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MathGroup Archive 2003

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Re: Derivative

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

In article <blj5lk$1f5$1 at>,
 "extrabyte" <extrabyte22 at> 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.


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 

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