surface of a spherical planet
Back to basics 19 - character types
Generate a vector like 1,2,2,3,3,3,4,4,4,4
Generate a random matrix A of (1,-1)
Average of corner elements of a matrix (★★)
Generate n equally spaced "intervals" between -x and x (★)
Create a vector of n alternating ones and minus ones (★★)
Variance computation (★)
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