transmissibility force script matlab

i tried do reproduce a plot using force transmissibility " Ft/Ky " law (in pdf )but when i plot the graph in matlab is not the same as pdf i don't know where i made a mistake in matlab script..!

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Answer 1

[Carlos Martinez]

in y(j,i) use this formula

y(j,i)=sqrt(((1+2*zeta*x(j)).^2)/(((1-x(j).^2).^2+(2*zeta*x(j)).^2)))