Re: Calculating div/grad and vector

Assuming you are referring to a WRF grid, the answer is "no" to the
'div' and 'grad' functionality.

If the data had been global and on a rectilinear grid,
NCL's spherical harmonic functions could perform the 'div'
and 'grad' operations. Unfortunately, the spherical harmonic functions
can not be applied to a non-global or curviliner grids.

---
"Calculating a vector": Basic geometry? (w=>omega).
   vlen = sqrt( (u(1)-u(0))^2 + (v(1)-v(0))^2 + (w(1)-w(0))^2 )
   a is the angle between vlen and the x-axis
   b is the angle between vlen and the y-axis
   c is the angle between vlen and the z-axis
   a = acos((u(1)-u(0))/vlen)
   b = acos((v(1)-v(0))/vlen)
   c = acos((w(1)-w(0))/vlen)
On 6/25/12 5:39 PM, Soumik Basu wrote:
> Hi,
>
> I am trying to calculate some energy conversion terms and boundary flux
> for which I need to calculate divergence and gradient of some terms like
> div(T'u') and grad(T - T') . So is it possible to calculate this in NCL?
> Also I need vector wind so is there any function for calculating vector
> for example U which is a function of u,v,omega.
>
>
> Thanks,
> Soumik
>
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