Simple but fun
I'm not sure this would work if there is a 0 in x...
Rotate input square matrix 90 degrees CCW without rot90
Return 'on' or 'off'
CONVERT TAN TO SIN
Is it a number?
07 - Common functions and indexing 1
find the 'M'
true or false
Sum the rows
Replace all odd numbers with NaN
Make an identity matrix whose diagonal elements are 1:n
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