You can enter the coefficients of a given characteristic equation to check the stability of the system.
This program addresses the cases of zero elements in the first column and zero rows.
The problem of zero element in the first column is solved by adding two more poles to the LHP. ( [old polynomial * (s^2+ n*s + m) ] this does not affect the stability of the system.) Some programs use 'eps'; it is not convenient in polynomials of higher orders.
In case of zero element,you will be asked to enter the coefficients of (s^2+ n*s + m). Be careful "n" & "m" must be positive.
Please let me know if there are any problems.