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Re: Gradient of a List

  • To: mathgroup at smc.vnet.net
  • Subject: [mg82566] Re: Gradient of a List
  • From: "David Park" <djmpark at comcast.net>
  • Date: Thu, 25 Oct 2007 06:01:26 -0400 (EDT)
  • References: <ffn0uv$60k$1@smc.vnet.net>

Use Interpolation on your data to create an InterpolatingFunction and then 
you can apply a gradient operator to that.

-- 
David Park
djmpark at comcast.net
http://home.comcast.net/~djmpark/


"olalla" <operez009 at ikasle.ehu.es> wrote in message 
news:ffn0uv$60k$1 at smc.vnet.net...
> Hi everybody,
>
> Does anybody know how can I get the "gradient" of a list of points?
>
> My real problem is:
>
> I have a scalar field previously obtained numerically that for a
> given point (xi,yi) takes a value f(xi,yi). What I want to do is an
> estimation of the gradient of this scalar field BUT I haven't got any
> analytical function that expresses  my field so I can't use the Grad
> function.
>
> How can I solve this using Mathematica?
>
> Thanks in advance
>
> Olalla, Bilbao UPV/EHU
> 



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