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Re: Better Set or Set Delayed ?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg45195] Re: Better Set or Set Delayed ?
  • From: "Jean.Pellegri" <Jean.Pellegri at wanadoo.fr>
  • Date: Sat, 20 Dec 2003 05:56:01 -0500 (EST)
  • References: <brs4pd$ihn$1@smc.vnet.net> <bruqtq$t0v$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

"Paul Abbott" <paul at physics.uwa.edu.au> a écrit dans le message de
news:bruqtq$t0v$1 at smc.vnet.net...
>  How about
>
>  Laplacian[f_]:= Laplacian[f]= Function[{x,y},
>    Evaluate[Derivative[2,0][f][x,y]+Derivative[0,2][f][x,y]]]
>
> This computes and stores the Laplacian of phi as a pure function. Then
> you can compute values a particular points, such as
>
>  Laplacian[phi][3,4]
>
> efficiently.


Of genious

Thanks and Ciao

-- 
< Jean Pellegri >
"fortitudo mea in rota"
F - 93100 Montreuil
I - 54023 Filattiera



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