QARPACK

QARPACK is short for Quadratic Arnoldi Package. It is a Matlab Toolbox for solution of large sparse quadratic and more general nonlinear eigenvalue problems.

Version v.2.1:

What's new:

• Bug fixes in treatment of multiple eigenvalues in nra solver.

• QARPACK tarball

• QARPACK User's Guide

Version v.2.0:

What's new:

• The nonlinear solver nra now supports problems with multiple eigenvalues.

• QARPACK tarball

• QARPACK User's Guide

Version v.1.9:

What's new:

• Solver for general nonlinear eigenvalue problems satisfying variational principle or with dominating real or imaginary part.

• We renamed the quadratic solver in version v.1.0 from nra to qra, nra is now the general nonlinear solver.

• QARPACK tarball

• QARPACK User's Guide

Version v.1.0:

• QARPACK tarball

• QARPACK User's Guide

If you have queries about the code or if you have problems using the package drop me an email.