Plot Stiffness of Unidirectional Composite in Polar Coordinate System

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I would like to recreate the following diagramm in Matlab. Throught the funktion polarplot(theta,rho) I was already able to create the figure, but I lack the knowlege to fill in the correct inputs für theta and rho. Thanks for the help.

Accepted Answer

J. Alex Lee
J. Alex Lee on 3 Jan 2023
theta and rho are respectively angle and for example
t = linspace(0,2*pi,500)';
r = cos(t).^4 + .5;
hold on
r = cos(t+pi/2).^4 + .5;
r = 0.5*cos(t-pi/4).^4 + 0.5*cos(t+pi/4).^4 + .0;

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