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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>