What you're looking for is not called the "characteristics equation", but the characteristic polynomial.
More test cases, please. ;-)
First non-zero element in each column
Column norms of a matrix
Output any real number that is neither positive nor negative
Replace odd number in given matrix by zero
Calculate volume of box
Find out Harmonic mean.
Create Vector containing following elements
Find out base of following arithmetic operation
Flip the vector from right to left
Find out phase angle of second order system.
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