如何在乳胶中创建图表

Question

我想分别制作这两个图表。我尝试插入这两个图像，但它们看起来不太好看。我该如何自己创建它们。

我很感激任何帮助。提前致谢。

Answer 1

tikz-cd使用和很容易做到mathtools：

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

\begin{document}

\[ \begin{tikzcd}
0 \arrow[r] & \prescript{}{R}{A} \arrow[r, "\theta"] \arrow[d, "\phi", swap] & \prescript{}{R}{B}\arrow[dl, "\Psi"] \\%
 & \prescript{}{R}{X}
\end{tikzcd}
\]

\end{document} 

Answer 2

使用这种方法tikz将产生具有更多开放代码的相同图表：更容易注释掉、删除或编辑单独的行。

\documentclass[12pt,a4paper]{article}

\usepackage{tikz}
\usetikzlibrary{positioning}

\begin{document}
    
\begin{tikzpicture}[auto, node distance=1.0cm,
    block/.style={ minimum height=2em, minimum width=3em}
    ]   
    % upper figure nodes  
    \node[block]               (Zeup){0};
    \node[right=of Zeup, block](ARup){$A_R$};
    \node[right=of ARup, block](BRup){$B_R$};
    \node[below=of ARup, block](XRup){$X_R$};
    \node[right=of BRup, block](exup){exact}; 
    
    % lower figure nodes
    \node[below=of XRup, block](ARlo){$A_R$};
    \node[left= of ARlo, block](Zelo){0};
    \node[right=of ARlo, block](BRlo){$B_R$};
    \node[below=of ARlo, block](XRlo){$X_R$};
    \node[right=of BRlo, block](exlo){exact}; 
    
    % upper  arrows
    \draw[->] (Zeup) -- (ARup);
    \draw[->] (ARup) -- node[pos=0.5,above]{$\theta$}(BRup);
    \draw[->] (ARup) -- node[pos=0.5,left]{$\phi$} (XRup);
    
    % lower arrows
    \draw[->] (Zelo) -- (ARlo);
    \draw[->] (ARlo) -- node[pos=0.5,above]{$\theta$}(BRlo);
    \draw[->] (ARlo) -- node[pos=0.5,left]{$\phi$} (XRlo);
    \draw[->] (BRlo) -- node[pos=0.5,below,sloped]{$\Psi$} (XRlo);   
\end{tikzpicture}
    
\end{document}