|MATLAB Function Reference|
Wilkinson's eigenvalue test matrix
W = wilkinson(n)
returns one of J. H. Wilkinson's eigenvalue test matrices. It is a symmetric, tridiagonal matrix with pairs of nearly, but not exactly, equal eigenvalues.
The most frequently used case is
wilkinson(21). Its two largest eigenvalues are both about 10.746; they agree to 14, but not to 15, decimal places.