考虑微分方程在如下步长分布采用向前Eular、向后Eular，梯形公式、改进Eular和四阶龙格库塔方法计算近似值-procedure of approximate error using matlab

简介龙贝格求积公式也称为逐次分半加速法。它是在梯形公式、辛卜生公式和柯特斯公式之间的关系的基础上，构造出一种加速计算积分的方法。-Introduction Romberg quadrature formula is also known as successive half acceleration method. It is the trapezoidal formula, formulas and Cotes formulas Xinbo students based on the rela