MathGroup Archive 2005

[Date Index] [Thread Index] [Author Index]

Search the Archive

Baffling change to partial derivative in version 5.1


Please, can anyone explain (or even just reproduce) the following behaviour?


In[1]:=
$Version

Out[1]=
5.1 for Microsoft Windows (October 25, 2004)

In[2]:=
$ReleaseNumber

Out[2]=
0

In[3]:=
D[x y, t, NonConstants->{x}]

Out[3]=
y D[x, t, NonConstants -> {x}]

In[4]:=
D[x y, time, NonConstants->{x}]

Out[4]=
0


Merely changing the spelling of the variable from t to time does not 
return zero in version 4.2.
                             Thanks, Steve.


  • Prev by Date: Re: Display sound but suppress graphics
  • Next by Date: Re: Warning from Piecewise
  • Previous by thread: Re: 3D plots in different colors
  • Next by thread: Re: Baffling change to partial derivative in version 5.1