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MathGroup Archive 2005

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Re: Problem using Evaluate[] inside a Plot command. 5.1

  • To: mathgroup at smc.vnet.net
  • Subject: [mg54201] Re: Problem using Evaluate[] inside a Plot command. 5.1
  • From: D Herring <dherring at at.uiuc.dot.edu>
  • Date: Sun, 13 Feb 2005 00:21:31 -0500 (EST)
  • References: <cu78ub$me9$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi Nasser,

Maybe Evaluate[OutputResponse[sys,UnitStep[t], t]] is returning a value 
which needs to be Evaluate[]d again before it can be plotted?

I've never had your problem (don't even have the control toolbox), but 
maybe

Plot[{t2, Evaluate[Evaluate[OutputResponse[sys,UnitStep[t], t]]]},
       {t, 0, 3}, PlotRange -> All]

might work?

Your error message, "plot::plnr: .... is not a machine-size real
number at t=...." usually indicates the need to Evaluate[] one of the 
Plot[] arguments.

Good luck,
Daniel


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