Hi Béatrice,
in order to shift the coordinates into the positive domain, you can use "y
coord trafo/.code=\pgfmathparse{#1+30}". In order for PGFplots to use the
original coordinates for the labels, simply specify the inverse
transformation as a shift back into the negative: "y coord inv
trafo/.code=\pgfmathparse{#1-30}". To let the x labels go from -180 to
+180, you could just set "xmin=-180,xmax=180". This will, however flip the
y axis to the left hand side of the plot, and the "-180/+180" coordinate
will be printed twice. For better control over the tick labels, you can set
"xtick={0,30,...,360}, xticklabels={0,30,...,180,-150,-120,...,0}". This
tells PGFplots to generate tick marks at all position starting from 0,
going up in increments of 30, ending at 360. The tick labels start at 0, go
up in increments of 30 until they reach 180, then start again at -150,
going up in increments of 30, ending at 0.
Here's the complete example, a PDF of the output is attached.
Jürnjakob
\documentclass{article}
\usepackage{pgfplots}
\usepgfplotslibrary{polar}
\begin{document}
\begin{tikzpicture}
\begin{polaraxis}[
xtick={0,30,...,360},
xticklabels={0,30,...,180,-150,-120,...,0},
y coord trafo/.code=\pgfmathparse{#1+30},
y coord inv trafo/.code=\pgfmathparse{#1-30}
]
\addplot [no markers, thick] table{data} \closedcycle;
\end{polaraxis}
\end{tikzpicture}
\end{document}
2012/1/13 Augereau Béatrice <augereau....@aliceadsl.fr>
> Hi,
>
> thanks for your answer.
>
> To be precise my goal is to obtain a graphic like the one in attached
> file (test.pdf) which results from gnuplot with the tikz terminal and
> the complete data (in attached file too). I dislike this solution
> because I have to place direction labels by hand and they're useful for
> one graphic size. That's why I want to find a solution with pgfplots. Do
> you think it's possible ?
>
> Best regards,
>
> Béatrice.
>
polarplot.pdf
Description: Adobe PDF document
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