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