Coefficient of the characteristic polynomial

In some cases it may be difficult to obtain the analytical form of the coefficients of the characteristic polynomial of a matrix. The following procedure allows to compute these coefficients even if the matrix is an interval matrix:

 
INTERVAL_VECTOR Coeff_CharPoly(int Size,INTERVAL_MATRIX &A)

where Size is the dimension of the matrix and A the matrix. This procedures returns the coefficients in an interval vector $C$ and the polynomial is $\sum C(i)x^{i-1}$.