Hi Richard,
thanks for reporting the issue. You are right, there is a bug in
pgfplots 1.4.1: the 'log basis x' feature does not work correctly for
this version.
I see the following alternatives to fix the problem:
1. Upgrade to the recently released stable version 1.5 for which the bug
has been fixed
2. Consider uncommenting 'log basis x=10'. Uncommenting it will not
change the appearance of your coordinates since pgfplots displays log in
base 10 anyway. You need this particular switch if and only if you rely
on the log of the coordinates (i.e. if you have low-level access on
something that pgfplots has computed).
Best regards
Christian
Am 06.08.2011 13:52, schrieb Richard Janis Beckert:
> Hey there!
>
> I want to plot a function, with the x-axis using logarithmic ticks, and
> placing a label on it (see my code below). The problem is: if I use a
> placement like at (axis cs:x,y), x is not actually using the same
> coordinate system as the plot, i.e. x=3 seems to be placed at x=3
> assuming a _non_-logarithmic x-axis, while it should actually be placed
> at x=log(3). I hope it is clear what I mean... Just try the code below
> (pgfplots 1.4.1).
>
> \begin{tikzpicture}
> \begin{axis}[
> axis x line=center,
> axis y line=center,
> xlabel=$t$,
> ylabel=$x$,
> xmode=log,
> log basis x=10,
> ytick=\empty,
> xmin=-10,
> after end axis/.code={\node[coordinate,pin=above:{\footnotesize x}]
> at (axis cs:3,\expnode){};}
> \addplot[domain=1:5000,samples=1000,sharp
> plot,mark=none,black,id=exp] gnuplot {10*exp(-x)};
> \pgfmathsetmacro{\expnode}{10*exp(-3)};
> \end{axis}
> \end{tikzpicture}
>
>
>
> Cheers,
> Janis
>
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