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Bode diagram of poor input/output signal

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Alex
Alex 2013-4-11
Hello,
I have an input signal u and an output signal y. The frequency range of the system on which I want to focus is 0-5 Hz.
Let's assume that my input signal u is a sinusoidal excitation but only at two frequencies: 1 and 2 Hz. After having filtered my signal to remove measurement noise, I can plot the Bode diagram thanks to the functions iddata and spa. I will than obtain a Bode Diagramm for the frequencies 0-5 Hz. But as the input signal only contains ~2 different frequencies, how does Matlab proceed to plot the Bode diagram for the other frequencies? I think that the result must be wrong for the frequencies not contained in the input signal.
In this case, I don't want to plot a continous Bode diagramm but a discrete Bode diagram only containing the system response for the frequencies which actually are in the input signal.
Is that possible ? Thank you and good evening.

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Rajiv Singh
Rajiv Singh 2013-5-15
bode(sys,[w1 w2],'.'), where w1 and w2 are your two input frequencies and sys is the identified model.

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