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authorKarl Berry <karl@freefriends.org>2010-02-21 23:19:14 +0000
committerKarl Berry <karl@freefriends.org>2010-02-21 23:19:14 +0000
commitebbe8a461c949a3c9390cb81b9fbc6ac30128203 (patch)
treec9adca721a0d0322bd45e05cac6f14cb90c2e030 /Master/texmf-dist/tex/latex/ltxmisc
parent184ae71245a852b75f27e12f72d58c1c2a9ebc00 (diff)
cases doc update, own package (21feb09)
git-svn-id: svn://tug.org/texlive/trunk@17123 c570f23f-e606-0410-a88d-b1316a301751
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-% C A S E S . S T Y ver 2.5 May 2002
-%
-% Copyright (C) 1993,1994,1995,2000,2002 by Donald Arseneau
-% asnd@triumf.ca
-% These macros may be freely transmitted, reproduced, or modified
-% provided that this notice is left intact. Sub-equation numbering
-% is based on subeqn.sty by Stephen Gildea; most of the rest is based
-% on LaTeX's \eqnarray by Leslie Lamport and the LaTeX3 team.
-%
-% This provides a LaTeX environment {numcases} to produce multi-case
-% equations with a separate equation number for each case. There is
-% also {subnumcases} which numbers each case with the overall equation
-% number plus a letter [8a, 8b, etc.]. The syntax is
-%
-% \begin{numcases}{left_side}
-% case_1 & explanation_1 \\
-% case_2 & explanation_2 \\
-% ...
-% case_n & explanation_n
-% \end{numcases}
-%
-% Each case is a math formula, and each explanation is a piece of lr mode
-% text (which may contain math mode in \(...\) or $...$). The explanations
-% are optional. Equation numbers are inserted automatically, just as for
-% the eqnarray environment. In particular, the \nonumber command suppresses
-% an equation number and the \label command allows reference to a particular
-% case. In a subnumcases environment, a \label in the left_side of the
-% equation gives the overall equation number, without any letter.
-%
-% To use this package,
-% include "\usepackage{cases}" after \documentclass. You may also
-% specify "\usepackage[subnum]{cases}" to force *all* numcases
-% environments to be treated as subnumcases.
-%
-% Question: Is there a {numcases*} environment for unnumbered cases?
-% Answer: There is a {cases} environment in AMS-LaTeX, but it is just as
-% convenient to stick with the canonical LaTeX array:
-% \[ left side = \left\{ \begin{array}...\end{array} \right. \]
-%
-% Speaking of AMS-math, they use an entirely different system of equation
-% numbering, and this package uses ordinary LaTeX numbering.
-%
-% - - - - -
-% A simple example is:
-% \begin{numcases}{|x|=}
-% x, & for $x \geq 0$\\
-% -x, & for $x < 0$
-% \end{numcases}
-%
-% Giving:
-% / x for x > 0 (1)
-% |x| = < -
-% \ -x for x < 0 (2)
-%
-% - - - - -
-%
-% Another example is calculating the square root of $c+id$. First compute
-% \begin{subnumcases}{\label{w} w\equiv}
-% 0 & $c = d = 0$\label{wzero}\\
-% \sqrt{|c|}\,\sqrt{\frac{1 + \sqrt{1+(d/c)^2}}{2}} & $|c| \geq |d|$ \\
-% \sqrt{|d|}\,\sqrt{\frac{|c/d| + \sqrt{1+(c/d)^2}}{2}} & $|c| < |d|$
-% \end{subnumcases}
-% Then, using $w$ from eq.~(\ref{w}), the square root is
-% \begin{subnumcases}{\sqrt{c+id}=}
-% 0 & $w=0$ (case \ref{wzero})\\
-% w+i\frac{d}{2w} & $w \neq 0$, $c \geq 0$ \\
-% \frac{|d|}{2w} + iw & $w \neq 0$, $c < 0$, $d \geq 0$ \\
-% \frac{|d|}{2w} - iw & $w \neq 0$, $c < 0$, $d < 0$
-% \end{subnumcases}
-%
-% - - - begin definitions - - -
-
-\ProvidesPackage{cases}[2002/05/02 ver 2.5 ]
-
-\newenvironment{numcases}[1]%
-{$$\numc@opts \setbox\z@\hbox
- {\advance\c@equation\@ne\def\@currentlabel{\p@equation\theequation}% local
- $\displaystyle {#1\null}\m@th$}%
- \numc@setsub
- \setbox\tw@\vbox\bgroup
- \stepcounter{equation}\def\@currentlabel{\p@equation\theequation}%
- \global\@eqnswtrue\m@th \everycr{}\tabskip\numc@left\let\\\@eqncr
- \halign to\dimen@ii \bgroup \kern\wd\z@ \kern14\p@ % assume width of brace
- \tabskip\z@skip \global\@eqcnt\@ne $\displaystyle{##}$\hfil
- &\global\@eqcnt\tw@ \skip@10\p@ \advance\skip@\tw@\arraycolsep \hskip\skip@
- ##\unskip\hfil\tabskip\@centering% \unskip removes space if no explanations
- &\global\@eqcnt\thr@@\hbox to\z@\bgroup\hss##\egroup\tabskip\z@skip\cr
-}{\@@eqncr \egroup % end \halign, which does not contain first column or brace
- \global\advance\c@equation\m@ne
-%Measure the natural width of the alignment
- \unskip\unpenalty\unskip\unpenalty \setbox\z@\lastbox % grab last line
- \nointerlineskip \copy\z@ % then put it back
- \global\dimen@i\wd\z@
- \setbox\z@\hbox{\hskip-\numc@left\unhbox\z@}% Measure its natural width
- \ifdim \wd\z@<\dimen@i \global\dimen@i\wd\z@ \fi
-\egroup% end \vbox (box\tw@, box\z@ is restored to LHS)
-\hbox to\dimen@ii{\m@th % assemble the whole equation
- \hskip\numc@left
- \hbox to\dimen@i{$\displaystyle \box\z@ % parameter #1
- \dimen@\ht\tw@ \advance\dimen@\dp\tw@ % get size of brace
- \left\{\vcenter to\dimen@{\vfil}\right.\n@space % make brace
- $\hfil}\hskip\@centering % finished first part (filled whole line)
- \kern-\dimen@ii % backspace the full width
- $\vcenter{\box\tw@}$% overlay the alignment
- }% end the \hbox to\dimen@ii
-\numc@resetsub
-$$\global\@ignoretrue}
-
-\let\numc@setsub\relax
-\let\numc@resetsub\relax
-
-\def\subnumcases{\let\numc@setsub\subequations
- \let\numc@resetsub\endsubequations \numcases}
-\let\endsubnumcases\endnumcases
-
-% declare subequations -- either defining them following the style of
-% Gildea's subeqn.sty, or using the syntax of AMS-LaTeX if that is loaded.
-
-\@ifundefined{c@parentequation}{% No AMS, define subequations from scratch:
-%
-% These versions of subequations follow the style of Gildea's subeqn.sty,
-% but are thoroughly rewritten.
-%
-% You can change the labelling by redefining \thesubequation, but the names
-% of the counters may be confusing: The sub-number is given by counter
-% {equation}, while the overall equation number is given by {mainequation}.
-% There are two ways to reference the overall equation number:
-% through the value of \c@mainequation, as in \Roman{mainequation}, or
-% through \themainequation, which gives the text of the normal \theequation.
-% Refer to the local sub-number with \c@equation, as in \alph{equation}.
-% The default numbering is like 13c, given by:
-%
-\def\thesubequation{\themainequation\alph{equation}}
-%
-% Some alternatives:
-% \def\thesubequation{\themainequation.\Alph{equation}} % 13.C
-% \def\thesubequation{\themainequation-\roman{equation}} % 13-iii
-% \def\thesubequation{(\arabic{mainequation}\alph{equation})} % (13c)
-% The third alternative should be used if a document style has
-% declared \renewcommand{\@eqnnum}{\theequation} and
-% \renewcommand{\theequation}{(\arabic{equation})}, which makes
-% \ref put parentheses around regular equation numbers automatically.
-%
-\def\subequations{\refstepcounter{equation}%
- \mathchardef\c@mainequation\c@equation
- \let\@tempa\protect % * added protection
- \def\protect{\noexpand\protect\noexpand}% *
- \edef\themainequation{\theequation}\let\theequation\thesubequation
- \let\protect\@tempa % *
- \global\c@equation\z@}
-%
-\def\endsubequations{%
- \global\c@equation\c@mainequation
- \global\@ignoretrue}
-%
-% \begin{subeqnarray} works like \begin{subequations}\begin{eqnarray},
-% with the added feature that a \label command given given at the very
-% beginning of the first entry defines a label for the overall equation
-% number.
-%
-\def\subeqnarray{\subequations\eqnarray\@ifnextchar\label{\@lab@subeqnarray}{}}
-\def\endsubeqnarray{\endeqnarray\endsubequations}
-\def\@lab@subeqnarray#1#2{\begingroup
- \let\@currentlabel\themainequation #1{#2}\endgroup}
-%
-}{}% AMS \subequations already defined
-
-\def\numc@left{\@centering}
-\def\numc@opts{\dimen@ii\displaywidth}
-
-\DeclareOption{subnum}{
- \let\numc@setsub\subequations
- \let\numc@resetsub\endsubequations }
-
-\DeclareOption{fleqn}{
- \def\numc@left{\mathindent}
- \def\numc@opts{\displaywidth\linewidth
- \dimen@ii\linewidth }
-}
-\ProcessOptions
-
-\endinput
-
-% Send problem reports to asnd@triumf.ca
-
-Test file integrity: ASCII 32-57, 58-126: !"#$%&'()*+,-./0123456789
-:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~