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precal_cov_2d.m
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precal_cov_2d.m
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% precal_cov_2d : Precalculate 2D stationary covariance matrix
%
% CALL :
% [cov]=precal_cov_2d(nx,ny,dx,dy,V,options);
%
% See also precal_cov
%
%
function [cov]=precal_cov_2d(nx,ny,dx,dy,V,options);
options.null='';
x=[1:1:nx].*dx;
y=[1:1:ny].*dy;
[xx,yy]=meshgrid(x,y);
pos1=[xx(:) yy(:)];
cov_small=precal_cov(pos1(1:ny,:),pos1,V,options);
n_est=size(pos1,1);
cov=zeros(n_est,n_est);
%% UPPER TRIANGLE
for ix=1:nx;
iy0=(ix-1)*ny;
ix0=(ix-1)*ny;
%if ix==2;keyboard;keyboard;end
x_arr=(ix0+1):n_est;
cov((1:ny)+iy0,x_arr)=cov_small(:,1:length(x_arr));
end
%% LOWER TRIANGLE
for ix1=2:nx
for ix2=1:ix1;
ix1_0 = (ix1-1)*ny;
ix2_0 = (ix2-1)*ny;
x1 = (1:ny)+ix1_0;
x2 = (1:ny)+ix2_0;
cov(x1,x2)=cov(x2,x1)';
end
end