MATLAB Functions | Help Desk |
wilkinson
Wilkinson's eigenvalue test matrix
W = wilkinson(n)
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.
wilkinson(7)
is
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 3The 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.
eig
Eigenvalues and eigenvectors
gallery
Test matrices
pascal
Pascal matrix