Hi Neal,
this is a bug, indeed... it happens because the displayed data range
becomes too small.
After application of logs, you find the data range
log( [1000,1001]) = [ 6.90775527898214 , 6.90875477931522]
for linear axes, pgfplots applies some rescaling and shifting to reduce
the problem. For log axes, it keeps the logs as-is which beats you here.
A work-around would be to type "xmax=1090" (i.e. to enlarge the
displayed limit manually).
How important is that fix for you? Do you report it for reasons of
anoyance and of completeness (probably both true) or do you really need
a log plot with such a small data range?
Kind regards
Christian
Am 27.05.2013 14:31, schrieb Neal H. Walfield:
> Consider the following plot:
>
> \documentclass{article}
>
> \usepackage{pgfplots}
> \pgfplotsset{compat=1.8}
>
> \begin{document}
> \def\x{1001}
> \begin{tikzpicture}
> \begin{semilogxaxis}
> \addplot coordinates {
> (1000, 0)
> (\x, 1)
> };
> \end{semilogxaxis}
> \end{tikzpicture}
> \end{document}
>
> Compiling this, I get:
>
> ! Dimension too large.
> <recently read> \pgf@xx
>
> l.14 \end{semilogxaxis}
>
> This happens for values of \x up to 1075.
>
> I think this is a bug. I tested against 1.8.
>
> Thanks,
>
> Neal
>
>
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