> \documentclass[10pt]{article}
> \usepackage{tikz}
> \pagestyle{empty}
>
> \begin{document}
> \begin{tikzpicture}
> \draw[->,color=black] (0,-5) -- (0,5);
> \draw[->,color=black] (-8,0) -- (8,0);
>
> %\draw[color=blue,samples=200,domain=0.001:8] plot
> (\x,{exp(1.0/3*ln(\x)}); \draw[color=green,smooth,samples=100]
> plot[domain=0.01:8.0] (\x,{\x^(1./3)}); %
> \draw[color=red,samples=400,domain=0.0001:8] plot function {x**(1./3)};
> \end{tikzpicture}
> \end{document}
>
> \x^(1/3) gives a bad result
>
> correct is the syntax with exp and ln or with gnuplot
>
> correct also but very slow
>
> \documentclass[10pt]{article}
> \usepackage{fp,tikz}
> \usetikzlibrary{fixedpointarithmetic}
> \pagestyle{empty}
>
> \begin{document}
> \begin{tikzpicture}
> \draw[->,color=black] (0,-5) -- (0,5);
> \draw[->,color=black] (-8,0) -- (8,0);
>
> %\draw[color=blue,samples=200,domain=0.001:8] plot
> (\x,{exp(1.0/3*ln(\x)});
> \pgfkeys{/pgf/fixed point arithmetic}
> \draw[color=green,smooth,samples=100] plot[domain=0.01:8.0]
> (\x,{\x^(1./3)});
> % \draw[color=red,samples=400,domain=0.0001:8] plot
> function {x**(1./3)};
> \end{tikzpicture}
> \end{document}
also interesting is, that pgfplots brings the correct graph. Is the fp/fpu
library used by default there?
\documentclass{article}
\usepackage{tikz}
\usepackage{pgfplots}
\begin{document}
\begin{tikzpicture}
\begin{axis}
\addplot [domain=0.01:4,samples=100] {x^(1.0/3)};
\end{axis}
\end{tikzpicture}
\end{document}
Best regards,
Stefan
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