Just find the number of columns of the given matrix.
x = [1 2
y = 2
Maby this one needs some more test suites ;)
improve test suit
Maybe more test cases here? ;-)
Swap the first and last columns
Energy of a photon
Generate a random matrix A of (1,-1)
Swap two numbers
Concatenate two strings
Create the following sequence : 0 1 1 4 9 25 64 169 ...
Convert a number to its Roman representation
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