Pseudospectra Quick Start
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Here are instructions to help you start computing pseudospectra right away using MATLAB®.

  • Download EigTool
    • Click here to download EigTool for Unix or Windows systems.
    • Follow the instructions to uncompress and install EigTool.
  • Start up MATLAB, and exectute the following command:
    • eigtool(gallery('grcar',32));
  • If all has gone as planned, you'll see the pseudospectra of a Grcar matrix of dimension 32, as shown below.
  • Experiment with the options in the interface: try a finer grid, zoom in for a closer look, or change the plotting options.
    When you're done with the Grcar matrix, try a matrix of your own!