What you're looking for is not called the "characteristics equation", but the characteristic polynomial.
More test cases, please. ;-)
middleAsColumn: Return all but first and last element as a column vector
Getting the indices from a matrice
Basics: 'Find the eigenvalues of given matrix
Make a 1 hot vector
Sum of series I
Find out magnitude of vector
Generate vector according to sign of vector
MATLAB Basic: rounding
MATLAB Basic: rounding II
Delete 2nd and 5th column of Given 6*6 matrix
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