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EigTool is a free MATLAB package for computing pseudospectra of dense and sparse matrices. It also provides a graphical interface to MATLAB’s built-in eigs routine (ARPACK) for large-scale eigenvalue computations. EigTool was developed from 1999 – 2002 by Thomas G. Wright at the Oxford University Computing Laboratory, under the direction of Nick Trefethen. The software is presently maintained by Mark Embree (Rice University), to whom any bug reports or other suggestions should be addressed.

Download EigTool

Click here to download the software (version 2.1 (beta), 16 March 2009).

Related Publications

The following work describes some of the algorithms used within EigTool.

• L. N. Trefethen. Computation of pseudospectra. In Acta Numerica 1999, pp. 247-295, Cambridge University Press.
• L. N. Trefethen and M. Embree. Spectra and Pseudospectra: The Behavior of Nonnormal Matrices and Operators, Princeton University Press, Princeton, 2009.
• T. G. Wright and L. N. Trefethen. Large-scale computation of pseudospectra using ARPACK and eigs. SIAM J. Sci. Comp., 23(2) (2001) pp. 591-605.
• T. G. Wright and L. N. Trefethen. Pseudospectra of Rectangular Matrices. IMA J. Numer. Anal. 22(4) (2002) pp. 501-519.