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+%%
+%% Ein Beispiel der DANTE-Edition
+%%
+%% 1. Auflage
+%%
+%% Beispiel 09-03-2 auf Seite 166.
+%%
+%% Copyright (C) 2012 Herbert Voss
+%%
+%% It may be distributed and/or modified under the conditions
+%% of the LaTeX Project Public License, either version 1.3
+%% of this license or (at your option) any later version.
+%%
+%% See http://www.latex-project.org/lppl.txt for details.
+%%
+%%
+%% ====
+% Show page(s) 1
+%%
+%%
+\documentclass[]{exaarticle}
+\pagestyle{empty}
+\setlength\textwidth{121.16928pt}
+\setlength\parindent{0pt}
+%StartShownPreambleCommands
+\usepackage{luacode}
+\def\getVLength(#1,#2)(#3,#4){%
+ \directlua{tex.print(math.sqrt((#3-#1)^2+(#4-#2)^2))}\\
+ \luaexec{tex.print(string.format("\%.4f",%
+ (math.sqrt((#3-#1)^2+(#4-#2)^2))))}}
+%StopShownPreambleCommands
+\begin{document}
+Negative Zahlen extra Klammern!\par
+\getVLength((-1),(-2))(4,2)
+\end{document}