draw plot \x^2, sign error [duplicate]

I try to plot quadratic fonction.

\documentclass{article}
\usepackage{tikz}

\begin{document}

\begin{tikzpicture}
\draw plot (\x,\x^2/4/1.0);
\end{tikzpicture}

good
\begin{tikzpicture}
\draw plot (\x,\x*\x/4/1.0);
\end{tikzpicture}
\end{document}


I found a solution, but why this surprising result? Is there a way to use the square function?

• I think this question has been asked before, perhaps by Peter Grill... – cmhughes Oct 23 '14 at 15:47
• – Thruston Oct 23 '14 at 15:52
• I see, It's ok. It's exactly the same interrogation. Can you close it? – Amorok Oct 23 '14 at 15:55