Re: On constants and D's behaviour

*To*: mathgroup at smc.vnet.net*Subject*: [mg52462] Re: [mg52428] On constants and D's behaviour*From*: Andrzej Kozlowski <akoz at mimuw.edu.pl>*Date*: Sun, 28 Nov 2004 01:06:44 -0500 (EST)*References*: <200411270640.BAA17097@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

On 27 Nov 2004, at 07:40, Nicolas Girard wrote: > Dear people, > just a thought, from a frustrated mind: > > given that one can explicitely tell a symbol is a constant by modifying > its attributes, then why the hell doesn't the partial derivative D take > advantage of it, and treat nonconstant symbol as.... nonconstants, by > default ?? > > Cheers, > Nicolas > > > > Why should D duplicate another functions behaviour? Use Dt instead of D: Dt[c, x] Dt[c, x] SetAttributes[c, Constant] Dt[c, x] 0 Andrzej Kozlowski Chiba, Japan http://www.akikoz.net/~andrzej/ http://www.mimuw.edu.pl/~akoz/

**References**:**On constants and D's behaviour***From:*Nicolas Girard <nicolas.girard@strasbourg.fr>