A row vector is not a matrix...
Not very clear problem, flip vertically? horizontally? elementwise?
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.
Select every other element of a vector
Test if two numbers have the same digits
Is it a number?
Switch matrix to a column vector
Determine the square root
Convert a number to its Roman representation
Concatenate two strings
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