Questions tagged [matrix-product]

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the largest element of a matrix product

Given two matrices, I'm interested in finding the largest element of their product. I wonder if it's possible to do it significantly faster than the matrix multiplication the solution seems to require?...
4
votes
0answers
114 views

Complexity of a variant of matrix multiplication

Assume a family of $n\times n$ integer matrices $\{M_a \mid a\in A\}$ for some finite set $A$, I want to decide whether for given vectors $\alpha$ and $\beta$, $\alpha M(w) \beta=0$ for all $w\in A^{...
4
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603 views

What about apply maxplus algebra for all-pairs shortest paths?

I didn't find deep informations on Wikipedia about all-pairs shortest path, in particular I do not know what is the best algorithm to solve this problem beyond Floyd-Warshall's one, then I do not know ...
4
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225 views

Question on size of words in Vandermonde Matrix - Vector multiplication complexity

I am trying to understand how word sizes in a problem affects complexity. The question could be a simple technicality I am trying to clarify since I am not from mainstream CS. Let $V$ be an $n \times ...
3
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0answers
136 views

Dynamic matrix-matrix multiplication

Suppose A and B are initial Boolean matrices. Let C = A*B. Suppose one can perform the sequence of the next operations: "set A[i,j] = 1", "set B[i,j] = 1". The result of each ...
3
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49 views

Best complexity bound for parallel matrix-vector product?

I'm looking for the best known complexity (and a bound for the number of processors invoved) to do the calculation of a $(n,n)$ matrix-vector product. Thank you
2
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0answers
129 views

Trying to find Warren D. Smith's Matrix Multiplication article

One of my favorite articles on the complexity of matrix multiplication has gone dark. Warren Smith, Fast Matrix Algorithms And Multiplication Formulae, https://math.cst.temple.edu/~wds/matgrant.ps ...
0
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100 views

Is there a diagonal matrix D such that DMD is SDD, where M is SPD matrix

Let $M$ be symmetric and positive definite matrix (SPD). It is known [1] that if $M$ is SPD and in addition satisfies $M_{ij}\leq 0$, for $i\neq j$ (called M-matrix) then there is a positive ...