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MathGroup Archive 2005

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Re: Baffling change to partial derivative in version 5.1

  • To: mathgroup at smc.vnet.net
  • Subject: [mg61599] Re: Baffling change to partial derivative in version 5.1
  • From: Bill Rowe <readnewsciv at earthlink.net>
  • Date: Sun, 23 Oct 2005 05:46:06 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

On 10/22/05 at 12:35 AM, Steven.Hancock at cern.ch (Steven HANCOCK)
wrote:

>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

I get exactly the same behavior with

In[3]:= $Version
Out[3]= "5.2 for Mac OS X (June 20, 2005)"

In[4]:= $ReleaseNumber
Out[4]= 0

Clearly this is a bug since the result should be independent of the variable names
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