In directed graph how to place a letter over a node?

Question

In directed graph how to place a letter over top MWE T1 to place letter p1. i tried but the letter goes far and i need without disturbing any other node to place it and how to omit the link numbers.

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{arrows, positioning, automata}
\begin{document}
\begin{figure}
\begin{tikzpicture}[>=stealth',shorten >=1pt,node distance=2cm,on grid,initial/.style={}]
    \node[state] (T1) {$T1$};
    \node[state] (T4) [below =of T1] {$T4$};
    \node[state] (T3) [left  =of T4] {$T3$};
    \node[state] (T2) [left  =of T3] {$T2$};
    \node[state] (T5) [right =of T4] {$T5$};
    \node[state] (T6) [right =of T5] {$T6$};
    \node[state] (T8) [below =of T4] {$T8$};
    \node[state] (T7) [left  =of T8] {$T7$};
    \node[state] (T9) [right =of T8] {$T9$};
    \node[state] (T10) [below =of T8] {$T10$};
    \node [above =of T1] {$P1$};
    \node [above =of T2] {$P1$};
    \node [above =of T3] {$P2$};
    \node [above =of T4] {$P3$};
    \node [above =of T5] {$P3$};
    \node [above =of T6] {$P3$};
    \node [above =of T7] {$P2$};
    \node [above =of T8] {$P1$};
    \node [above =of T9] {$P2$};
    \node [above =of T10] {$P2$};
    \tikzset{mystyle/.style={->,double=black}}
    \tikzset{every node/.style={fill=white}}
    \path (T1) edge [mystyle] node {$18$} (T2);
    \path (T1) edge [mystyle] node {$12$} (T3);
    \path (T1) edge [mystyle] node {$9$}  (T4);
    \path (T1) edge [mystyle] node {$11$} (T5);
    \path (T1) edge [mystyle] node {$14$} (T6);
    \path (T2) edge [mystyle] node[pos=0.7] {$19$} (T8);
    \path (T2) edge [mystyle] node {$16$} (T9);
    \path (T3) edge [mystyle] node[pos=0.7] {$23$} (T7);
    \path (T4) edge [mystyle] node {$27$} (T8);
    \path (T4) edge [mystyle] node {$23$} (T9);
    \path (T5) edge [mystyle] node {$13$} (T9);
    \path (T6) edge [mystyle] node {$15$} (T8);
    \path (T7) edge [mystyle] node {$17$} (T10);
    \path (T8) edge [mystyle] node {$11$} (T10);
    \path (T9) edge [mystyle] node {$13$} (T10);
\end{tikzpicture}

\end{figure}
\end{document}

I'm not sure I understand what you want the final output to look like. And by "link numbers" do you mean the numbers in the arrows or in the nodes themselves? — Alan Munn, Dec 24 '15 at 17:33
Do you mean something like \node[state,label=above:P1] (T1) {$T1$};? — Torbjørn T., Dec 24 '15 at 23:26

score 2 · Answer 1 · edited Apr 13 '17 at 12:35

Do you want something like this?

As Torbjørn T. said you can use label to place nodes labelling the main nodes. You need to vary the positions a bit to avoid conflicts. I'm not sure what the point of double=black is. It makes more sense if you also have draw=white. I've updated the arrow specifications to use the current library.

\documentclass[tikz,border=10pt]{standalone}
\usetikzlibrary{arrows.meta, positioning, automata}
\begin{document}
\begin{tikzpicture}[>={Stealth[color=black]},shorten >=1pt,node distance=2cm,on grid,initial/.style={}]
  \node[state, label=above:$P1$] (T1) {$T1$};
  \node[state, label=95:$P3$] (T4) [below =of T1] {$T4$};
  \node[state, label=above:$P2$] (T3) [left  =of T4] {$T3$};
  \node[state, label=above:$P1$] (T2) [left  =of T3] {$T2$};
  \node[state, label=above:$P3$] (T5) [right =of T4] {$T5$};
  \node[state, label=above:$P3$] (T6) [right =of T5] {$T6$};
  \node[state, label=120:$P1$] (T8) [below =of T4] {$T8$};
  \node[state, label=95:$P2$] (T7) [left  =of T8] {$T7$};
  \node[state, label=85:$P2$] (T9) [right =of T8] {$T9$};
  \node[state, label=95:$P2$] (T10) [below =of T8] {$T10$};
  \begin{scope}[every edge/.append style={->, double=black, draw=white}]
    \path (T1)
      edge   (T2)
      edge   (T3)
      edge   (T4)
      edge   (T5)
      edge   (T6);
    \path (T2)
      edge   (T8)
      edge   (T9);
    \path (T3) edge   (T7);
    \path (T4) edge   (T8);
    \path (T4) edge   (T9);
    \path (T5) edge   (T9);
    \path (T6) edge   (T8);
    \path (T7) edge   (T10);
    \path (T8) edge   (T10);
    \path (T9) edge   (T10);
  \end{scope}
\end{tikzpicture}
\end{document}

when i compile it shows an error I can't find file tikzlibraryarrows.meta.code.tex — KBM, Dec 25 '15 at 06:19
Presumably you have an outdated version of PGF/TikZ. You can just switch back to arrows and stealth rather than arrows.meta and Stealth[], although updating your TeX distribution is recommended. — cfr, Dec 25 '15 at 17:11

In directed graph how to place a letter over a node?

1 Answers1