The library is currently in the early stages of development. There are many things to do, a list of the things I am working on can be found on the PSFUN project.
Parts of code that can definitely be useful are:
- methods for calculating matrix functions on small-format matrices and in dense storage. If you have implemented any of this in an open source way, let us know and we can discuss an integration,
- quadrature formulas for the approximation of Cauchy integrals.
If you have other ideas or want to collaborate, I'm an email away.