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.
Hi,
thanks for your request!
I am not completely sure what you expect... I understand that you want
polar axes, and from your gnuplot example I see that the origin should
have y=-30 and the outermost line 0. If I take you data and provide it
to gnuplot as such, it also seems to provide a similar output as
pgfplots - but gnuplot seems to have it rotated somehow.
Nevertheless, the label transformations seem to be possible by means of
custom transformations, perhaps
\documentclass{article}
\usepackage{pgfplots}
\usepgfplotslibrary{polar}
\begin{document}
\begin{tikzpicture}
\begin{polaraxis}[
x coord trafo/.code=\pgfmathparse{-#1},
y coord trafo/.code=\pgfmathparse{-#1},
y coord inv trafo/.code=\pgfmathparse{-30+#1},
]
\addplot table{
0 00
-1 00
-2 -01
-3 -02
-4 -04
-5 -07
-337 -22
-338 -24
-339 -30
-340 -30
-357 -02
-358 -01
-359 00
};
\end{polaraxis}
\end{tikzpicture}
\end{document}
I have attached the output of this run as png.
Perhaps you can this as starting point to derive a suitable
transformation. The inverse transformation is *only* used to generate
tick numbers, so it might not be that important (because you could
specify tick labels and positions explicitly).
Best regards
Christian
Am 09.01.2012 14:06, schrieb Augereau Béatrice:
> Hi,
>
> I am trying to set the polaraxis environment to perform an antenna
> radiation pattern graphic. The data are in degree and dB (so the y range
> is -30:0).
>
> I did that with theses gnuplot code :
> set polar
> set angle degrees
> set size square
> set grid polar
> unset key
> set trange [-pi:pi]
> set rrange [-30:0]
> set yrange [-30:30]
> set xrange [-30:30]
> set xtics axis nomirror
> unset ytics
> unset border
> # {\312} degree symbol in postscript
> set label "0{\312}" at 27,1
> set label rotate by 30 "30{\312}" at 22,14
> set label rotate by 60 "60{\312}" at 12,23
> ...
> set label rotate by -30 "-30{\312}" at 22.5,-12
> set term postscript eps enhanced mono size 8cm,8cm "Helvetica" 11
> set output "graphic.eps"
> plot "radiation_pattern.dat" w l lw 2
>
> The coordinates are in a file with the index 0 is the x (degree) and the
> index 1 is the y (radius) and are like this :
> 0 00
> -1 00
> -2 -01
> -3 -02
> -4 -04
> -5 -07
> ...
> -337 -22
> -338 -24
> -339 -30
> -340 -30
> ...
> -357 -02
> -358 -01
> -359 00
>
> Do you think it's possible to plot a such graphic with pgfplots and how to do
> this ?
>
> Thanks,
>
> Béatrice.
>
>
>
>
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test.pdf
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