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?

Answer 1

[Abhishek Gupte]

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 );