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Wilkinson matrix : ウィキペディア英語版
Wilkinson matrix
In linear algebra, Wilkinson matrices are symmetric, tridiagonal, order-''N'' matrices with pairs of nearly, but not exactly, equal eigenvalues. It is named after the British mathematician James H. Wilkinson. For ''N'' = 7, the Wilkinson matrix is given by
:\begin
3 & 1 & 0 & 0 & 0 & 0 & 0 \\
1 & 2 & 1 & 0 & 0 & 0 & 0 \\
0 & 1 & 1 & 1 & 0 & 0 & 0 \\
0 & 0 & 1 & 0 & 1 & 0 & 0 \\
0 & 0 & 0 & 1 & 1 & 1 & 0 \\
0 & 0 & 0 & 0 & 1 & 2 & 1 \\
0 & 0 & 0 & 0 & 0 & 1 & 3 \\
\end.
Wilkinson matrices have applications in many fields, including scientific computing, numerical linear algebra, and signal processing.
==References==



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