W = wilkinson(n) returns one of J. H.
Wilkinson's n-by-n eigenvalue test matrices.
W is a symmetric, tridiagonal matrix with pairs of nearly
equal eigenvalues.
Compute a 7-by-7 Wilkinson eigenvalue test matrix. The most frequently used case is wilkinson(21), whose two largest eigenvalues are approximately 10.746. The eigenvalues agree to 14, but not 15, decimal places.
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