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rcl 列对齐，无多余空格，每行有 \tag{}

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rcl 列对齐，无多余空格，每行有 \tag{}

我正在寻找一种方法，将一些文本对齐到右边缘（就像这样\tag*{…}做）放在方程式每行的末尾。该方程式有多列，我需要控制每列的​​对齐方式（右对齐、居中对齐或左对齐）。此外，我不希望环境在第一列之前、最后一列之后或列之间添加额外的空间。

我尝试了以下方法，但不起作用，因为\tag{…}整个等式只允许一个。

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\[
\begin{array}{@{}r@{}c@{}l@{}}
  a&bbbbb&c \tag*{a, b and c} \\
  x&y&z    \tag*{other stuff}\\
\end{array}
\]
\end{document}

期望结果的屏幕截图。

cases如果我也可以对子句（大括号后的行）执行此操作，那就太酷了，就像numcases这样做（但numcases不支持\tag，并且在各处添加额外的空格）。

我尝试过的事情（浏览了这里不少问题之后）：

  • equationarray从eqnarray包看起来很有希望，但它不支持\tag{…}命令，只有\notag（我试过，但未能手动调用内部函数\tag{…}）。在命令align之间添加额外的空间
  • align并且empheq不支持rcl列规范和添加额外空间
  • alignat*除列规范外，所有内容rcl（硬编码为rlrlrl…）

现在我最好的选择是放一个标记并将标签绘制为覆盖层（我对精确/参考tikz不是特别感兴趣，如果需要，我可以让所有标签指向整个多线方程，因此绘制是一个粗略但可行的解决方案）。\label\reftikz

答案1

你可以滥用IEEEtrantools（但我建议不要将属于等式的材料推到右边距，右边距应该保留用于参考标记或数字）。

请注意，您有责任避免重叠。

\documentclass{article}
\usepackage{amsmath}
\usepackage{IEEEtrantools}
\usepackage{showframe}

\begin{document}

\begin{IEEEeqnarray*}{r-c-l+r-}
a&bbbbb&c &\makebox[0pt][r]{a, b and c} \\
x&y&z     &\makebox[0pt][r]{other stuff}
\end{IEEEeqnarray*}

\begin{equation}
abbbbbc
\end{equation}

\end{document}

在此处输入图片描述

原答案供参考

\documentclass{article}
\usepackage{amsmath}
\usepackage{IEEEtrantools}

\renewcommand\theIEEEsubequationdis{\theIEEEsubequation}
\newcommand{\IEEEtag}[1]{%
  \IEEEyessubnumber
  \gdef\theIEEEsubequation{#1}%
}

\begin{document}

\begin{IEEEeqnarray}{r-c-l}
a&bbbbb&c \IEEEtag{a, b and c} \\
x&y&z     \IEEEtag{other stuff}
\end{IEEEeqnarray}

\begin{equation} % just for checking the number has not advanced
a
\end{equation}

\end{document}

在此处输入图片描述

答案2

给你，有alignat和eqparbox：

\documentclass{article}
\usepackage{amsmath}
\usepackage{eqparbox}
\newcommand{\eqmathbox}[2][M]{\eqmakebox[#1]{$\displaystyle#2$}}

\begin{document}

\begin{alignat}{3}\label{rcl-eq}
  aa & & \eqmathbox{bbbbb} & & & c \tag*{a, b and c} \\
  x & &\eqmathbox{ y} & & & zzz \tag*{other stuff}
\end{alignat}

\end{document}

在此处输入图片描述

答案3

比rl对并没有深深嵌入 amsmath 代码中，因此很容易使用alignat（或任何 AMS 比对）不同的设置。这里我提供了一个命令，让你指定一个字符串，例如，clr它将根据需要重复多次，就像标准rl

在此处输入图片描述

\documentclass{article}

\usepackage{amsmath}
\makeatletter
\def\align@preamble@r{%
\hfil
    \strut@
    \setboxz@h{\@lign$\m@th\displaystyle{##}$}%
    \ifmeasuring@\savefieldlength@\fi
    \set@field
    \tabskip\z@skip}
\def\align@preamble@l{%
\strut@
\setboxz@h{\@lign$\m@th\displaystyle{{}##}$}%
    \ifmeasuring@\savefieldlength@\fi
    \set@field
    \hfil
    \tabskip\alignsep@}
\def\align@preamble@c{%
\hfil
    \strut@
\setboxz@h{\@lign$\m@th\displaystyle{{}##}$}%
    \ifmeasuring@\savefieldlength@\fi
    \set@field
    \hfil
    \tabskip\alignsep@
}


\def\setalignpreamble#1{\def\align@preamble{}\x@setalignpreamble#1\relax}
\def\x@setalignpreamble#1{%
\ifx\relax#1\else
\edef\align@preamble{%
\unexpanded\expandafter{\align@preamble}%
&\span\expandafter\noexpand\csname align@preamble@#1\endcsname}%
\expandafter\x@setalignpreamble
\fi}



\begin{document}

default (rl)
\begin{alignat}{2}
  a&b&c&d\\
www& xxx&yyy&zzz
\end{alignat}

rl \setalignpreamble{rl}
\begin{alignat}{2}
  a &b&c&d\\
www& xxx&yyy&zzz
\end{alignat}

c \setalignpreamble{c}
\begin{alignat}{2}
  a &b&c&d\\
www& xxx&yyy&zzz
\end{alignat}


ccrr \setalignpreamble{ccrr}
\begin{alignat}{2}
  a &b&c&d\\
www& xxx&yyy&zzz
\end{alignat}

lcrc \setalignpreamble{lcrc}
\begin{alignat}{2}
  a &b&c&d\\
www& xxx&yyy&zzz
\end{alignat}

\end{document}

答案4

这是一个使用 TikZ 和overlay,remember picture的比较全面的实现\tikztag{text}。

带星号的版本\tikztag*{text}省略了 周围的括号text。当给出单个可选参数时，它会给出标签的名称，例如\tikztag[eq:foo]{Foo}将放置一个标签，例如\ref{eq:foo}使用 用作Foo“ref”文本。当给出第二个可选参数时，它会选择“ref”的文本，例如\tikztag*[eq:foo][Short]{Blah blah (Short)}将引用方程式，但会在方程式的右侧Short包含更多内容。Blah Blah

当 hyperref 加载时，引用\ref{…}指向正确的子方程。

要使用它，只需复制序言中\makeatletter和之间的所有内容\makeatother（或在 中.sty，删除\makeatletter和\makeatother行）。然后，使用\begin{taggableequationstar}…\end{{taggableequationstar}代替\begin{equation*}…\end{equation*}包含 使用的方程式\tikztag。

生成的文档的屏幕截图。

% This code is released under the CC0 license (i.e. in the Public Domain
% or under a very permissive license if your country does not recognise
% dedications to the Public Domain.
\documentclass{article}
\makeatletter
\usepackage{amsmath, tikz, array, hyperref, lipsum}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Parse options into:
%    \if@tikztag@star
%    \if@tikztag@label@
%    \@tikztag@label
%    \if@tikztag@labeltext@
%    \@tikztag@label
\newif\if@tikztag@star@
\newif\if@tikztag@label@
\newif\if@tikztag@labeltext@
\def\tikztag{\@ifstar\@tikztag@star\@tikztag@nostar}
\def\@tikztag@star{\@tikztag@star@true\expandafter\@tikztag@common}
\def\@tikztag@nostar{\@tikztag@star@false\expandafter\@tikztag@common}
\def\@tikztag@common{\@ifnextchar[{%
    \@tikztag@label@true\@tikztag@get@label%
  }{%
    \@tikztag@label@false\@tikztag%
  }}
\def\@tikztag@get@label[#1]{\def\@tikztag@label{#1}\expandafter\@tikztag@get@maybe@labeltext}
\def\@tikztag@get@maybe@labeltext{\@ifnextchar[{%
    \@tikztag@labeltext@true\@tikztag@get@labeltext%
  }{%
    \@tikztag@labeltext@false\@tikztag%
  }}
\def\@tikztag@get@labeltext[#1]{\def\@tikztag@labeltext{#1}\expandafter\@tikztag}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Implementation:
\edef\tikztagnumber{0}
\newcommand{\@tikztag}[1]{%
  % place the marker:
  \pgfmathtruncatemacro{\tikztagnumber}{\tikztagnumber+1}%
  \xdef\tikztagnumber{\tikztagnumber}%
  \tikz[remember picture]\coordinate(tikztagmarker\tikztagnumber){};%
  % dispatch given the options
  \expandafter\gdef\csname @tikztag@tag@\tikztagnumber\endcsname{#1}%
  \if@tikztag@label@%
    \if@tikztag@labeltext@%
      \if@tikztag@star@%
        \edef\@@tikztag{\noexpand\@@@tikztag{\expandafter\noexpand\@tikztag@label}{\expandafter\noexpand\@tikztag@labeltext}{\expandafter\noexpand\csname @tikztag@tag@\tikztagnumber\endcsname}{\tikztagnumber}{\noexpand\@firstoftwo}}%
      \else%
        \edef\@@tikztag{\noexpand\@@@tikztag{\expandafter\noexpand\@tikztag@label}{\expandafter\noexpand\@tikztag@labeltext}{(\expandafter\noexpand\csname @tikztag@tag@\tikztagnumber\endcsname)}{\tikztagnumber}{\noexpand\@firstoftwo}}%
      \fi%
    \else%
      \if@tikztag@star@%
        \edef\@@tikztag{\noexpand\@@@tikztag{\expandafter\noexpand\@tikztag@label}{\expandafter\noexpand\csname @tikztag@tag@\tikztagnumber\endcsname}{\expandafter\noexpand\csname @tikztag@tag@\tikztagnumber\endcsname}{\tikztagnumber}{\noexpand\@firstoftwo}}%
      \else%
        \edef\@@tikztag{\noexpand\@@@tikztag{\expandafter\noexpand\@tikztag@label}{\expandafter\noexpand\csname @tikztag@tag@\tikztagnumber\endcsname}{(\expandafter\noexpand\csname @tikztag@tag@\tikztagnumber\endcsname)}{\tikztagnumber}{\noexpand\@firstoftwo}}%
      \fi%
    \fi%
  \else%
    \if@tikztag@star@%
      \edef\@@tikztag{\noexpand\@@@tikztag{no label}{no label text}{\expandafter\noexpand\csname @tikztag@tag@\tikztagnumber\endcsname}{\tikztagnumber}{\noexpand\@secondoftwo}}%
      \else%
      \edef\@@tikztag{\noexpand\@@@tikztag{no label}{no label text}{(\expandafter\noexpand\csname @tikztag@tag@\tikztagnumber\endcsname)}{\tikztagnumber}{\noexpand\@secondoftwo}}%
    \fi%
  \fi%
  \@@tikztag%
}
\newcommand{\@@@tikztag}[5]{%
  \g@addto@macro\accumulatetikztag{\@@@@tikztag{#1}{#2}{#3}{#4}{#5}}%
}
% #1=label #2=label text #3=text #4=\tikztagnumber #5=\@firstoftwo or \@secondoftwo to use label or not
\newcommand{\@@@@tikztag}[5]{%
  \tikz[overlay,remember picture]%
    \node[anchor=base east, inner xsep=0pt]%
      at (tikztagmarker#4 -| current line right)%
      {#3};%
  #5{%
    \tikz[overlay,remember picture]%
      \node[anchor=base east, inner xsep=0pt]%
        at (tikztagmarker#4 -| current line left)%
        {\phantomsection\edef\@currentlabel{#2}\label{#1}};%
  }{}
}
\newenvironment{taggableequationstar}{%
  \noindent\tikz[remember picture]\coordinate(current line left){};%
  \tikz[overlay,remember picture]%
    \coordinate[xshift=\linewidth] (current line right) at (current line left){};%
  \xdef\accumulatetikztag{}%
  \begin{equation*}%
}{%
  \end{equation*}%
  \accumulatetikztag
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\makeatother
\begin{document}

\newcolumntype{R}{>{\displaystyle}r}
\newcolumntype{C}{>{\displaystyle}c}
\newcolumntype{L}{>{\displaystyle}l}

\lipsum[2]
\begin{equation*}
  \begin{array}{@{}R@{}C@{}L@{}}
    a&bbbbb&c  \\
    x&y&z      \\
  \end{array}
\end{equation*}
\lipsum[2]
\begin{taggableequationstar}
  \begin{array}{@{}R@{}C@{}L@{}}
    a&bbbbb&c \tikztag[eq:foo][abc]{a, b and c} \\
    x&y&z     \tikztag[eq:bar]{other stuff}\\
    x&y&z     \tikztag{more stuff}\\
  \end{array}
\end{taggableequationstar}
Foo: \ref{eq:foo}. Bar: \ref{eq:bar}. Baz: \ref{eq:baz}. Quux: \ref{eq:quux}.
\lipsum[2]
\begin{taggableequationstar}
  \begin{array}{@{}R@{}C@{}L@{}}
    \frac{a}{i}&bbbbb&c \tikztag*[eq:baz][baz]{a, b and c (baz)} \\
    x&y&z     \tikztag*[eq:quux]{other stuff 2}\\
    x&y&z     \tikztag*{more stuff 2}\\
  \end{array}
\end{taggableequationstar}

\end{document}

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