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

Re: Derivative

• To: mathgroup at smc.vnet.net
• Subject: [mg43779] Re: Derivative
• From: Paul Abbott <paul at physics.uwa.edu.au>
• Date: Sat, 4 Oct 2003 02:04:57 -0400 (EDT)
• Organization: The University of Western Australia
• References: <blcqiv$p7d$1@smc.vnet.net> <blgiq3$g61$1@smc.vnet.net> <blj5lk$1f5$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

In article <blj5lk$1f5$1 at smc.vnet.net>,
 "extrabyte" <extrabyte22 at libero.it> wrote:

> Paul Abbott wrote:
> > and compute its derivative with respect to y.
> >
> >   dhdy[x_, y_] = Simplify[D[h[x,y],y]];
> 
> ehm, "Simplify" or "Evaluate"?

Evaluate is not required because Set (=) is used instead of SetDelayed 
(:=). Simplify is likely to be better because you then need to 
numerically integrate dhdy.

Cheers,
Paul

-- 
Paul Abbott                                   Phone: +61 8 9380 2734
School of Physics, M013                         Fax: +61 8 9380 1014
The University of Western Australia      (CRICOS Provider No 00126G)         
35 Stirling Highway
Crawley WA 6009                      mailto:paul at physics.uwa.edu.au 
AUSTRALIA                            http://physics.uwa.edu.au/~paul