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计算多项式的加减乘除求值求根 在codeblocks中c++11标准下编译通过(caculate the polynominal use codeblocks in c++ 11 standard)

fft变换后求出主频，FFT transform to calculate frequency

随机有限元理论教材，是学习随机有限元及可靠度理论的不错东东 (Stochastic finite element theory of teaching materials, are studying stochastic finite element and reliability theory is true Dongdong)

求解线性方程组，高斯消去法精确求解出任意个方程组的解，(Solving linear equations, Gaussian elimination exact solution,)

说明：  二维河道水动力模型；matlab 迭代程序；水质模拟(Two dimensional river hydrodynamic model; MATLAB iterative program; water quality simulation)

说明：  一种数值方法，用于生成样本点。样本点之间具有相关性小，分布均匀的特点。(A numerical method for generating sample points. The sample points have the characteristics of small correlation and uniform distribution.)

利用拉格朗日松弛法求解机组组合问题，考虑领域搜索的随机性(Using Lagrangian relaxation method to solve the unit combination problem, considering the randomness of the search field)

Mathematica计算基于力平衡变截面梁单元的质量和刚度矩阵(2D force-based finite element mathemaica)

包括牛顿法，阻尼牛顿法，变尺度算法，最速下降法的优化算法程序。(Newton' s method, damped Newton method, variable metric algorithm, the steepest descent method optimization algorithm.)

this document contains an explanation of mathematical functions