Gershgorin Discs Plot

This function plots the Gershgorin Discs for the matrix A passed as an argument. It will also plot t

This function plots the Gershgorin Discs for the matrix A passed as an argument. It will also plot the centers of such discs, and the actual eigenvalues of the matrix.

Partly inspired by Bill Driscoll's circle plotting script (http://www.dsprelated.com/groups/matlab/show/25.php).