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Gradient of a List

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  

How can I solve this using Mathematica?

Thanks in advance

Olalla, Bilbao UPV/EHU

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