how to plot phase graph for given optimised coefficient of second order
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b = [0.9999 0.9837 -0.2876];
a = [ 0.9896 -0.2869];
the coefficients are given as above
回答（1 个）
Star Strider
2017-3-19
You did not provide a sampling frequency, so I assume this is a continuous-time transfer function.
One option is to use the Signal Processing Toolbox freqs function. (Use the freqz function with a sampling frequency for a discrete system. See the documentation on the various functions for details.)
The Code_ —
b = [0.9999 0.9837 -0.2876];
a = [ 0.9896 -0.2869];
figure(1)
freqs(b, a, 2^14)
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2017-3-19
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