modificato in
`% A simple fault tree
% Author: Zhang Long, Mail: zhangloong[at]gmail.com
%\def\pgfsysdriver{pgfsys-dvipdfm.def}
\documentclass{article}
%\usepackage[latin1]{inputenc}
%\usepackage{tikz}
%\usetikzlibrary{
%trees,
%positioning,
%arrows}
\begin{document}
\begin{tikzpicture}[>=latex',
comp/.style={circle,draw}]
%% Draw system flow diagram
[>=latex',
comp/.style={circle,draw}]
\node [comp] (ca1) {determinata};
\node[comp] (ca2)
{indeterminata};
\node[comp] (ca3)
{impossibile};
\node [comp] (cb) [above=of ca2] {una disequazione è};
\draw[->] (cb)–(ca1);
\draw[->] (cb)–(ca2);
\draw[->] (cb)–(ca3);
\end{tikzpicture}
\end{document}
`
il log
`This is pdfTeX, Version 3.1415926-2.3-1.40.12 (Web2C 2011)
This is pdfTeX, Version 3.1415926-2.3-1.40.12 (Web2C 2011) (format=pdftex 2011.7.30) 4 OCT 2011 08:38
entering extended mode
\write18 enabled.
file:line:error style messages enabled.
%&-line parsing enabled.
**C:/Users/claudio/AppData/Local/Temp/qtikz/temptikzcodeHp1456.tex
(c:/Users/claudio/AppData/Local/Temp/qtikz/temptikzcodeHp1456.tex
c:/Users/claudio/AppData/Local/Temp/qtikz/temptikzcodeHp1456.tex:1: Undefined c
ontrol sequence.
l.1 \documentclass
[compress]{beamer}
c:/Users/claudio/AppData/Local/Temp/qtikz/temptikzcodeHp1456.tex:1: ==> Fatal
error occurred, no output PDF file produced!
`
log uguale 🙁 🙁