Abstract
A large scale nonsymmetric algebraic Riccati equation X C X − X E − A X + B = 0 arising in transport theory is considered, where the n × n coefficient matrices B,C are symmetric and low-ranked and A, E are rank one updates of nonsingular diagonal matrices. By introducing a balancing strategy and setting appropriate initial matrices carefully, we can simplify the large-scale structure-preserving doubling algorithm (SDA_ls) for this special equation. We give modified large-scale structure-preserving doubling algorithm, which can reduce the flop count of original SDA_ls by half. Numerical experiments illustrate the effectiveness of our method.
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Guo, PC. A modified large-scale structure-preserving doubling algorithm for a large-scale Riccati equation from transport theory. Numer Algor 71, 541–552 (2016). https://doi.org/10.1007/s11075-015-0008-4
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DOI: https://doi.org/10.1007/s11075-015-0008-4
Keywords
- Large-scale nonsymmetric algebraic Riccati equation
- Large-scale structure-preserving doubling algorithm
- Balancing strategy
- Appropriate initial matrices
- Transport theory