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.
Find all elements less than 0 or greater than 10 and replace them with NaN
Prime factor digits
The sum of the numbers in the vector
Multiply by 3
Create the following sequence : 0 1 1 4 9 25 64 169 ...
Concatenate two strings
Find the square of the sum of the digits of a number
Find the area of the four walls
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