Latex --- 有没有办法将方程式编号为一个制表符的空格从右边距移动（向左移动）？

Question

我一直在格式化我的论文，但一个小问题困扰着我。 我使用以下代码来排版方程

\begin{align}
& R=\frac{P^2}{P+S'} \label{eqn:SCS}\\
&\mbox {where} \quad \mbox R = \mbox {Watershed Runoff} \notag\\
&\hspace{0.63in} \mbox P = \mbox{Rainfall} \notag\\
&\hspace{0.63in} \mbox S' = \mbox{Storage in the watershed $=\frac{1000}{CN}-10$ }\notag
\end{align}

我的输出要求是这样的： 方程应从左边距开始一个制表符空间 方程编号应以距离右边距一个制表符空格结束。

使用上面的代码，我让方程从正确的位置开始，但没有编号。

任何帮助将不胜感激。

谢谢 国会议员

Answer 1

我能做到的最好的。请注意 fleqn 选项和 minipage 环境。如果您始终需要此功能，则必须相应地重新定义 align 环境。

\usepackage{amsmath}
\begin{document}

Lorem Ipsum is simply dummy text of the printing and typesetting
industry. 

\begin{minipage}{0.8\textwidth}
\begin{align}
& R=\frac{P^2}{P+S'} \label{eqn:SCS}\\
&\mbox {where} \quad \mbox R = \mbox {Watershed Runoff} \notag\\
&\hspace{0.63in} \mbox P = \mbox{Rainfall} \notag\\
&\hspace{0.63in} \mbox S' = \mbox{Storage in the watershed $=\frac{1000}{CN}-10$ }\notag
\end{align}
\end{minipage}

Lorem Ipsum is simply dummy text of the printing and typesetting
industry. 
\end{document}

编辑

更优雅和对称的版本：

\documentclass[fleqn]{article}
\usepackage{amsmath}
\makeatletter
\setlength\@mathmargin{0pt}
\makeatother

\begin{document}
\noindent Lorem Ipsum is simply dummy text of the printing and
typesetting
industry. The margins of the quotation environment are indented on the
left and the right. The text is justified at both margins and there is
paragraph indentation. Leaving a blank line between text produces a
new paragraph. 
\begin{quotation}
\begin{align}
& R=\frac{P^2}{P+S'} \label{eqn:SCS}\\
&\mbox {where} \quad \mbox R = \mbox {Watershed Runoff} \notag\\
&\hspace{0.63in} \mbox P = \mbox{Rainfall} \notag\\
&\hspace{0.63in} \mbox S' = \mbox{Storage in the watershed $=\frac{1000}{CN}-10$ }\notag
\end{align}
\end{quotation}
Lorem Ipsum is simply dummy text of the printing and typesetting
industry. The margins of the quotation environment are indented on the
left and the right. The text is justified at both margins and there is
paragraph indentation. Leaving a blank line between text produces a
new paragraph. 
\end{document}

Answer 2

没关系，我一直在使用 \setlength{\mathindent}{0.5in} 这使得我的方程从左边距 1in 开始。我将代码修改如下，就像这样工作！！！！甜蜜...

\begin{minipage}{5.5in} 
\setlength{\mathindent}{0.0in}
\begin{align} 
& R=\frac{P^2}{P+S'} \label{eqn:SCS}\\ 
&\mbox {where} \quad \mbox R = \mbox {Watershed Runoff} \notag\\ 
&\hspace{0.63in} \mbox P = \mbox{Rainfall} \notag\\ 
&\hspace{0.63in} \mbox S' = \mbox{Storage in the watershed $=\frac{1000}{CN}-10$ }\notag 
\end{align} 
\end{minipage} 

你让我很开心！！！！

Answer 3

\hspace{.63in} brrrrr...

以下代码解决了您的问题。

\newskip \tabspace \tabspace = 3em % Set tab space
\def\eq{\refstepcounter{equation}(\theequation)}% To insert the next number
{
\let\\\cr \tabskip 0pt
\halign to \hsize{\hskip\tabspace$\displaystyle#$\hfil&#\hfil
   \tabskip 0pt plus 1fil &\hfil#\hskip\tabspace\tabskip 0pt\crcr
%%%% Your code %%%%
R=\frac{P^2}{P+S'}\span\omit&\eq\cr
\hbox{where }&$R$  = Watershed Runoff\cr
             &$P$  = Rainfall\cr
             &$S'$ = Storage in the watershed $=\frac{1000}{CN}-10$\cr
%%%%           %%%%
}
}