Lagrange插值+Newton插值+分段线性插值+复合梯形公式求定积分+列主元高斯+牛顿迭代+数据拟合+线性方程组迭代+++追赶法(1)

用复合梯形公式逐步分半算法（步长自动选择），计算∫ x/sinxdx,精度要求为e=10-5,-Composite trapezoid formula and gradually half algorithms (step automatic selection), calculate ∫ x/sinxdx, accuracy requirements for e = 10-5,

几个数值算法,二分法,分段线性插值,复合梯形法()

复化求积公式(composite integration rule )是一类重要的求积公式。指将求积区间分为m个子区间，对每个子区间应用同一求积公式，所得到的复合数值积分公式。(The complex quadrature formula is a kind of important quadrature formula. The formula of complex numerical integration is obtained by dividing the quadrature int