Have you read the documentation for ifft?
How to inverse this function IFFT?
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Z = fft(Y);
P2 = abs(Z/L);
P1 = P2(1:L/2+1);
P1(2:end-1) = 2*P1(2:end-1);
subplot(3,2,3)
plot(f,P1)
title('FFT filter signal')
xlabel('f (Hz)')
ylabel('|P1(f)|')
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