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    %% Increment _r_-Axis Tick Values by 10
% Display tick marks and grid lines along the _r_-axis at increments of 10,
% starting from 0 and ending at 50.

theta = 0:0.01:2*pi;
rho = 50*sin(2*theta);
polarplot(theta,rho)
rticks(0:10:50)