tikz 交换图中的方程

Question

这个问题有很好的答案，如下：

交换图中的方程标签

再次感谢大家。

但是文本对变化非常敏感，所以当我尝试改变人们的建议时，我会收到错误消息。

因此我创建了最小的 MWE：

\documentclass{article}
\usepackage{amsmath}
\usepackage{tikz}

\usepackage{hyperref, longtable, tabu, booktabs}
\usetikzlibrary{arrows.meta,shapes.arrows}

\usepackage{tikz-cd}


\begin{document}


    \begin{figure}[h]
        \begin{equation*} \label{eqn-commutative}
        \begin{tikzcd}[row sep=huge, column sep=width("bbbbbbbbbbbbbbbbbbbbbbb")]  
        A    \arrow[r,  "\qquad \qquad \qquad \quad  \mathrm{some \; text \; here} \hspace{3cm}"]  
        \arrow[d,   "\mathrm{some \, down \, text \, here}"  swap]  &     \arrow[d,  "\mathrm{some \, down \, text \, here}" ] B  \\

        C        & D    \arrow[l, "\qquad \qquad \qquad \quad  \mathrm{some \; text \; here} \hspace{3cm}" ] \\

        \end{tikzcd} 
        \end{equation*} 
        \vspace{-1.5cm} 
        \caption{Figure caption here}  
        \label{figure-commutative} 
    \end{figure}

In place of the "A" I would like the following: 

\begin{equation} \label{eq:1} 
\left\{\begin{array}{rl}
\sup & c^T x  \\
s.t.   & Ax \leq b.
\end{array} \right. 
\end{equation} 

with equation label adjusted to left.

In place of the "B" I would like the following:

\begin{equation} \label{eq:2} 
\left\{\begin{array}{rl}
\sup & f^T x  \\
s.t.   & Dx \leq e.
\end{array} \right. 
\end{equation} 

with equation label adjusted to left.

Then I would like to reference \eqref{eq:1} and \eqref{eq:2} here. 

\end{document}

Answer 1

我会为此定义一个合适的命令。请注意，您不必猜测单个大块的宽度。

\documentclass{article}
\usepackage{amsmath}
\usepackage{tikz-cd}

\makeatletter
\newcommand{\nodeequation}[1]{%
  \let\label\ltx@label
  \refstepcounter{equation}%
  (\theequation)%
  \quad#1%
}
\makeatother

\begin{document}
\begin{equation*}
\begin{tikzcd}[row sep=4em,column sep=10em,ampersand replacement=\&]
  \nodeequation{
    \label{eq:1}
    \begin{cases}
    \begin{alignedat}{2}
    &\sup          &\quad& c^T x  \\
    &\,\text{s.t.} &\quad& Ax \leq b.
    \end{alignedat}
    \end{cases}
  } 
  \arrow[r,"\text{some text here}"] \arrow[d,swap,"\text{some text here}"] \&
  \nodeequation{
    \label{eq:2}
    \begin{cases}
    \begin{alignedat}{2}
    &\sup          &\quad& f^T x  \\
    &\,\text{s.t.} &\quad& Dx \leq c.
    \end{alignedat}
    \end{cases}
  } 
  \arrow[d,"\text{some text here}"]
\\
  C \& D \arrow[l,"\text{some text here}"]
\end{tikzcd}
\end{equation*}
The references are \eqref{eq:1} and \eqref{eq:2}. Another equation to see
that the number is right
\begin{equation}
0=0
\end{equation}

\end{document}

Answer 2

这是一个建议。左边和右边的方程数字回到大卫·卡莱尔的回答。因此，只需将这些方程式压缩到小页面中即可。并且，无需使用\quad和\hspace集合，只需使用pos=...以移动文本即可，顺便说\text一句，使用它们排版要简单得多。

\documentclass{article}
\usepackage{amsmath}
\usepackage{tikz-cd}
\usepackage{hyperref}

% https://tex.stackexchange.com/a/212099/121799
\makeatletter
\newcommand{\leqnomode}{\tagsleft@true\let\veqno\@@leqno}%
\newcommand{\reqnomode}{\tagsleft@false\let\veqno\@@eqno}%
\newcommand*{\compress}{\@minipagetrue}
\makeatother

\begin{document}


\begin{figure}[h]
\begin{equation*}
\begin{tikzcd}[row sep=huge, column sep=width("bbbbbbbbbbbbbbbbbbbbbbb"),
ampersand replacement=\&]  
\begin{minipage}{4cm}
\leqnomode
\begin{equation} \label{eq:1} 
\left\{\begin{array}{rl}
\sup & c^T x  \\
s.t.   & Ax \leq b.
\end{array} \right. 
\end{equation} 
\end{minipage}
   \arrow[r,  "\text{some text here}" pos=0.5]  
        \arrow[d,   "\text{some down text here}"  swap]  \&     
        \arrow[d,  "\text{some down text here}" ] 
\begin{minipage}{4cm}
\begin{equation} \label{eq:2} 
\left\{\begin{array}{rl}
\sup & f^T x  \\
s.t.   & Dx \leq e.
\end{array} \right. 
\end{equation} 
\end{minipage}\\
        C        \& D    
        \arrow[l, "\text{some text here}" pos=0.4 ] \\[-1cm]
\end{tikzcd} 
\end{equation*}
\caption{Figure caption here.}  
\label{figure-commutative} 
\end{figure}

Then I would like to reference \eqref{eq:1} and \eqref{eq:2} here. 

\end{document}