Good evening Adam,
As already mentioned in a previous mail, the \pgfplotspointmeta macro
expands to the log coordinate which leads to unwanted results here.
There are basically two alternatives to access the original value:
1. compute it :
*nodes* *near*
*coords*=\rotatebox{45}{{\pgfkeys{/pgf/fpu}\pgfmathparse{exp(\pgfplotspointmeta)}\pgfmathprintnumber[sci]\pgfmathresult}},
the [sci] uses scientific notation here.
2. do some technical thing to (re)store the original value. This should
lead to the same result (but has slightly higher precision):
*nodes* *near* *coords*=\rotatebox{90}{\pgfmathprintnumber[sci]\value},
visualization depends on=rawy \as \value,
the 'rawy' is a math "constant" which always expands to the unprocessed
("raw") y coordinate.
I hope this helps.
Best regards
Christian
PS
I deliberately took the freedom and posted a copy of the reply to the
pgfplots mailing list.
Am 22.09.2011 23:18, schrieb Adam Edgar:
> I have been trying to construct a bar graph of data that is best represented
> with a logarithmic scale for the Y axis. On this graph I would like to
> display the value above each bar. However what is displayed above each bar
> seems to be the power of 10 not the original value. This is probably best
> presented as a visual but I am not sure if you can/want to receive files
> attached. So below I have put the code I used to generate the graphs and
> hopefully you'll see my issue:
>
> \documentclass{article}
> \usepackage{fullpage}
> \usepackage{tikz}
> \usepackage{pgfplots}
> \pgfplotsset{width=\linewidth,scale only axis,height=6cm}
> \begin{document}
> \begin{tikzpicture}[scale=1.0]
> \begin{axis}[
> ymode=log,
> width=\linewidth,
> anchor=north west,
> legend style={at={(0.5,-0.15)}, anchor=north, legend columns=-1},
> enlargelimits=0.1,
> ybar,
> ylabel=Time(s),
> symbolic x coords={1-Proc,2-Proc,4-Proc,8-Proc,16-Proc,32-Proc,64-Proc},
> xtick=data,
> nodes near coords,
> bar width=19pt,
> enlarge x limits=0.10,
> nodes near coords=\rotatebox{45}{\pgfmathprintnumber{\pgfplotspointmeta}},
> ]
> \addplot coordinates {(1-Proc,8.20) (2-Proc,8.66)
> (4-Proc,10.40)(8-Proc,17.46)(16-Proc,35.71)(32-Proc,91.18)(64-Proc,68.39)};
> \addplot coordinates {(1-Proc,0.23) (2-Proc,0.49)
> (4-Proc,1.15)(8-Proc,6.33)(16-Proc,20.69)(32-Proc,115.24)(64-Proc,340.13)};
> \legend{User,System}
> \end{axis}
> \end{tikzpicture}
> \end{document}
>
>
> I believe the issue is related to the fact that \pgfplotspointmeta has been
> modified in order to calculate the height of the bar and is not available in
> its original form when \pgfmathprintnumber is called on it. Do you have any
> suggestions on how to get the original value back for display?
>
> Thanks much,
>
> ASE
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