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
give nth decimal place of pi
Back to basics 9 - Indexed References
Detect a number and replace with two NaN's
07 - Common functions and indexing 5
Back to basics - mean of corner elements of a matrix
Derivative of polynomial
Altitude of locations on the earth
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