Digital control systems and root locus

Discussion in 'Homework Help' started by hunterage2000, May 12, 2012.

  1. hunterage2000

    Thread Starter Active Member

    May 2, 2010
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    I have been trying to work through a problem and see how its done but Im not sure where the angles of 17.10 -138.52 -109.84 = -231.26 come from.

    I have attached the matlab root locus plot and the plot from the example also the ZOH transfer function is there and the dominant poles.

    I printed it out and plotted the dominant poles but the angles didnt add up to -231.26

    Can anyone suggest why and what Im doing wrong?
     
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