Return how many integer grid points there are inside a 3D sphere of radius r centred at (0,0,0) (including points on the edge).
Neither string operations nor interpolations are allowed!
Rotate a Matrix
Getting the indices from a vector
Create Volcano (or Atoll) martix. It is an extension of Bullseye matrix problem.
Put Two 1D matrices into one 1D matrix
Hexagonal Tiling Dots in a Circle
Edges of a n-dimensional Hypercube
Generalized Laguerre polynomials
Radial Zernike polynomials
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