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MathGroup Archive 2003

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Re: Don't understand Plot behavior

  • To: mathgroup at smc.vnet.net
  • Subject: [mg40071] Re: Don't understand Plot behavior
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Tue, 18 Mar 2003 05:50:24 -0500 (EST)
  • Organization: Universitaet Leipzig
  • References: <b4pf6u$bu4$1@smc.vnet.net> <200303140945.EAA18797@smc.vnet.net> <b4ubb9$qkl$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

it has exactly to do with "where is Evaluate[] wrapped around"

Because it does not appear "directly as the head of the function
argument"

Regards
  Jens

Dr Bob wrote:
> 
> It has nothing to do with what Evaluate is wrapped around.  From Help:
> 
> "Evaluate only overrides HoldFirst, etc. attributes when it appears
> directly as the head of the function argument that would otherwise be
> held."
> 
> Plot has attribute HoldAll, and List does not.
> 
> Bobby
> 
> On Fri, 14 Mar 2003 04:45:35 -0500 (EST), Jens-Peer Kuska
> <kuska at informatik.uni-leipzig.de> wrote:
> 
> > Hi,
> >
> > yes because Evaluate[] work only if it is
> > waraped arround a function argument or a
> > sequence of arguments, and you have to write
> >
> > Plot[Evaluate[{f[t],0}] , {t, 0, 1}]
> >
> > otherwise the List[] argument is evaluatet that
> > help Plot[] nothing.
> >
> > Regards
> > Jens


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