Papers › Computing the matrix exponential with the double exponential formula
Computing the matrix exponential with the double exponential formula
Fuminori Tatsuoka, Tomohiro Sogabe, Tomoya Kemmochi, Shao-Liang Zhang
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This paper considers the computation of the matrix exponential eᴬ with numerical quadrature. Although several quadrature-based algorithms have been proposed, they focus on (near) Hermitian matrices. In order to deal with non-Hermitian matrices, we use another integral representation including an oscillatory term and consider applying the double exponential (DE) formula specialized to Fourier integrals. The DE formula transforms the given integral into another integral whose interval is infinite, and therefore it is necessary to truncate the infinite interval. In this paper, to utilize the DE formula, we analyze the truncation error and propose two algorithms. The first one approximates eᴬ with the fixed mesh size which is a parameter in the DE formula affecting the accuracy. Second one computes eᴬ based on the first one with automatic selection of the mesh size depending on the given error tolerance.
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