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Don't understand Plot behavior


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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