Documentation of sph_grad

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Function Synopsis

[ x, y ] = sph_grad ( z, ax, ay ) ;

Help text

 function [ x, y ] = sph_grad ( z, ax, ay ) ;

 assume ax and ay specified in degree;

 see also : sph_grad, sph_div, sph_curl, sph_gradx, sph_grady

Cross-Reference Information

Listing of function sph_grad

function [ x, y ] = sph_grad ( z, ax, ay ) ;

  global RADUS RADIAN DEGREE

  [ny,nx] = size(z);
  if ( nx*ny ~= length(ay)*length(ax) );
    error ( 'dimension mismatch' );
  else
    ax = ax(:)'; ay = ay(:)';
  end;

%--------------------------------------------------------

  rx = ax * RADIAN; ry = ay * RADIAN;

  x = sph_gradx ( z, rx, ry );
  y = sph_grady ( z, rx, ry, 0 );