Given an input variable x, output a variable y that is equal in value to x.
Input x = 1
Output y is 1
Input x = 5
Output y is 5
Not as simple as it seems.
Test for balanced parentheses
Swap the input arguments
07 - Common functions and indexing 3
07 - Common functions and indexing 5
Replace every 3rd element in a vector with 4
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