A block-matrix reformulation reduces the implicit solve in any isospectral symplectic Runge-Kutta method to a single equation, making high-order integrators practical.
Mathematics of computation 66(220), 1461–1486 (1997)
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Efficient implementation of high-order isospectral symplectic Runge-Kutta schemes
A block-matrix reformulation reduces the implicit solve in any isospectral symplectic Runge-Kutta method to a single equation, making high-order integrators practical.