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function Y = es2(X, n) %Y = ES2(X, n) symmetric extension of a matrix on all borders % % X - input matrix % n - number of rows/columns to extend % % Y - extended matrix % (Oliver Rockinger 16.08.99) [z s] = size(X); Y = zeros(z+2*n, s+2*n); Y(n+1:n+z,n:-1:1) = X(:,2:1:n+1); Y(n+1:n+z,n+1:1:n+s) = X; Y(n+1:n+z,n+s+1:1:s+2*n) = X(:,s-1:-1:s-n); Y(n:-1:1,n+1:s+n) = X(2:1:n+1,:); Y(n+z+1:1:z+2*n,n+1:s+n) = X(z-1:-1:z-n,:);