Let vi and vj represent any two row vectors of the matrix in (17). The angle between them cos(θiv,j) = vi · vj vi vj u1(di) u1(dj) + . . . + u(ndui) u(nduj) + u1(di) u1(dj) + . . . + un(dui) un(duj) = ∆u + ∆u2 2 . (19) Note that the angle ...
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