Empty matrix: 1-by-0
use this as the input,and the output should be ''
require no appearance of '' and 'empty' method inside the function
Sum all integers from 1 to 2^n
Find the sum of the elements in the "second" diagonal
Given a 4x4 matrix, swap the two middle columns
Solving Quadratic Equations (Version 1)
Define the operators of function_handles
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