Tell me the slope
What is the distance from point P(x,y) to the line Ax + By + C = 0?
Implement simple rotation cypher
Doubling elements in a vector
Triangle Numbers (★★)
Sum of terms in a series 1 (★★★)
Vector of digits (★★)
Variance computation (★★★)
Matrix indexing with two vectors of indices (★★)
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