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// PG (608)
A = [1 2 3;2 3 4;3 4 5]
lam = spec(A)' // Eigen values of A
lam1 = lam(1,3)
lam2 = lam(1,1)
lam3 = lam(1,2)
// Theoretical ratio of convergence
lam2/lam1
// After extrapolating, we get
lame1 = 9.6234814
// Error:
lam1-lame1
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