Bode plot from a string of complex numbers

Question

Simen V-S 2011-12-10

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https://ww2.mathworks.cn/matlabcentral/answers/23572-bode-plot-from-a-string-of-complex-numbers

I am trying to plot a Bode plot based on a string of comlpex numbers. Thus I have tried to convert the string to corresponding magnitude in decibles and angles in degrees. I use the following code:

R9 = 20*log(abs(nspeed));

theta9 = (180/pi())*(angle(nspeed));

However, when I plot this it is ovious that the code thus not return angles below -180. Does anyone know how this can be solved?

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Answer 1

Abhishek Gupte 2011-12-11

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The ANGLE function returns angles only between +/- pi. When the 'actual' angle goes above pi or below -pi, the ANGLE function will wrap the values. To get the 'actual' values, use the UNWRAP function.

theta9_unwrapped = unwrap( theta9 );