create a vector of the radius r2 from r2 = r1 to r2 = 3r1 with 11 elements in matlab

main.m
r1 = 1; % radius r1
r2 = linspace(r1, 3*r1, 11); % create a vector of the radius r2 from r2 = r1 to r2 = 3r1 with 11 elements
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