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!