% Plotting in polar coordinates
% Author: Stefan Kottwitz
% https://www.packtpub.com/hardware-and-creative/latex-cookbook
\documentclass[border=10pt]{standalone}
%%%<
\usepackage{verbatim}
%%%>
\begin{comment}
:Title: Plotting in polar coordinates
:Tags: Mathematics;Functions;Plots;Polar;Graphics;PGFPlots;Chapter10
:Author: Stefan Kottwitz
:Slug: polar-plot

The standard pgfplots axis environment is used for Cartesian
coordinates. However, pgfplots provides also logarithmic
axes and polar axes.

Functions can also be defined in polar coordinates.
In a polar coordinate system, each point is determined
by the distance from the origin 0 and by the angle to
a reference axis. Now, the argument of a function is
expected to be an angle, and the function value
is considered as the distance from the origin. 

The code, and more, is explained in the LaTeX Cookbook,
Chapter 10, Advanced Mathematics, Plotting functions 
in two dimensions.
\end{comment}
\usepackage{pgfplots}
\usepgfplotslibrary{polar}
\begin{document}
\begin{tikzpicture}
  \begin{polaraxis}
    \addplot[domain=0:360,samples=300] {sin(6*x)}; 
  \end{polaraxis}
\end{tikzpicture}
\end{document}