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如何绘制这种流程图

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如何绘制这种流程图

我想要绘制这个图：

在此处输入图片描述

我有以下 MWE（不完整）：

\sf
    \begin{tikzpicture}[node distance=2cm, on grid]
        \tikzset{
            mynode/.style={circle, draw,minimum width=8mm,inner sep=0pt},
            myarrow/.style={-{Stealth[scale=1.5]}}
            }
        \node (1) {};
        \node [mynode,right=of 1] (A1) {S};
        \node [mynode,right=of A1] (B1) {I};
        \draw [myarrow, right=of 1] (1)--(A1)  node[midway,above] {$\mu$};
        
        \draw [myarrow] (A1) -- (B1) node[midway,above] {$\beta$};
\end{tikzpicture}

答案1

如果你想让箭头从任何地方开始或结束，则不需要节点或坐标。例如，

\draw[<-] (A) -- ++(-1,0);

将从 左侧开始绘制一个箭头(A)，指向(A)。同样，

\draw[->] (A) -- ++(0,-1);

绘制一个从 开始(A)并指向下方的箭头。

在此处输入图片描述

\documentclass[border=5pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{positioning,arrows.meta}
\begin{document}
\begin{tikzpicture}[node distance=2cm, on grid]
  \tikzset{
    mynode/.style = {circle,draw,minimum width=8mm,inner sep=0pt},
    > = {Stealth[scale=1.5]}
  }
  \node [mynode] (A1) {S};
  \node [mynode,right=of A1] (B1) {I};
  \node [mynode,right=of B1] (C1) {R};
  \draw [<-] (A1) -- ++(-1,0) node[left] {$\mu$};
  \draw [->] (A1) -- node[above] {$\beta$} (B1);
  \draw [->] (B1) -- node[above] {$\gamma$} (C1);
  \draw [->] (A1) -- ++(0,-1) node[below] {$\nu$S};
  \draw [->] (B1) -- ++(0,-1) node[below] {$\nu$I};
  \draw [->] (C1) -- ++(0,-1) node[below] {$\nu$R};
  \draw [->] (C1) to[out=135,in=45] node[above] {$\epsilon$} (A1);
\end{tikzpicture}
\end{document}

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