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MathGroup Archive 2003

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Don't understand Plot behavior

  • To: mathgroup at
  • Subject: [mg39971] Don't understand Plot behavior
  • From: Alain Cochard <al2 at>
  • Date: Thu, 13 Mar 2003 03:03:58 -0500 (EST)
  • Sender: owner-wri-mathgroup at

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}]

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 = 
    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

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