Make a square matrix with this shape. For n=4
1 1 0 0
1 0 1 0
0 1 0 1
0 0 1 1
Back to basics 22 - Rotate a matrix
Set some matrix elements to zero
Detect a number and replace with two NaN's
Simple equation: Annual salary
Matrix to column conversion
Derivative of polynomial
Altitude of locations on the earth
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