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Re: Don't understand Plot behavior
*To*: mathgroup at smc.vnet.net
*Subject*: [mg39995] Re: Don't understand Plot behavior
*From*: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
*Date*: Fri, 14 Mar 2003 04:45:35 -0500 (EST)
*Organization*: Universitaet Leipzig
*References*: <b4pf6u$bu4$1@smc.vnet.net>
*Reply-to*: kuska at informatik.uni-leipzig.de
*Sender*: owner-wri-mathgroup at wolfram.com
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
Alain Cochard wrote:
>
> In[1]:= f[t_]:= D[t , t]
>
> In[2]:= Plot[Evaluate[f[t]] , {t, 0, 1}]
>
> Out[2]= -Graphics- [The plot is fine]
>
> In[3]:= Plot[{Evaluate[f[t]],0} , {t, 0, 1}]
>
> -8
> General::ivar: 4.16667 10 is not a valid variable.
>
> [...]
>
> General::stop: Further output of General::ivar
> will be suppressed during this calculation.
>
> Plot::plnr: Evaluate[f[t]] is not a machine-size real number at t =
> -8
> 4.16667 10 .
>
> [...]
>
> General::stop: Further output of Plot::plnr
> will be suppressed during this calculation.
>
> Out[3]= -Graphics- [The plot just shows the axes]
>
> In[4]:= harhar=Evaluate[f[t]]; Plot[{harhar,0} , {t, 0, 1}]
>
> Out[4]= -Graphics- [The plot is fine]
>
> In[5]:= $Version
>
> Out[5]= 4.1 for Sun Solaris (November 8, 2000)
>
> Is this behavior normal? Thx in advance.
>
> Alain Cochard
> al2 at noos.fr
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