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Matlab help (Root Locus using Z Domain)

  1. Apr 12, 2005 #1
    I'm trying to prooduce a plot of a root locus for an open loop transfer function.
    The transfer function is in the z-domain, with a gain K. I've already solved for the charectoristic equation of the system by hand.

    But, how do I use Matlab to plot the root locus of a transfer function in the Z - Domain? I've seen examples in the Laplace (s) Domain...do these work the same way? (as in...i won't need to do anything differently?)

    thank you.
  2. jcsd
  3. Apr 14, 2005 #2


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    When describing your system in Matlab you must inform the sampling time. Matlab will automatically know that you are using a discrete variable. The command rlocus will draw your root locus for your z variable.
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