Hello Holger,
thank you for reporting this issue!
It seems as if the oscillations arise due to problems in the math
engine. I accept this as bug report and will investigate.
In the meantime, you can use \addplot[black] gnuplot .... (with the same
expression) or try to re-formulate the expression.
Best regards
Christian
Am 19.04.2011 09:40, schrieb Holger Maune:
> Hi,
>
> I tried to plot the formula $(1+2x(1+x+25^2x))/(1+4x(1+x+25^2x))$ within a
> semilog axis. I get ripples on the y-values. Here the code:
>
> \documentclass{minimal}
> \usepackage{pgfplots}
> \begin{document}
> \begin{tikzpicture}
> \begin{semilogxaxis}[domain=1e-2:1e3, samples=101]
> \addplot[black] {(1+2*x*(1+x+25^2*x))/(1+4*x*(1+x+25^2*x))};
> \end{semilogxaxis}
> \end{tikzpicture}
> \end{document}
>
> pfgplots 1.4.1 from texlive2010
>
> Any idea, whats going on here?
>
> Thanks
>
> Holger
>
>
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