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    %% Specify _r_-Axis Tick Values and Labels
% Create a polar plot. Display tick marks and grid lines along the _r_-axis
% at the values 0.1, 0.3, and 0.5. Then, specify a label for each tick
% mark.

theta = linspace(0,2*pi);
rho = theta/10;
polarplot(theta,rho)
rticks([0.1 0.25 0.5])
rticklabels({'r = .1','r = .3','r = .5'})