PS
I am sure this is not a problem... but just for you to note: your
minimal example contains xmin=-10 which is silently ignored by pgfplots
because log(-10) does not exist.
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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