TikZ-PGF – Creating a Figure in TikZ for 2 State Markov Models

tikz-arrowstikz-pgftikz-trees

I would like to make the following figure in Tikz:

I have tried using the code here, but I did not succeed unfortunately.

Can anyone provide me some code to make such a picture?

Thanks in advance.

Best Answer

One fairly simple-minded option:

\documentclass[tikz,border=10pt,multi]{standalone}
\usetikzlibrary{positioning,arrows.meta,,bending}
\begin{document}
  \begin{tikzpicture}
    [
      >/.tip={Triangle[length=7.5pt,width=5pt,bend]},
      line width=1pt,
      my circle/.style={minimum width=10mm, circle, draw},
      my label/.style={above=10pt, anchor=mid}
    ]
    \node (1) [my circle] {$1$};
    \node (2) [my circle, right=75pt of 1] {$2$};
    \path [postaction={draw, {>[sep=5pt,reversed]}-{<[sep=5pt]}}, draw] (1) -- (2) node [very near start, my label] {$\alpha$}  node [very near end, my label] {$\beta$} ;
    \path [->, draw] (2.south east) arc (-135:135:5mm) node [near end, my label] {$1-\beta$};
    \path [->, draw] (1.south west) arc (-45:-315:5mm) node [near end, my label] {$1-\alpha$};
  \end{tikzpicture}
\end{document}

Related Solutions

tikz-pgf – Drawing a Markov Chain Using Tikz

This is because you drew the circles which are not nodes, so TikZ doesn't know it has to start the arrows on their borders. You'd better give your nodes a minimum size and a shape (circle, here) and tell TikZ to draw them.

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{tikz}

\begin{document}

\begin{figure}
\begin{center}
\begin{tikzpicture}[mystate/.style={draw,circle,minimum size=1.2cm}]

%circle
%\draw [thick] (-3.5,-1.6) circle [radius=0.6];
%\draw [thick] (-0.9,-1.6) circle [radius=0.6];
%\draw [thick] (1.7,-1.6) circle [radius=0.6];
%\draw [thick] (6.8,-1.6) circle [radius=0.6];
%\draw [thick] (9.4,-1.6) circle [radius=0.6];

%label state
\node[mystate] (A) at (-3.5,-1.6) {1};
\node[mystate] (B) at (-0.9,-1.6) {2};
\node[mystate] (C) at (1.7,-1.6) {3};
\node[minimum size=1.2cm] (C')at (4.25,-1.6){};
\node[mystate] (D) at (6.8,-1.6) {$m$};
\node[mystate] (E) at (9.4,-1.6) {$m+1$};

%horizontal arrow
\draw [->, thick] (A) -- (B) node[midway, above] {\footnotesize $x^{(m)}$};
\draw [->, thick] (B) -- (C) node[midway, above] {\footnotesize $D^{(m)}$};
\draw [->, thick] (C) -- (C') node[midway, above] {\footnotesize $D^{(m-1)}$};
\draw [->, thick] (C') -- (D) node[midway, above] {\footnotesize $D^{(3)}$};
\draw [->, thick] (D) -- (E) node[midway, above] {\footnotesize $D^{(2)}$};


%dots
\draw [thick, dotted] (3.7,-1.6) -- (4.8,-1.6);



%vertical arrow
\draw [->, thick] (-3.5,1) --(-3.5,-1);

%bending arrow
\draw[->, thick] (A)  to [out=60,in=120, looseness=1]
(C);
\draw[->, thick] (A)  to [out=60,in=120, looseness=1]
(D);
\draw[->, thick] (A)  to [out=60,in=120, looseness=1]
(E);

\node [right] at (-3.5,0) {{\footnotesize $\displaystyle \pi_1$}};
\end{tikzpicture}
\end{center}
\end{figure}

\end{document}

Now, to be honest, this is not the best way to draw this kind of graph. You should learn hox to use chains, and draw edges, maybe using the quotes library. I didn't modify too much your code since you're not familiar with TikZ, but you would find many great examples of Markov chains on this site.

Best Answer

Related Solutions

tikz-pgf – Drawing a Markov Chain Using Tikz

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