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Re: spatial finite differences in two dimensions (something like

  • To: mathgroup at smc.vnet.net
  • Subject: [mg96693] Re: spatial finite differences in two dimensions (something like
  • From: "andre.robin3" <andre.robin3 at wanadoo.fr>
  • Date: Sat, 21 Feb 2009 19:37:55 -0500 (EST)
  • References: <gnm1pp$hht$1@smc.vnet.net>

Sorry, in my previous message, I didn't see that you are interested in
the 2D case.

Mathematica gives the coefficient only for the 1D cases.

Nevertheless the documentation explains how to contruct a 2D
approximation with the coefficients of the 1D case. It gives a
the example of the 2D Laplacian.

"kem" <kemelmi at gmail.com> a écrit dans le message de news:
gnm1pp$hht$1 at smc.vnet.net...
> Hi,
>
> Is there a possibility in mathematica to get the coefficients or
> formula for approximation of spatial derivatives with finite
> differences. And, to get these formulas also for different orders of
> approximation?
>
> Specifically the function UFDWeights gives the coefficients for the 1D
> case,
>
> I need the same for the 2D case: partial derivatives:
>
> f_x, f_y, f_xy,f_xx,_fyy
>
>
>
> Thank you
>
>




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