# Polaraxis nonaligned negative yticklabel

I would like to plot a polar plot in dB scaling, in this case I have positive and negative values. Usually a negative radius is plotted in the opposite direction, but with the help of transforming the coordinates I get the result I want.

But now there exists the problem that the negative and positive ticks are not perfectly aligned. I tried a hint but this only corrects the offset a bit. This could be due to the fact that the solution was given for a rotating ticks problem.

How can I get the radius axis ticks correctly aligned?

\documentclass{standalone}
\usepackage{pgfplots}
\usepgfplotslibrary{polar}

\begin{document}
\begin{tikzpicture}
\begin{polaraxis}[%
xtick={0,30,...,180},
ymin=-25,
ymax=10,
xmax=180,
y coord trafo/.code=\pgfmathparse{#1+25},
y coord inv trafo/.code=\pgfmathparse{#1-25},
xticklabel=$\pgfmathprintnumber{\tick}^\circ$,
yticklabel style={yshift=-0.5cm},
],
]
coordinates{%
(0,-15)
(30,-5)
(90,0)
(120,5)
};
\end{polaraxis}
\end{tikzpicture}
\end{document}

• I am not sure what you think is misaligned. I think you mean that the negative yticklabels are a bit shifted to the right, right? But in fact the nodes are perfectly centered when you take the minus sign into account. To show that, you can add draw=red to the yticklabel style options. (And I recommend using anchor=near yticklabel opposite instead of yshift.) – Stefan Pinnow Nov 15 '16 at 17:17
• Did my tip help you or do you need further assistance? – Stefan Pinnow Nov 19 '16 at 18:40
• Thank you very much, I tried to use anchor=below which is not allowed. An anchor=north also seems to yield the same result. If you post this as an answer, I will accept it. Thank you very much. – Roos Nov 21 '16 at 14:23

As already mentioned in the comment below the question, the tick labels are perfectly aligned. Have a look at the comments in the code for more details.

\documentclass{standalone}
\usepackage{pgfplots}
\usepgfplotslibrary{polar}
\begin{document}
\begin{tikzpicture}
\begin{polaraxis}[
ymin=-25,
ymax=10,
xmax=180,
% when you have at PGFPlots v1.13 you can use the xtick distance' feature
%            xtick={0,30,...,180},
xtick distance=30,
y coord trafo/.code=\pgfmathparse{#1+25},
y coord inv trafo/.code=\pgfmathparse{#1-25},
xticklabel=$\pgfmathprintnumber{\tick}^\circ$,
yticklabel style={
% draw a frame around the tick labels to see, that they are
% indeed centered
draw=red,
% (and use there is a better way to position the tick labels
% on the other side of the axis ...)
%                yshift=-0.5cm,
anchor=near yticklabel opposite,
},
],
`