Mathematica 9 is now available
Services & Resources / Wolfram Forums / MathGroup Archive
-----

MathGroup Archive 2012

[Date Index] [Thread Index] [Author Index]

Search the Archive

Problem with Manipulate and OutputSystems

  • To: mathgroup at smc.vnet.net
  • Subject: [mg128446] Problem with Manipulate and OutputSystems
  • From: "Eduardo M. A. M. Mendes" <emammendes at gmail.com>
  • Date: Sat, 20 Oct 2012 00:32:45 -0400 (EDT)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • Delivered-to: l-mathgroup@wolfram.com
  • Delivered-to: mathgroup-newout@smc.vnet.net
  • Delivered-to: mathgroup-newsend@smc.vnet.net

Dear All

I am trying to build an example of third order system with Manipulate.   Here are the commands

order2withzero[=CE=B6_, =CF=89_, =CE=B3_] :=
  TransferFunctionModel[=CF=89^2/((s^2 + 2 =CE=B6 =CF=89 s + =CF=89^2)*(=CE=B3*s + 1)), s];

Manipulate[{sys = order2withzero[1/5, 5, =CE=B3],
  sys2 = order2withzero[1/5, 5, 0],
  Plot[{OutputResponse[sys, UnitStep[t], t],
     OutputResponse[sys2, UnitStep[t], t]} // Evaluate, {t, 0,
    5 + UnitStep[4*=CE=B3 - 5]*4*=CE=B3}, PlotRange -> All]},
 Style["Second Order System with an extra pole" , Bold], {=CE=B3, 0.01, 3,
  Appearance -> "Labeled"}]

Problems:

a) After shift-enter Mathematica shows me a response of unstable system but the defined systems is always stable. How come?  Have I done something wrong?
b) For some values of gamma, Mathematica shows an incomplete plot of one the responses.   Why? 

Many many thanks

Ed





  • Prev by Date: Re: Filling between lines in ListPlot not working
  • Next by Date: Re: Export Data from Mathematica to Excel
  • Previous by thread: Re: Front end - Error when saving file
  • Next by thread: How to convert the expression 3*x to a function in Mathematica?