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 Apr 4 comment How to visualize a 3D scalar function? Nice examples. I was looking for something like your rotatable 2D density plot, which does not rely on user interaction, e.g. 2 or 3 views from different angles combined. Apr 4 comment Is there a symbol for “unitless”? @zhermes, If A = 10 m, then A/m = 10. Feb 8 comment Can a photon be emitted with a wavelength > 299,792,458 meters, and would this violate c? The expression $c<\lambda$ is meaningless since $c$ and $\lambda$ have different units. Oct 6 comment Numerical software to manipulate a light beam in its plane wave representation? I'm aware of numpy, scipy, matplotlib and they are suitable for my purpose. However, that was not my question. I wonder, whether there is a framework built upon numpy and friends that "knows" something about optics. Sep 18 comment Uses of vectors in real life Vectors and Vector Spaces are simple, beautiful and as you can see in the answers useful. The position and all related quantities (velocity, momentum, acceleration, force) are vectors. The state of a physical system (both QM and classical) is a vector in a vector space. The solution of a system of (differential) linear equations is a vector. If you study physics, you will soon realize that most everything is a vector.