Given the radius x, y would be the area of a circle.
Pi = 3.1416
Make a run-length companion vector
matrix of natural number
Matrix of almost all zeros, except for main diagonal
Given the variable x as your input, multiply it by four, then divide it by two. Then put the result in y.
Square root of a number
If you have matrix A, create matrix B using matrix A as an "element"
Vector with a repeated entry
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