HELP PLZ: group delay of analog chebyshev filter in matlab

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Heidi.Eissa

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i design 10th order analog low pass chebyshev filter & i want to plot its group delay versus frequency. i've already plotted using bode command , the phase & mag. response & i know that the group delay is the negative of the derivative of the phase of transfer function but how can i plot the group delay on matlab ??

thanks in advance !
 

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