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esmf_regrid.m
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esmf_regrid.m
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%==========================================================================
% matFVCOM package
% Interpolate in ESMF style
%
% input :
% src_field --- source varaible
% weight --- read via esmf_read_weight
% *Dims --- destination variable size {[]}
% **Extrap --- invoke extrapolation
% output :
% dst_field --- destination variable
%
% Siqi Li, SMAST
% 2023-03-01
%
% Updates:
%
%==========================================================================
function dst_field = esmf_regrid(src_field, weight, varargin)
varargin = read_varargin(varargin, {'Dims'}, {[]});
varargin = read_varargin2(varargin, {'Extrap'});
row = weight.row;
col = weight.col;
S = weight.S;
src_field = reshape(src_field, weight.n_a, []);
n = size(src_field, 2);
if (n>1)
error(['esmf_regrid does not support variables with the dimention ' ...
'of 3 or higher. Use loops instead. '])
end
% Initialize destination field to 0.0
dst_field = zeros(weight.n_b, 1);
% Apply weights
for i = 1 : weight.n_s
dst_field(row(i)) = dst_field(row(i)) + S(i)*src_field(col(i));
end
% Adjust destination field by fraction
dst_field = dst_field ./ weight.frac_b;
% Extrapolation
if ~isempty(Extrap)
dst_field(weight.out) = src_field(weight.out_id);
end
if ~isempty(Dims)
dst_field = reshape(dst_field, Dims);
end