Daniel@0: function r = regularizeMKLDOD(W, X, gradient)
Daniel@0: %
Daniel@0: % r = regularizeMKLDOD(W, X, gradient)
Daniel@0: %
Daniel@0: %
Daniel@0: 
Daniel@0:     [d,n,m] = size(X);
Daniel@0: 
Daniel@0:     if gradient
Daniel@0:         r = zeros(m,m,d);
Daniel@0:         for i = 1:m
Daniel@0:             r(i,i,:) = diag(X(:,:,i));
Daniel@0:             for j = (i+1):m
Daniel@0:                 r(i,j,:) = diag(X(:,:,i)) + diag(X(:,:,j));
Daniel@0:             end
Daniel@0:         end
Daniel@0:     else
Daniel@0:         r = 0;
Daniel@0:         for i = 1:m
Daniel@0:             r = r + squeeze(W(i,i,:))' * diag(X(:,:,i));
Daniel@0:             for j = (i+1):m
Daniel@0:                 r = r + squeeze(W(i,j,:))' * (diag(X(:,:,i)) + diag(X(:,:,j)));
Daniel@0:             end
Daniel@0:         end
Daniel@0:     end
Daniel@0: end