amsmath：我如何在任何地方手动使用方程编号和标签？

Question

我想在任何地方手动使用习惯的方程编号和标签；例如在数组中。

使用该命令
\newcommand{\tagx}[1][]{\refstepcounter{equation}(\theequation)\label{#1}}
我可以创建自定义标签\tagx或\tagx[eq:bar]并像往常一样引用它们\eqref{eq:bar}。

但是在具有自己的图形的标签中
\newcommand\mytag[2][]{\begingroup \renewcommand{\theequation}{#2}% ändern (\theequation)\label{#1} % ausschreiben \endgroup }
仍然有效\mytag[eq:bar1]{***}，但不能引用\eqref{eq:bar1}。

我能做些什么？

\documentclass[12pt]{scrreprt}
\usepackage{amsmath, amsfonts, amssymb}

\newcommand{\tagx}[1][]{\refstepcounter{equation}(\theequation)\label{#1}}

\newcommand\mytag[2][]{\begingroup
\renewcommand{\theequation}{#2}% ändern
(\theequation)\label{#1} % ausschreiben
\endgroup
}

% \renewcommand{\theequation}{\refstepcounter{equation}(\theequation)}


\usepackage[colorlinks=true]{hyperref}
\begin{document}
\chapter{First Chapter}
An equation for counting: 
\begin{equation}
a+b=c\label{eq:foo1} 
\end{equation}
The tag of the equation is \eqref{eq:foo1}.

\section{Putting a tag in the text}
A normal tag in the text \tagx[eq:bar0] and an own tag \mytag[eq:bar1]{***} is showing correct. 

The referencing of the normal tag in the text \eqref{eq:bar0} is correct; but the own tag \eqref{eq:bar1} is wrong - here should be "(***)". 
\bigskip


Another equation:
\begin{equation}
1+1=2\label{eq:foo2} 
\end{equation}
The tag of the equation is \eqref{eq:foo2}.

\end{document}

Answer 1

您的\mytag命令未设置\@currentlabel。

\makeatletter
\newcommand\mytag[2][]{%
  \def\@currentlabel{#2}%
  (#2)\label{#1}% ausschreiben
}
\makeatother

我不确定为什么“标签”参数是可选的：你需要是吗？

\documentclass[12pt]{scrreprt}
\usepackage{amsmath, amsfonts, amssymb}
\usepackage[colorlinks=true]{hyperref}

\newcommand{\tagx}[1][]{\refstepcounter{equation}(\theequation)\label{#1}}

\makeatletter
\newcommand\mytag[2][]{%
  \def\@currentlabel{#2}%
  (#2)\label{#1} % ausschreiben
}
\makeatother

% \renewcommand{\theequation}{\refstepcounter{equation}(\theequation)}


\begin{document}
\chapter{First Chapter}
An equation for counting: 
\begin{equation}
a+b=c\label{eq:foo1} 
\end{equation}
The tag of the equation is \eqref{eq:foo1}.

\section{Putting a tag in the text}
A normal tag in the text \tagx[eq:bar0] and an own tag \mytag[eq:bar1]{***} is showing correct. 

The referencing of the normal tag in the text \eqref{eq:bar0} is correct; but the own tag \eqref{eq:bar1} is wrong - here should be "(***)". 
\bigskip


Another equation:
\begin{equation}
1+1=2\label{eq:foo2} 
\end{equation}
The tag of the equation is \eqref{eq:foo2}.

\end{document}

我会以不同的方式来实现它：标签应该是强制性的，而个人标签是可选的。

\documentclass[12pt]{scrreprt}
\usepackage{amsmath, amsfonts, amssymb, xparse}
\usepackage[colorlinks=true]{hyperref}

\makeatletter
\NewDocumentCommand{\tagx}{om}{%
  \IfNoValueTF{#1}
   {% normal equation number
    \refstepcounter{equation}(\theequation)\label{#2}%
   }
   {% personal tag
    (#1)\def\@currentlabel{#1}\label{#2}%
   }%
}
\makeatother

\begin{document}
\chapter{First Chapter}
An equation for counting: 
\begin{equation}
a+b=c\label{eq:foo1} 
\end{equation}
The tag of the equation is \eqref{eq:foo1}.

\section{Putting a tag in the text}
A normal tag in the text \tagx{eq:bar0} and an own 
tag \tagx[***]{eq:bar1} is showing correct. 

The referencing of the normal tag in the text \eqref{eq:bar0} 
is correct; the own tag \eqref{eq:bar1} is correct as well.

Another equation:
\begin{equation}
1+1=2\label{eq:foo2} 
\end{equation}
The tag of the equation is \eqref{eq:foo2}.

\end{document}

Answer 2

我想你想要类似的东西

\documentclass[12pt]{scrreprt}
\usepackage{amsmath, amsfonts, amssymb}

\newcommand{\tagx}[1]{\refstepcounter{equation}(\theequation)\label{#1}}

\makeatletter
\newcommand\mytag[2]{{%
#2%
\def\@currentlabel{#2}%
\label{#1}%
}}
\makeatother
% \renewcommand{\theequation}{\refstepcounter{equation}(\theequation)}


\usepackage[colorlinks=true]{hyperref}
\begin{document}
\chapter{First Chapter}
An equation for counting: 
\begin{equation}
a+b=c\label{eq:foo1} 
\end{equation}
The tag of the equation is \eqref{eq:foo1}.

\section{Putting a tag in the text}
A normal tag in the text \tagx{eq:bar0} and an own tag \mytag{eq:bar1}{***} is showing correct. 

The referencing of the normal tag in the text \eqref{eq:bar0} is correct; but the own tag \eqref{eq:bar1} is wrong - here should be "(***)". 
\bigskip


Another equation:
\begin{equation}
1+1=2\label{eq:foo2} 
\end{equation}
The tag of the equation is \eqref{eq:foo2}.

\end{document}