What you're looking for is not called the "characteristics equation", but the characteristic polynomial.
More test cases, please. ;-)
Number of 1s in the Binary Representation of a Number
select the primes of a vector
Area of a circle
Find the 9's Complement
Rotate a matrix for 180 degree
Find out magnitude of vector
Find out sum of all elements of given Matrix
Create Vector containing following elements
calculate interest saved because of reduction of interest rate
MATLAB Basic: rounding
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