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MathGroup Archive 2005

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

  • To: mathgroup at smc.vnet.net
  • Subject: [mg54214] Re: [mg54201] Re: Problem using Evaluate[] inside a Plot command. 5.1
  • From: Chris Chiasson <chris.chiasson at gmail.com>
  • Date: Sun, 13 Feb 2005 22:17:02 -0500 (EST)
  • References: <cu78ub$me9$1@smc.vnet.net> <200502130521.AAA03706@smc.vnet.net>
  • Reply-to: Chris Chiasson <chris.chiasson at gmail.com>
  • Sender: owner-wri-mathgroup at wolfram.com

Suggestion:
Use block to set the value of t to whatever plot said caused an error.
Call the function from within this block. If it looks like a number,
check its full form.


On Sun, 13 Feb 2005 00:21:31 -0500 (EST), D Herring
<dherring at at.uiuc.dot.edu> wrote:
> 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
> 
> 


-- 
Chris Chiasson
Kettering University
Mechanical Engineering
Graduate Student
1 810 265 3161


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