What you're looking for is not called the "characteristics equation", but the characteristic polynomial.
More test cases, please. ;-)
Rotate a Matrix by 90 degrees
Sum the 'edge' values of a matrix
Create Vector containing following elements
Determine the Anti-diagonal of a Magic Square
Add two hex numbers
Find out rooms, peak to peak, average for a square wave.
Element by element multiplication of two vectors
Convert Decimal Number to Hex number (including non integer value)
Add one raw in given matrix as shown in example
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