please complete the above using Matlab.

1. The general form of a three-dimensional stress field in a continuum material is represented in the standard coordinate system by a 3x3 matrix xx xz yz zz where the diagonal terms represent tensile or compressive stresses and the off- diagonal terms represent shear stresses. The principal stresses , 2, and 3 are defined as the eigenvalues of , which correspond to the roots of the characteristic equation c(A) = 0, where c(A) = det(o-AI) is the characteristic polynomial and of o, and I is the 3x3 identity matrix. (a) Write a program that takes the entries of a three-dimensional stress field as input and outputs ao, al, and a2, the coefficients of the characteristic