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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