Procedures for computing vector harmonic analyses via Spherepack.
procedure vhaec( u : float v : float, br : float, bi : float, cr : float, ci : float ) procedure vhagc( u : float, v : float, br : float, bi : float, cr : float, ci : float )
Note: If you have version 4.1 of NCL, these procedures will not work with arrays greater than two dimensions. In order to use arrays with more than two dimensions, you need to run version 4.1.1 of NCL. If your site is licensed for version 4.1, then you can get version 4.1.1 for free. To get version 4.1.1 of NCAR Graphics software, please contact your site representative. If you don't know who your site representative is, then send email to email@example.com or call (303) 497-1201.vhaec and vhagc both perform the vector spherical harmonic analysis on the vector field u and v and store the results in the arrays br, bi, cr, and ci. vhaec operates on an equal (fixed) grid, and vhagc operates on a Gaussian grid.
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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