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 Nov 27 awarded Popular Question 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 revised How to visualize a 3D scalar function? require static plot Apr 4 comment Is there a symbol for “unitless”? @zhermes, If A = 10 m, then A/m = 10. Apr 4 asked How to visualize a 3D scalar function? 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. Nov 19 awarded Editor Nov 19 revised How does a mobile phone vibrate without any external force? s/fraction/friction/ Nov 19 suggested approved edit on How does a mobile phone vibrate without any external force? Oct 11 accepted Numerical software to manipulate a light beam in its plane wave representation? Oct 11 awarded Scholar Oct 11 awarded Benefactor Oct 9 awarded Promoter 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. Oct 6 awarded Student Oct 6 asked Numerical software to manipulate a light beam in its plane wave representation? 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. Sep 18 awarded Supporter