Description: In the use of Runge- Kutta (RK) methods for continuous system for digital simulation, in order to guarantee the stability of numerical calculation and simulation results have sufficient accuracy, usually variable step strategy. In order to effectively solve variable step simulation process, the output nodes and computing nodes does not correspond to the problem, the text in the previous work on the basis of a large stable region for the fourth-order RK formula right. The formula on the right side not to increase the differential equations to calculate the number of functions under the premise can be given integral step in any point on the numerical solution, which has a greater application value. Simulation results show that the formula is feasible and effective.
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