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C++ API

 Sparse operator for a gradient.

 [Dx1,Dx2,...,Dxn] = sparse_gradient(mask,pmn)

 Form the gradient using finite differences in all n-dimensions

 Input:
   mask: binary mask delimiting the domain. 1 is inside and 0 outside.
         For oceanographic application, this is the land-sea mask.
 
   pmn: scale factor of the grid. 

 Output:
   Dx1,Dx2,...,Dxn: sparce matrix represeting a gradient along 
     different dimensions 

Package: divand