Am 04.11.2010 22:38, schrieb Stefan Pinnow:
>> \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
>
Hello,
I fear the '\x' macro in pgf can be considered as a bug... I think that
using '(\x)' instead of '\x' will fix those problems. Note that your
pgfplots example doesn't use '\x' -- it uses 'x' only which is a
different feature.
best regards
Christian
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