龙格-库塔(Runge-Kutta)方法是一种在工程上应用广泛的高精度单步算法。由于此算法精度高，采取措施对误差进行抑制，所以其实现原理也较复杂。该算法是构建在数学支持的基础之上的。数值计算中经常用到，四阶龙格库塔经常被称为“RK4”或者就是“龙格库塔法”。-Runge- Kutta (Runge-Kutta) method is a widely used in engineering high-precision single-step algorithm. Due to the high accuracy of this algorithm, to take measures to suppress the error, so the realization of the principle is also more complicated. The algorithm is built on the basis of mathematical support. Often used in numerical calculations, fourth-order Runge-Kutta often referred to as　RK4　or just　Runge-Kutta method.