运用MATLAB求取结构的特征值以及相对应向量，其中小曲了刚度矩阵和质量矩阵中对角线为零的选项，消除了矩阵的奇异性-Use MATLAB to strike the structure and the corresponding eigenvalues 瘠攀挀琀漀爀, which ditty stiffness and mass matrices in the diagonal zero option, eliminating the singularity of the matrix

利用此函数可以在最小二乘意义上解决非线性曲线拟合（数据 拟合）问题。也就是说，给定输入数据xdata，以及观测的输出数据ydata，找到系数x，使 得函数F(x，xdata)能够最好的拟合向量值-MLS method not only can be applied for the purpose of curve (or surface) fitting, but also curve (or surface) interpolation when compactly supp

Romberg积分通常要求被积函数在积分区间上没有奇点。-Usually require Romberg integral integrand no singularity in the integral interval.