Plotting Problem

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Hello everyone,

It seems there are computation problem when plotting functions

I try to plot the function x^2-2x-1 between -15 and 17.
I wrote this code:
----------------------------------------------------------
\documentclass[10pt]{article}
\usepackage{pgf,tikz}
\pagestyle{empty}
\begin{document}
\begin{tikzpicture}[x=0.5cm,y=0.5cm]
\clip (-15,-10) rectangle (17,10);
\draw[smooth,domain=-15:17] plot(\x,{\x^2-2*\x-1});
\end{tikzpicture}
\end{document}
------------------------------------------------------------------------

I compile with PdfLatex and I have this message error:
[PDFLatex]: Missing $ inserted. ...mooth,domain=-15:17] plot(\x,{\x^2-2*\x-1})

If I give a little interval, for example between -1 and 3, there's no problem.
Hence I think there is a bug with too higher value for the function.

Am I right?
Regards

Loïc


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