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Compute only a few entries of a big matrix product
Suppose I have a tall matrix x (say 10000 by 10), and a collection of indices {N1, N2, ..... Nk} where each Ni is a subset of {1...
fast 3 Jahre vor | 1 Antwort | 0
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Fast matrix product where one matrix is sparse [Ed. and diagonal] and the other is a Kronecker product
Suppose I want to calculate something like A*(Kron(B,eye(n))), where A is a large diagonal matrix whose main diagonal is also sp...
fast 4 Jahre vor | 1 Antwort | 1
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Quickly extract the diagonal blocks of matrix product
Suppose I have a tall n by r matrix X (n as large as 10^4 and r=4), and I also have partitions of 1:n by small subsets ({1,2},{3...
fast 4 Jahre vor | 1 Antwort | 0
