Computes selected eigenvalues, and optionally, eigenvectors of a real
symmetric tridiagonal matrix. Eigenvalues are computed by the dqds
algorithm, and eigenvectors are computed from various "good" LDL^T
representations (also known as Relatively Robust Representations).
Computes selected eigenvalues, and optionally, eigenvectors of a real symmetric tridiagonal matrix. Eigenvalues are computed by the dqds algorithm, and eigenvectors are computed from various "good" LDL^T representations (also known as Relatively Robust Representations).