Given an array whose gradient is a vector function, compute its scalar function via Spherepack.
procedure igradsf( gzx : float, gzy : float, z : float ) procedure igradsg( gzx : float, gzy : float z : float )
Note: For the arrays whose last two dimensions are nlat x nlon, the rest of the dimensions (if any) are collectively referred to as nt. If the input/output arrays are just two dimensions, then nt can either be considered equal to 1 or nothing at all.
Arrays which have dimensions nt x nlat x nlon should not include the cyclic (wraparound) points when invoking the procedures and functions which use spherical harmonics (Spherepack).
For example, if an array x has dimensions nlat = 64 and nlon = 129, where the "129" represents the cyclic points, then the user should pass the data to the procedure/function via:
z = sample ( x([...],:,0:nlon-2) ) ; does not include cyclic points
1 : error in the specification of nlat
2 : error in the specification of nlon
4 : error in the specification of nt (jer only)
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