Obtain plot for displacement history.
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Y = fft(diff(strainoption2));
L = size(diff(strainoption2));
L = L(1);
P2 = abs(Y/L);
P1 = P2(1:L/2+1);
P1(2:end-1) = 2*P1(2:end-1);
f = Fs*(0:(L/2))/L;
figure()
plot(f,P1)
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