else
\penalty\interdisplaylinepenalty
\fi}}}
% context (hooks)
[EMAIL PROTECTED]@y
[EMAIL PROTECTED]@y}
[EMAIL PROTECTED]
% plain tex value: \centering = 0pt plus 1000pt minus 1000pt
% plain tex valye: \jot = 3pt
% n>1 #### needed, strange # interaction (maybe we need a toks in
recurse ane no macro)
\def\buildeqalign
{\scratchtoks\emptytoks
\dorecurse{\mathalignparameter\c!m}
{\ifnum\recurselevel>\plusone
\appendtoks
\tabskip\mathalignparameter\c!distance&\tabskip\zeropoint
\to\scratchtoks
\fi
\expanded{\scratchtoks{\the\scratchtoks\the\!!toksa}}%
\dorecurse{\numexpr\mathalignparameter\c!n-\plusone\relax}
{\expanded{\scratchtoks{\the\scratchtoks\the\!!toksb}}}}%
\expanded{\scratchtoks{\the\scratchtoks\the\!!toksc}}}
\def\forgetalign
{\tabskip\zeropoint\everycr\emptytoks}
\let\firstineqalign\empty
\let\nextineqalign \empty
\let\leftofeqalign \empty
\let\rightofeqalign\empty
\def\mathineqalign#1{$\forgetalign\displaystyle{{}#1{}}$}
\def\textineqalign#1{$\forgetalign#1$}
\def\eqalign#1% why no halign here, probably because of displaywidth
{\!!toksa{\strut\hfil$\displaystyle{##}$}%
\!!toksb{&$\displaystyle{{}##{}}$\hfil}%
\!!toksc\emptytoks
\buildeqalign
\null\,\vcenter
{\openup\jot
\mathsurround\zeropoint
\expandafter \ialign \expandafter {\the\scratchtoks\crcr#1
\crcr}%
}\,}
% preamble is scanned for tabskips so we need the span to prevent
an error message
\def\prepareeqalignno
{\!!toksa{\strut\firstineqalign\hfil\leftofeqalign\span
\mathineqalign{##}\rightofeqalign\tabskip\zeropoint}%
\!!toksb{&\nextineqalign\leftofeqalign\span\mathineqalign{##}
\rightofeqalign\tabskip\zeropoint}%
\!!toksc{\hfil\tabskip\centering&\llap{\span\textineqalign{##}}
\tabskip\zeropoint}%
\buildeqalign
\presetdisplaymath
\tabskip\centering}
\def\prepareleqalignno
{\!!toksa{\strut\firstineqalign\hfil\leftofeqalign\span
\mathineqalign{##}\rightofeqalign\tabskip\zeropoint}%
\!!toksb{&\nextineqalign\leftofeqalign\span\mathineqalign{##}
\rightofeqalign\tabskip\zeropoint}%
\!!toksc{\hfil\tabskip\centering&\kern-\displaywidth\rlap{\span
\textineqalign{##}}\tabskip\displaywidth}%
\buildeqalign
\presetdisplaymath
\tabskip\centering}
\chardef\eqalignmode=1
\def\eqalignno#1%
{\prepareeqalignno
\halign \ifcase\eqalignmode \or to \displaywidth \fi [EMAIL PROTECTED] {\the
\scratchtoks\crcr#1\crcr}}
\def\leqalignno#1%
{\prepareleqaligno
\halign \ifcase\eqalignmode \or to \displaywidth \fi [EMAIL PROTECTED] {\the
\scratchtoks\crcr#1\crcr}}
\def\aligneqalignno
{\prepareeqalignno
\halign \ifcase\eqalignmode \or to \displaywidth \fi [EMAIL PROTECTED] \bgroup
\the\scratchtoks\crcr}
\def\alignleqalignno
{\prepareleqalignno
\halign \ifcase\eqalignmode \or to \displaywidth \fi [EMAIL PROTECTED] \bgroup
\the\scratchtoks\crcr}
\def\finishalignno
{\crcr\egroup}
\definesystemvariable{eq}
\def\setupmathalign
{\dodoubleempty\dosetupmathalign}
\def\dosetupmathalign[#1][#2]%
{\ifsecondargument
\getparameters[\??eq#1][#2]%
\else
\getparameters[\??eq][#1]%
\fi}
\let\currentmathalign\empty
\def\mathalignparameter#1%
{\executeifdefined{\??eq\currentmathalign#1}{\executeifdefined{\??
eq#1}\empty}}
\setupmathalign
[\c!n=2,
\c!m=1,
\c!distance=1em]
\def\numberedeqalign
{\doifelse\@@fmlocation\v!left\alignleqalignno\aligneqalignno}
\def\doxxdoubleempty#1#2%
{\ifx#2[\expandafter\dodoxxdoubleempty\else\expandafter
\noxxdoubleempty\fi#1#2}
\def\dodoxxdoubleempty#1[#2]#3%
{\ifx#3[\else\expandafter\nonoxxdoubleempty\fi#1[#2]#3}
\def\noxxdoubleempty #1{#1[][]}
\def\nonoxxdoubleempty#1[#2]{#1[#2][]}
\newcount\eqaligncolumn
\def\firstineqalign{\global\eqaligncolumn\plusone}
\def\nextineqalign {\global\advance\eqaligncolumn\plusone}
\def\leftofeqalign {\getvalue{\??eq:\v!left :\number\eqaligncolumn}}
\def\rightofeqalign{\getvalue{\??eq:\v!right:\number\eqaligncolumn}}
\def\doseteqaligncolumn#1%
{\letvalue{\??eq:\v!left :\number\eqaligncolumn}\empty
\letvalue{\??eq:\v!right:\number\eqaligncolumn}\empty
\doif{#1}\v!left {\letvalue{\??eq:\v!right:\number
\eqaligncolumn}\hfill}%
\doif{#1}\v!right {\letvalue{\??eq:\v!left :\number
\eqaligncolumn}\hfill}%
\doif{#1}\v!middle{\letvalue{\??eq:\v!right:\number
\eqaligncolumn}\hfill
\letvalue{\??eq:\v!left :\number
\eqaligncolumn}\hfill}}
\def\dodoalignNC
{\gdef\doalignNC##1{&##1}}
\def\doalignNR[#1][#2]%
{\doifsomething{#1}
{\doifelse{#1}{+}
{\doformulanumber[][#2][]{}}
{\doformulanumber[#1][#2][]{}}}%
\crcr}
\def\dostartmathalign[#1][#2]%
{\pushmacro\doalignNC
\edef\currentmathalign{#1}%
\doifassignmentelse{#2}{\setupmathalign[#1][#2]}\donothing
\def\NC{\doalignNC}%
\global\let\doalignNC\dodoalignNC
\def\EQ{&=}%
\def\NR{&\global\let\doalignNC\dodoalignNC\doxxdoubleempty
\doalignNR}%
% amstex compatibility mode: (ugly)
\def\notag{\def\\{&\crcr}}%
\doifelse{#2}{*}{\def\\{&\crcr}}{\def\\{&\doalignNR[+][]\crcr}}%
% end of compatibility mode
\eqaligncolumn\zerocount
\processcommacommand[\mathalignparameter\c!align]{\advance
\eqaligncolumn\plusone\doseteqaligncolumn}%
% the real action
\global\eqaligncolumn\plusone
\numberedeqalign}
\def\dostopmathalign
{\finishalignno
\popmacro\doalignNC}
\def\definemathalign
{\dodoubleempty\dodefinemathalign}
\def\dodefinemathalign[#1]% [#2]%
{\setvalue{\e!start#1}{\dodoubleempty\dostartmathalign[#1]}%
\setvalue{\e!stop #1}{\dostopmathalign}%
\setupmathalign[#1]}% [#2]
\definemathalign[align] % default case
% \def\startsplit
% {\startalign[*]} % no number by default
%
% \def\stopsplit
% {&\doalignNR[+][]\crcr % for a number on last line
% \stopalign}
%D \startbuffer
%D \placeformula \startformula \eqalignno {
%D a &= b & \formulanumber \cr
%D c &= d \cr
%D &= e \cr
%D &= f & \formulanumber
%D } \stopformula
%D \stopbuffer
%D
%D \typebuffer \getbuffer
%D
%D \startbuffer
%D \placeformula \startformula \startalign
%D \NC a \EQ b \NR[+]
%D \NC c \EQ d \NR
%D \NC \EQ f \NR[for:demo-a-1]
%D \NC \EQ g \NR[for:demo-a-2][a]
%D \NC \EQ h \NR[for:demo-a-3][b]
%D \NC \EQ i \NR
%D \stopalign \stopformula
%D \stopbuffer
%D
%D \typebuffer \getbuffer
%D
%D \startbuffer
%D \placeformula \startformula \startalign
%D \NC a \EQ b \NR[+]
%D \NC c \EQ d \NR
%D \NC \EQ f \NR
%D \NC \EQ g \NR
%D \NC \EQ h \NR
%D \NC \EQ i \NR[+]
%D \stopalign \stopformula
%D \stopbuffer
%D
%D \typebuffer \getbuffer
%D
%D \startbuffer
%D \placeformula \startformula \startalign
%D a &= b \\
%D c &= d \notag \\
%D &= e \notag \\
%D &= f \\
%D \stopalign \stopformula
%D \stopbuffer
%D
%D \typebuffer \getbuffer
%D
%D \startbuffer
%D \placeformula \startformula \startalign
%D \NC a \NC \eq b \NR[+]
%D \NC c \NC \neq d \NR
%D \NC \NC \neq f \NR[for:demo-b-1]
%D \NC \NC \geq g \NR[for:demo-b-2][a]
%D \NC \NC \leq h \NR[for:demo-b-3][b]
%D \NC \NC \neq i \NR
%D \stopalign \stopformula
%D \stopbuffer
%D
%D \typebuffer \getbuffer
%D
%D \startbuffer
%D \placeformula \startformula \startalign[*]
%D a &= b \\
%D c &= d \\
%D &= e \\
%D &= f \\
%D \stopalign \stopformula
%D \stopbuffer
%D
%D \typebuffer \getbuffer
%D
%D \startbuffer
%D \placeformula \startformula \startalign
%D x &= y \\
%D a &= b \\
%D \stopalign \stopformula
%D \stopbuffer
%D
%D \typebuffer \getbuffer
%D
%D \startbuffer
%D \placeformula \startformula \startalign[m=3]
%D x &= y & x &= y & z &= t \\
%D a &= b & p &= q & w &= s \\
%D \stopalign \stopformula
%D \stopbuffer
%D
%D \typebuffer \getbuffer
%D
%D \startbuffer
%D \placeformula \startformula \startalign[m=3,distance=0pt]
%D x &= y &= x &= y &= z &= t \\
%D a &= b &= p &= q &= w &= s \\
%D \stopalign \stopformula
%D \stopbuffer
%D
%D \typebuffer \getbuffer
%D
%D \startbuffer
%D \placeformula \startformula \startalign[n=5,distance=0pt]
%D x &= yy &= xx &= yy &= zz \\
%D a &= b &= p &= q &= w \\
%D \stopalign \stopformula
%D \stopbuffer
%D
%D \typebuffer \getbuffer
%D
%D \startbuffer
%D \placeformula \startformula \startalign[n=3,align=
{left,middle,right}]
%D \NC l \NC = \NC r \NR
%D \NC left \NC = \NC right \NR
%D \stopalign \stopformula
%D \stopbuffer
%D
%D \typebuffer \getbuffer
%D
%D \startbuffer
%D \placeformula \startformula \startalign[n=3,align=
{right,middle,left}]
%D \NC l \NC = \NC r \NR
%D \NC left \NC = \NC right \NR
%D \stopalign \stopformula
%D \stopbuffer
%D
%D \typebuffer \getbuffer
%D
%D \startbuffer
%D \placeformula \startformula \startalign[n=3,align=
{middle,middle,middle}]
%D \NC l \NC = \NC r \NR
%D \NC left \NC = \NC right \NR
%D \stopalign \stopformula
%D \stopbuffer
%D
%D \typebuffer \getbuffer
% BEGIN OF PATCH (CORE-MAT.TEX)
\def\doplaceformula[#1][#2]% #2 = dummy, gobbles spaces
{\def\redoplaceformula
{\bgroup
\ifx\next\bgroup
\egroup [EMAIL PROTECTED] % [ref]{}
\else
\def\nextnext{$}%
\ifx\next\nextnext
\egroup [EMAIL PROTECTED] % [ref]$$
\else
\egroup [EMAIL PROTECTED] % [ref]\start
\fi
\fi[#1]{}}%
\futurelet\next\redoplaceformula}
\long\def\moreplaceformula[#1]#2#3#4% #2 dummy #4 gobbles spaces
{\def\redoplaceformula
{\bgroup
\def\nextnext{$}%
\ifx\next\nextnext
\egroup [EMAIL PROTECTED] % [ref]$$
\else
\egroup [EMAIL PROTECTED] % [ref]\start
\fi
[#1]{#3}}%
\futurelet\next\redoplaceformula#4}
% END OF PATCH
\def\startformulas#1\stopformulas
{\bgroup
\forgetdisplayskips
\startdisplaymath
\setlocalhsize
\long\def\startformula##1\stopformula{\advance\scratchcounter
\plusone}%
\scratchcounter\zerocount #1% preroll
\divide \hsize \scratchcounter
\hbox to \localhsize \bgroup
\hss
\def\normalstartformula{\vskip-\strutdepth$$}% i hate this
\def\normalstopformula {$$}%
% \def\jot{0pt}%
\def\startformula{$\vcenter\bgroup\normalstartformula}%
\def\stopformula {\normalstopformula\egroup$\hss}%
#1%
\egroup
\stopdisplaymath
\egroup}
%D \startbuffer
%D \placeformula
%D \startformula
%D \startalign[n=3,align={middle,middle,middle}]
%D \NC a \NC = \NC b \NR[+]
%D \NC 2a \NC = \NC 2b \NR
%D \stopalign
%D \stopformula
%D \stopbuffer
%D
%D \typebuffer \getbuffer
%D
%D \startbuffer
%D \placeformula
%D \startformulas
%D \setupmathalign[n=3,align={middle,middle,middle}]%
%D \startformula
%D \startalign
%D \NC a \NC = \NC b \NR[+]
%D \NC 2a \NC = \NC 2b \NR
%D \stopalign
%D \stopformula
%D \startformula
%D \startalign
%D \NC a \NC = \NC b \NR[+]
%D \NC 2a \NC = \NC 2b \NR
%D \stopalign
%D \stopformula
%D \stopformulas
%D \stopbuffer
%D
%D \typebuffer \getbuffer
%D
%D \startbuffer
%D \placeformula
%D \startformulas
%D \dorecurse{5}{\startformula
%D \startalign[n=3,align={middle,middle,middle}]
%D \NC a \NC = \NC b \NR[+]
%D \NC 2a \NC = \NC 2b \NR
%D \stopalign
%D \stopformula}
%D \stopformulas
%D \stopbuffer
%D
%D \typebuffer \getbuffer
\protect \endinput
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