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Hi Lisa, you cannot have 50 frequencies in 30 elements. Obviously whatever Q is here (is it a power spectral density estimate?) is an estimate at only 30 frequency points.
You can space your frequency vector to cover 5 to 400 Hz with fifty points and then select a subset of those 50 so that you can plot(f,Q)
freq = linspace(5,400,50); % just making up some junk data to plot Q = abs(randn(30,1)); plot(freq(1:30),Q)
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