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.
Filter AC, pass DC
Back to basics 21 - Matrix replicating
middleAsColumn: Return all but first and last element as a column vector
Given a 4x4 matrix, swap the two middle columns
Convert yards to feet
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