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