Make the following variable:
A 9x9 matrix of zeros, but with the following values on the main diagonal:
(Hint: use diag)
Remove NaN ?
Output any real number that is neither positive nor negative
Duplicate a character
01 - Scalar variables
05 - Vector Equations 1
03 - Matrix Variables 3
06 - Matrix Equations 2
02 - Vector Variables 3
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