ATLAB Lecture 4 School of Mathematical Sciences Xiamen University http∥gdjpkc.xmu.edu.cr A 312 l10 p a= poly (A) computes the coefficients of the characteristic polynomial ofA 1.0e+003* 0.00100.01200.03802.0310 >>roots(p A) 168781 2.4391+10.6951 2.4391-10.695li We usually use eig to compute the eigenvalues of a matrix directly Lec4-5MATLAB Lecture 4  School of Mathematical Sciences Xiamen University  http://gdjpkc.xmu.edu.cn  Lec4­5  A =  ­4  3  12  ­17  ­11  0  1  12  3  >> p_A = poly(A) % computes the coefficients of the characteristic polynomial of A  ans =  1.0e+003 *  0.0010  0.0120 0.0380  2.0310  >> r=roots(p_A) r =  ­16.8781  2.4391 +10.6951i  2.4391 ­10.6951i  We usually use eig to compute the eigenvalues of a matrix directly