Additional test cases have been added.
How to find the position of an element in a vector without using the find function
Sum the numbers on the main diagonal
Find the area of the four walls
Matlab Basics - Pick out parts of a vector
Check if inputted variable is a string or a number
Find the index of the lowest number in a matrix
Find the sum of the largest two elements in a vector
Vector indexing: lower than mean
Simple String Concatenation
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