Am 28.12.2011 22:04, schrieb Joseph Wright:
> On 28/12/2011 15:00, Christian Feuersaenger wrote:
>> Hi Joseph,
>>
>> thanks for the interesting question!
>>
>> (1) "Can I give errors as absolute min/max values instead of differences"?
>>
>> -> Yes, especially if you have table input: you can use 'y error
>> expr=<expression>' where<expression> is some math expression which may
>> depend on \thisrow{<colname>} (the syntax is actually the same as for y
>> expr=<expression>).
>>
>> (2) "Can I have asymmetric error bars?"
>>
>> -> Pgfplots currently expects symmetric error values (there are pending
>> feature requests to add asymmetric error bars).
>> At the time of this writing, a good work-around is to use the same plot
>> twice: once for upper and once for lower error values. In addition, one
>> of them should have "forget plot" to avoid a legend entry.
>>
>> A complete working example with your data could be
>>
>> \documentclass{article}
>>
>> \usepackage{pgfplots}
>>
>> \begin{document}
>>
>> \begin{tikzpicture}
>> \begin{axis}
>> \addplot+[forget plot,error bars/.cd,y dir=plus,y explicit]
>> table[x=x,y=y,y error expr=\thisrow{y_max}-\thisrow{y}] {
>> x y y_min y_max
>> 1 0.01 -0.01 0.02
>> 2 0.03 0.00 0.035
>> 3 -0.05 -0.06 -0.04
>> 4 0.06 0.05 0.07
>> };
>> \addplot+[error bars/.cd,y dir=minus,y explicit]
>> table[x=x,y=y,y error expr=\thisrow{y}-\thisrow{y_min}] {
>> x y y_min y_max
>> 1 0.01 -0.01 0.02
>> 2 0.03 0.00 0.035
>> 3 -0.05 -0.06 -0.04
>> 4 0.06 0.05 0.07
>> };
>> \end{axis}
>> \end{tikzpicture}
>> \end{document}
>>
>> Clearly, you will only provide the data once (either from file or using
>> \pgfplotstableread) -- but you get the idea.
>>
>> Your approach appears to have a similar effect: the idea with two data
>> sets is the same as my answer for (2). The centered set will work as
>> well from what I understand.
>>
>> I hope you enjoyed christmas! My best wishes for the new year!
>>
>> Best regards
>>
>> Christian
> Hello Christian,
>
> Ah, excellent: thanks very much. I've been asked this by someone else,
> and avoiding editing the data if possible is handy.
>
> A second question, if I may. In my demo data, you'll see that the
> y-values are all< 0.1. pgfplots automatically formats these as integers
> with a \cdot 10^{-2} applied to the axis. However, in this particular
> case I'd like to stick to printing the values as given. Usually, I edit
> the input data to deal with powers of ten, but that does not apply here.
> Various applications of /pgf/number format keys fail to achieve the
> desired outcome. Is there an easy way to print the tick labels?
Hi Joseph,
I'm glad my example appears to be useful.
Concerning the second question: yes, add 'scaled ticks=false' to your
axis (or your preamble with \pgfplotsset). This will disable any common
tick factors. As a result, only the number printer will be applied (and
only then are the /pgf/number format keys in effect). With 'scaled
ticks=true' (the default), pgfplots will compute a common scaling factor
and produce a separate node containing it. The individual tick labels
are rescaled to show only the differences.
Best regards
Christian
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