a graphical tool for nonsymmetric eigenproblems

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About Eigtool

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).


If you wish to cite this software, please use:

Thomas G. Wright. EigTool. http://www.comlab.ox.ac.uk/pseudospectra/eigtool/, 2002.

Related Publications

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


This software package is delivered "as is". The author and maintainer make no representation or warranties, express or implied, with respect to the software package. In no event shall the author or maintainer be liable for loss of profits, loss of savings, or direct, indirect, special, consequential, or incidental damages.

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