Sang-Gu Lee
Sungkyunkwan University, Matrix Lab.

Introduction

Gerschgorin Circle Theorem which is appeared in 1931, get a good result for the region of  eigenvalues, which is located in the circle that is drawed by the elements of matrix without complex computation for eigenvalue from n-dimensional square matrix. In this section, we will make a visualization for the region of eigenvalues and location of these using MATLAB and JAVA Applet on the Gerschgorin Circle Theorem.