Make the following variable:
A 9x9 matrix of zeros, but with the following values on the main diagonal:
(Hint: use diag)
Getting logical indexes
Return 'on' or 'off'
Duplicate a character
03 - Matrix Variables 1
Divide by 4
03 - Matrix Variables 4
01 - Scalar variables
07 - Common functions and indexing 4
07 - Common functions and indexing 5
03 - Matrix Variables 5
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