Structured EigTool
Structured singular values and pseudospectra play an important role in assessing the properties of a linear system under structured perturbations. Structured Eigtool is a free Matlab interface for plotting structured pseudospectra. In particular, it supports the computation of real, skew-symmetric, Hermitian and Hamiltonian pseudospectra. Structured EigTool is heavily based on the EigTool [1] software package for plotting unstructured pseudospectra and inherits much of its interface.
Structured pseudospectra examples
Real pseudospectrum of the Demmel matrix |
Skew-symmetric pseudospectrum of the Rump matrix |
Download Structured Eigtool
seigtool.tar.gz, seigtool.zip (beta version, August 2009)This code is research code. If you find bugs, please let us know. If you publish a research paper using this code, we will appreciate if you cite the paper [3] describing our implementation.
References
- T. G. Wright, Eigtool, http://www.comlab.ox.ac.uk/pseudospectra/eigtool, 2002.
- M. Karow, mu-values and spectral value sets for linear perturbation classes defined by a scalar product, submitted, 2007.
- M. Karow, E. Kokiopoulou and D. Kressner, On the computation of structured singular values and pseudospectra, submitted, August, 2009.