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).
Mario Berges (2022). Gershgorin Discs Plot (https://www.mathworks.com/matlabcentral/fileexchange/13989-gershgorin-discs-plot), MATLAB Central File Exchange. Retrieved .
MATLAB Release Compatibility
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