DikobrAz
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Next privilege 250 Rep.
 Apr 17 accepted Derivative of scalar function with respect to matrix with vectors involved Apr 17 comment Derivative of scalar function with respect to matrix with vectors involved @CarlHeckman I've already studied cookbook and did a lot of matrix calculus in the past, yet I don't see pretty solution. Apr 17 asked Derivative of scalar function with respect to matrix with vectors involved Mar 10 accepted Efficient low rank matrix-vector multiplication Mar 10 comment Efficient low rank matrix-vector multiplication I see, thank you for clarification. Mar 9 comment Efficient low rank matrix-vector multiplication Or has any other structure with O(N) non-zero elements. Mar 9 comment Efficient low rank matrix-vector multiplication How can I compute product in linear time using SVD? I can multiply NxN matrix by Nx1 vector in O(N) only if it is diagonal/band matrix. Mar 9 comment Efficient low rank matrix-vector multiplication @NickAlger just theoretically, isn't there an automatic/systematic way to find rank-2 expansion. Maybe looking at this expansion will help to find efficient way of multiplication. Mar 9 awarded Editor Mar 9 revised Efficient low rank matrix-vector multiplication matrix is not orthogonal Mar 9 comment Efficient low rank matrix-vector multiplication @augurar you right, I've mixed different questions. Mar 8 asked Efficient low rank matrix-vector multiplication Nov 14 asked abstract optimization problem Feb 27 comment Find the point in a sub-space defined by linear constraints closer to an external point Just using linearly constrained quadratic programming to find $P_0$ isn't an option? Feb 27 awarded Scholar Feb 27 comment Probability that a random n-digit sequence has specific m-digit subsequence Thank you! I still can't figure it out, but I've written small program to compare results and it seems to be correct :) Feb 27 accepted Probability that a random n-digit sequence has specific m-digit subsequence Feb 27 awarded Supporter Feb 26 awarded Student Feb 26 asked Probability that a random n-digit sequence has specific m-digit subsequence