How to add subscript in a vertex in tikz-latex?

user_9421400 0
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The problem I am facing is that I can define the label for each vertex, but then when I move to position the vertices south, or east, that just creates a new vertex.

\begin{figure}
\tikzstyle{VertexStyle} = [shape = ellipse,minimum width= 6ex,draw]
\tikzstyle{EdgeStyle}   = [->,>=stealth']      
\begin{tikzpicture}[scale=0.5, auto=left,every node/.style={circle}]  
\SetGraphUnit{4} 
\Vertex[L=$x_{1}$]{x};
\Vertex[L=$h_{1}$]{h};
\EA(x){h}
\Edges(x)(h)
\end{tikzpicture}
\end{figure}

Following is the output I get then:

enter image description here

tikz latex
1 Answers

For your code, line-by-line, the following is happening:

\Vertex[L=$x_{1}$]{x};

This creates a vertex (at the origin) with the name x and a Label $x_1$.

\Vertex[L=$h_{1}$]{h};

This also creates a vertex (at the origin) with the name h with a Label $h_1$.

\EA(x){h}

Here you add a vertex h to the EAst of x. The label name is h as well as the label.

\Edges(x)(h)

Now you try to add an edge between x and h.

Perhaps this is something that you might be interested in:

\Vertex[x = 1cm, L = $x_1$]{x};

Place a vertex called x with a Label $x_1$ (1cm east of the origin, just because).

\Vertex[x = 4cm, L = $h_1$]{h};

Place a vertex h with Label $h_1$ (4cm east of the origin, just so it doesn't sit on/close to x).

\Edges(x,h)

Draw an edge between nodes x and h.

\SetVertexMath

Node names and labels will include math content.

\EA(h){h_2}

Create a new vertex h_2 to the EAst of h.

\Edges(h,h_2)

Draw another edge between h and h_2.

Here is a complete minimal example:

enter image description here

\documentclass{article}

\usepackage{tkz-berge}
\usetikzlibrary{shapes}

\begin{document}

\begin{figure}
  \tikzstyle{VertexStyle} = [
    shape = ellipse,
    minimum width = 6ex,
    draw]
  \tikzstyle{EdgeStyle}   = [
    ->,
    > = stealth']      
  \begin{tikzpicture}[scale=0.5]
    \SetGraphUnit{4} 
    \Vertex[x = 1cm, L = $x_1$]{x};
    \Vertex[x = 4cm, L = $h_1$]{h};
    \Edges(x,h)
    \SetVertexMath
    \EA(h){h_2}
    \Edges(h,h_2)
  \end{tikzpicture}
\end{figure}

\end{document}
user_9146860
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