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What is the function of the unwarp command?

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What is the function of the unwarp command?

(a) Generate smoother phase plots

(b) Generate smoother gain plots

(c) Generate smoother root locus

(d) No such command

I have been asked this question in semester exam.

Question is from Fourier Analysis and Filtering in portion Beyond the Basics of MATLAB

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Right option is (a) Generate smoother phase plots

Easy explanation: The functioning of the unwrap command is based on the tolerance limit, ‘pi’, which is used to multiply the input vector with 2*pi so that it can return values for a smoother phase plot. Hence, Generate smoother phase plots is correct.

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