Covering some basic topics I haven't seen elsewhere on Cody.
Return the class of the input variable.
Which doors are open?
Whether the input is vector?
Duplicate each element of a vector.
Set the array elements whose value is 13 to 0
Back to basics 5 - Clipboard
Back to basics 13 - Input variables
Back to basics 4 - Search Path
Back to basics 21 - Matrix replicating
Back to basics 8 - Matrix Diagonals
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