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.
sum of non-primes
What number has this problem?
Create an index-powered vector
Is this triangle right-angled?
Find the area of the four walls
Convert a number to its Roman representation
Find the dimensions of a matrix
Find the square of the sum of the digits of a number
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