eigs — Symmetric Eigen Decomposition
eigs with a single square argument matrix computes that matrix's
eigenvectors and eigenvalues. The results are returned as a list with
elements val and vec which are the eigenvalues and
right eigenvectors respectively. In general, these will be
complex quantities.
eigs with two arguments computes the eigenvectors and
eigenvalues of the real generalized symmetric ( or complex generalized
Hermitian) definite eigenproblem. The eigenvalues and eigenvectors are
returned in a list as for the first form. If the two arguments are
A and B, the eigenproblem is defined by
Ax = λBx
This routine forces use of the symmetric eigensolver — no checking
is done.
Subsections