Christian Rau
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 Dec 8 awarded Student Dec 8 comment Matrices for which $\mathbf{A}^{-1}=-\mathbf{A}$ @AlexanderThumm Of course, as simple as it can be, me stupid! But what about more general matrices? Dec 8 asked Matrices for which $\mathbf{A}^{-1}=-\mathbf{A}$ Sep 17 awarded Enthusiast Sep 13 revised Jacobian matrix of the Rodrigues' formula (exponential map) added 24 characters in body Sep 13 answered Optimizing Cholesky factorization for multiple sparse matrices with same nonzero pattern Sep 13 answered Jacobian matrix of the Rodrigues' formula (exponential map) Sep 7 awarded Autobiographer Sep 4 revised Finding the intersection point of many lines in 3D (point closest to all lines) Ported to latex for a more math appropriate style Sep 4 suggested approved edit on Finding the intersection point of many lines in 3D (point closest to all lines) Sep 4 awarded Commentator Sep 4 comment Finding the intersection point of many lines in 3D (point closest to all lines) +1 I tried to work on the distance equation and derive it, but I completely forgot about Lagrange identity. Perfectly simple now. Sep 4 comment Finding the intersection point of many lines in 3D (point closest to all lines) Are you sure your computation of the distance is correct? The dot product computes the cos of the angle, whose sin we want, therefore we need the cross product (or rather it's norm) instead of the dot product. Sep 3 comment Why composite transformations are multiplied to the right side? @xEnOn Just to clarify, your example was badly-chosen, as OpenGL uses column vectors. But maybe you know this yourself and it was just a thought experiment. Sep 2 answered Orthogonal matrix over cross product Sep 1 revised How to calculate the x/y coordinate of F in this diagram (geometry) edited body Aug 31 revised How to calculate the x/y coordinate of F in this diagram (geometry) edited body Aug 31 answered How to calculate the x/y coordinate of F in this diagram (geometry) Aug 29 revised Quaternion for an object that to point in a direction deleted 265 characters in body Aug 29 revised Quaternion for an object that to point in a direction added 265 characters in body