Hello Christian,
>>> \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.uups. It seems that I have responded to the wrong mailing list ... Sorry. Ok, good to know that this is another feature. Anyway, will this be fixed in the next version or is it too hard to track down? Best regards, Stefan
smime.p7s
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