What you're looking for is not called the "characteristics equation", but the characteristic polynomial.
More test cases, please. ;-)
How to find the position of an element in a vector without using the find function
Number of 1s in a binary string
Sum the 'edge' values of a matrix
Matlab Basics - Absolute Value
Converter temp 0 to 200 degree C to 4 to 20mA
Find out base of following arithmetic operation
Check that number is whole number
Delete 2nd and 5th column of Given 6*6 matrix
Add two different item as shown in example
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