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Re: pole/zero plot for TransferFunctionModel in the control system package?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg125426] Re: pole/zero plot for TransferFunctionModel in the control system package?
  • From: Bob Hanlon <hanlonr357 at gmail.com>
  • Date: Tue, 13 Mar 2012 03:07:34 -0500 (EST)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com

Using RootLocusPlot the open - loop poles, closed - loop poles, and
open - loop zeros are marked using "\[FilledSmallCircle]", "*", and
"\[SmallCircle]", respectively

RootLocusPlot[k*((s^2 + 2*s + 4)/
        (s*(s + 4)*(s + 6)*
           (s^2 + 1.4*s + 1))),
   {k, 0, 150}]


Bob Hanlon

On Mon, Mar 12, 2012 at 5:07 AM, Nasser M. Abbasi <nma at 12000.org> wrote:
>
> I was looking at the functions in the control systems, which
> were added in V 8, and there seems to be a missing an important
> plot function to generate automatically a map of the locations
> of the poles and zeros for a transfer function (continuous or
> discrete time).
>
> Unless I overlooked it, I hope this will be added in V 9.
>
> I know I can generate such a plot myself by some extra coding,
> but I think a build-in function to do this would be a better solution
> similar to all the other useful standard control systems plot functions
> listed here
>
> http://reference.wolfram.com/mathematica/guide/ClassicalAnalysisAndDesign.html
>
> Another software has this function as standard in their control
> systems toolbox and it is called pzmap (for googling and
> reference to what this command do).
>
> thanks,
> --Nasser
>
>



-- 
Bob Hanlon



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