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Hi, I Have seen the code [ mag,phase] = bode(sy s) but when i try to see the values of mag, or phase, it returns something like mag(:,:,1). What is the significance of the stuff in the brackets? How can i just get the magnitude values with respect to frequency so I can plot a 2d plot of the magnitude and frequency?
Magnitude and phase outputs of bode are 3-D arrays, for representing multi-input multi-output systems. The first two dimensions correspond to the number of inputs and outputs, the third dimension corresponds to the number of frequency points. In your case you have a single-input single-output system, so size(mag) is 1 1 n, where n is the number of frequency points.
To get a standard bode plot you can just do
If you want access to mag and phase as regular vectors, just do
All of this is covered in the doc.
More Answers (4)
gives you the same plot for magnitude as bode.
If it does not look the same, it is because the axes limits do not line up. You can customize that and other plot parameters to your liking as described here.
Arkadiy Turevskiy on 3 May 2012
% replace 100 with desired number of points
[mag,phase] = bode(sys,win);
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