The problem is really to just reverse a row vector. A row vector happens to be a matrix, but so does a column vector, and two or more dimensional matrices. Saying, "reverse a matrix" is ambiguous.
Distance walked 2D
Arrange Vector in descending order
Flip the main diagonal of a matrix
Switch matrix to a column vector
Remove the positive integers.
Convert a number to its Roman representation
Create the following sequence : 0 1 1 4 9 25 64 169 ...
Find the dimensions of a matrix
Find the square of the sum of the digits of a number
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