Re: Baffling change to partial derivative in version 5.1
- To: mathgroup at smc.vnet.net
- Subject: [mg61584] Re: [mg61555] Baffling change to partial derivative in version 5.1
- From: Bob Hanlon <hanlonr at cox.net>
- Date: Sun, 23 Oct 2005 05:45:48 -0400 (EDT)
- Reply-to: hanlonr at cox.net
- Sender: owner-wri-mathgroup at wolfram.com
{$Version,$ReleaseNumber} {5.2 for Mac OS X (June 20, 2005),0} I have the same problem, but only certain variable names cause the problem {#, D[x y, #, NonConstants -> {x}]}& /@ {t, ti, tim, time, timed, l, li, liv, live, lived} {{t, y*D[x, t, NonConstants -> {x}]}, {ti, y*D[x, ti, NonConstants -> {x}]}, {tim, y*D[x, tim, NonConstants -> {x}]}, {time, 0}, {timed, 0}, {l, 0}, {li, 0}, {liv, 0}, {live, y*D[x, live, NonConstants -> {x}]}, {lived, y*D[x, lived, NonConstants -> {x}]}} Bob Hanlon > > From: Steven HANCOCK <Steven.Hancock at cern.ch> To: mathgroup at smc.vnet.net > Date: 2005/10/22 Sat AM 12:35:59 EDT > Subject: [mg61584] [mg61555] 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. > >