MATLAB: Plot Graph with different b Values

plot

b = [1/4, 1/2, 1, 2];
figure;
for i=1:b
    M = 1/((1-r.^2).^2+b^2*r.^2);
    plot(r,M);hold on;
end
I want to plot a graph so that M(r) graph will be shown for different values of b. Also, I want to include a legend to keep track of the four lines.
Please help!

Best Answer

b = [1/4, 1/2, 1, 2];
r=1:0.01:5;  % Example Define r, array data
for i=1:length(b)
    M=1./((1-r.^2).^2+b(i)^2*r.^2);
    plot(r,M);
    hold on;
end
legend('b=1/4','b=1/2','b=1','b=2');
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