☰

可扩展的非成对分隔符

tag-icon • tag-icon delimiters mathtools
可扩展的非成对分隔符

是否有适用于mathtools的变体\DeclarePairedDelimiter未配对分隔符？编辑：明确地说，我正在寻找一个可以调用为\command{delimited}、\command*{delimited}或 的命令\command[\big]{delimited}，语法为DeclarePairedDelimiter。

\usepackage{article}
\usepackage{mathtools}
\newcommand\tall{\rule{0pt}{10ex}}
\DeclarePairedDelimiter\withblank{}\rvert
\DeclarePairedDelimiter\withdot.\rvert
\DeclarePairedDelimiter\withrelax\relax\rvert
\begin{document}
\(\withdot*\tall\) produces the same result as \(\left.\tall\right\rvert\), but \(\withdot{}\) does not produce the same result as \({}\rvert\).

\(\withblank{}\) and \(\withrelax{}\) produce the same result as \({}\rvert\), and \(\withblank*\tall\) and \(\withrelax*\tall\) both give errors (but eventually produce the same result as \(\left.\tall\right\rvert\)).
\end{document}

编辑：明确地说，正如@Werner 指出的那样以下，的行为\withdot{}实际上不是一个错误；它只是不是我想要的。

答案1

\withblank和(非星号)都\withrelax无法工作，因为没有 (比如说) 可扩展的{}。唯一可扩展的“空白”分隔符是.。如果您有兴趣定义可能以类似于 提供的星号形式使用的空白左/右分隔符\DeclarePairedDelimiter，则以下内容可能足够：

在此处输入图片描述

\documentclass{article}

\usepackage{mathtools}

% http://tex.stackexchange.com/a/42337/5764
\begingroup\lccode`\|=`\\
\lowercase{\endgroup\def\removebs#1{\if#1|\else#1\fi}}
\newcommand{\macroname}[1]{\expandafter\removebs\string#1}

\newcommand\tall{\rule{0pt}{10ex}}

\DeclarePairedDelimiter\withdot.\rvert

\makeatletter
\newcommand{\withblank}{\@ifstar\withblank@\withblank@@}
\newcommand{\withblank@}[1]{\left.\kern-\nulldelimiterspace #1\right\rvert}% \withblank*{..}
\newcommand{\withblank@@}[2][]{% \withblank[.]{..}
  #2
  \if\relax#1\relax
    \rvert
  \else
    \csname\macroname{#1}r\endcsname\rvert
  \fi}
\newcommand{\withrelax}{\withblank}% \withrelax is similar to \withblank
\makeatother

\begin{document}

\(\withdot*\tall\) produces the same result as \(\left.\tall\right\rvert\).

\(\withdot{}\) produce the same result as \(.{}\rvert\).

\(\withblank{}\) and \(\withrelax{}\) is similar to \({}\rvert\).

\(\withblank[\Big]{}\) and \(\withrelax[\Big]{}\) is similar to \({}\Bigr\rvert\).

\(\withblank*\tall\) and \(\withrelax*\tall\) is similar to \(\left.\kern-\nulldelimiterspace\tall\right\rvert\).

\end{document}

请注意定义

\DeclarePairedDelimiter\withdot.\rvert

很奇怪，就像\withdot{<stuff>}提供的一样.<stuff>\rvert，并且不清楚.这里的分隔符（未扩展）是什么意思。

相关内容