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• W2237392388 abstract "We study distributed network flows as solvers in continuous time for the linear algebraic equation $mathbf{z}=mathbf{H}mathbf{y}$. Each node $i$ has access to a row $mathbf{h}_i^{rm T}$ of the matrix $mathbf{H}$ and the corresponding entry $z_i$ in the vector $mathbf{z}$. The first consensus + projection flow under investigation consists of two terms, one from standard consensus dynamics and the other contributing to projection onto each affine subspace specified by the $mathbf{h}_i$ and $z_i$. The second projection consensus flow on the other hand simply replaces the relative state feedback in consensus dynamics with projected relative state feedback. Without dwell-time assumption on switching graphs as well as without positively lower bounded assumption on arc weights, we prove that all node states converge to a common solution of the linear algebraic equation, if there is any. The convergence is global for the consensus + projection flow while local for the projection consensus flow in the sense that the initial values must lie on the affine subspaces. If the linear equation has no exact solutions, we show that the node states can converge to a ball around the least squares solution whose radius can be made arbitrarily small through selecting a sufficiently large gain for the consensus + projection flow under fixed bidirectional graphs. Semi-global convergence to approximate least squares solutions is demonstrated for general switching directed graphs under suitable conditions. It is also shown that the projection consensus flow drives the average of the node states to the least squares solution with complete graph. Numerical examples are provided as illustrations of the established results." @default.
• W2237392388 created "2016-06-24" @default.
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• W2237392388 date "2015-10-17" @default.
• W2237392388 modified "2023-09-23" @default.
• W2237392388 title "Network Flows that Solve Linear Equations" @default.
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• W2237392388 doi "https://doi.org/10.48550/arxiv.1510.05176" @default.
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