Given the vector A, return B in which all numbers in A are doubling. So for:
A = [ 1 5 8 ]
B = [ 1 1 5 5 8 8 ]
Word Counting and Indexing
Create a cell array out of a struct
Rotate input square matrix 90 degrees CCW without rot90
Create a vector whose elements depend on the previous element
Output any real number that is neither positive nor negative
Divisors of an integer
Solving a quadratic equation
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