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I've been trying to plot coordinates using the polar library of PGFplots, but the plot is just... wrong? Like the points are just not at the right position, and I'm not too sure what I'm missing. I'm pretty sure it may have something to do with using radians instead of degrees, but when I use radians to graph, they turn out fine. I would really prefer not to use degrees, but if it's the only solution, then I'll do the conversions. I'm also struggling to figure out how to change the actual infill color of the nodes. I've been referencing section 4.7.1, and in the code below I use fill, draw, and color, but the infill remains the same. Any help would be greatly appreciated. :)

\documentclass{report}
\usepackage{amsmath}
\usepackage{pgfplots}
\pgfplotsset{compat=1.18}
\usepgfplotslibrary{polar}
\begin{document}
\[
\begin{array}{c|c}
\text{Name}&(r,\theta)\\\hline
A&(1,\dfrac{\pi}{3})\\
B&(2,\dfrac{3\pi}{4})\\
C&(3,\dfrac{7\pi}{6})\\
D&(-1,\dfrac{2\pi}{3})\\
\end{array}\implies\begin{tikzpicture}[baseline=(current bounding box.center)]                                
\begin{polaraxis}[xticklabels={,0,$\frac{\pi}{6}$,$\frac{\pi}{3}$,$\frac{\pi}{2}$,$\frac{2\pi}{3}$,$\frac{5\pi}{6}$,$\pi$,$\frac{7\pi}{6}$,$\frac{4\pi}{3}$,$\frac{3\pi}{2}$,$\frac{5\pi}{3}$,$\frac{11\pi}{6}$}]
\addplot+ [trig format plots=rad, data cs=polarrad,only marks,color=black, mark color=black,draw=black,fill=black,] coordinates {(1,pi/3)(2,3*pi/4)(3,7*pi/6)(-1,2*pi/3)};
\end{polaraxis}
\end{tikzpicture}
\]
\end{document}

enter image description here

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  • I do not use pgfplots because of how many keys it requires practitioners to remember. However, I would assert that this would be easy to make in plain tikz using a couple of nested for loops and some basic primitives. I can't debug pgfplots though, beyond the basics. Commented yesterday

1 Answer 1

Reset to default
6

Swap the radius and the angle. Write

(pi/3,1)(3*pi/4,2)(7*pi/6,3)(2*pi/3,-1)

instead of

(1,pi/3)(2,3*pi/4)(3,7*pi/6)(-1,2*pi/3)

Example:

\documentclass{report}

\usepackage{amsmath}
\usepackage{pgfplots}
\pgfplotsset{compat=1.18}
\usepgfplotslibrary{polar}

\begin{document}

\[
\begin{array}{c|c}
\text{Name}&(r,\theta)\\\hline
A&(1,\dfrac{\pi}{3})\\
B&(2,\dfrac{3\pi}{4})\\
C&(3,\dfrac{7\pi}{6})\\
D&(-1,\dfrac{2\pi}{3})\\
\end{array}
\implies
\begin{tikzpicture}[baseline=(current bounding box.center)]                                
  \begin{polaraxis}[
      xticklabels = {,0,$\frac{\pi}{6}$,$\frac{\pi}{3}$,$\frac{\pi}{2}$,$\frac{2\pi}{3}$,$\frac{5\pi}{6}$,$\pi$,$\frac{7\pi}{6}$,$\frac{4\pi}{3}$,$\frac{3\pi}{2}$,$\frac{5\pi}{3}$,$\frac{11\pi}{6}$}
    ]
    \addplot+ [
      % trig format plots=rad % useless here
      ,data cs=polarrad
      ,only marks
      ,color=black
      ,mark color=black
      ,draw=black
      ,fill=black
    ] coordinates {(pi/3,1)(3*pi/4,2)(7*pi/6,3)(2*pi/3,-1)};
\end{polaraxis}
\end{tikzpicture}
\]

\end{document}

Example

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  • 1
    Not sure how I didn't think of that xd. I had trig format plots=rad in there since it was had fixed my graphs of polar functions, I didn't know it did not apply to points. Thanks sm! Commented yesterday
  • @humanoferth trig format plots set the format for trigonometric functions. Commented yesterday

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