How can I draw snake arrow in automata using tikz?

Question

I find:

\begin{tikzpicture}
\draw [->,decorate,decoration=snake] (0,0) -- (2,0);
\end{tikzpicture}

in TikZ manual, but dose not work! How can i draw snake edges in automata using tikz?

Answer 1

The following code compiles:

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{decorations.pathmorphing}
%\usepackage{pgfplots} %% Using pgfplots package alone works as well.

\begin{document}

\begin{tikzpicture}
\draw [->,decorate,decoration=snake] (0,0) -- (2,0);
\end{tikzpicture}

\end{document}

This yields the output in the manual.

But as the manual suggests,

\begin{tikzpicture}
\draw [->,decorate,decoration={snake,amplitude=.4mm,segment length=2mm,post length=1mm}]
(0,0) -- (3,0);
\end{tikzpicture}

yields a better output as follows: