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计算多边形(凸凹)面积。 欢迎批评指正(Calculating polygon (convex and concave) area. Welcome criticism)

模糊数学中典型的卡车倒车入库模拟仿真程序，充分利用了一定的经典的模糊规则，来实现卡车倒车的模拟(typical truck reversing the arsenal of simulation procedures and make full use of a certain classic fuzzy rules to achieve the reversal of simulated truck)

矩量法的fortran程序，忘了那本书的源码了(Method of Moments fortran program, forgot the source of the book)

用ANSYS软件命令流方式实现对于复合材料的分析(For composites analysis with ANSYS Software Command)

使用Y矩阵来综合得到耦合矩阵M中各元素的matlab源代码(The Y matrix to obtain an integrated coupling matrix M of each element matlab source code)

是一个基于Fortran语言计算 第一主应力 和 第三主应力 结构数值计算方便的代码(Fortran language is a calculation based on the first principal stress and the third principal stress code structure to facilitate numerical calculation)

单元刚度矩阵，用于计算三单元刚度矩阵，输出刚度矩阵(Element stiffness matrix is ​ ​ used to calculate the three-element stiffness matrix, the output stiffness matrix)

说明：  LDL分解。作为矩阵方程数值解法最基础的矩阵分解算法，LDL算法可以高效分解对称矩阵。(LDL decomposition. Numerical Solution of matrix equation as the most basic matrix factorization algorithm, LDL decomposition algorithm can be efficient symmetric matrix.)

实现贝叶斯最大后验概率计算，适合原理的研究，简单易懂。(To achieve the maximum a posteriori Bayesian probability, the principle of appropriate and easily understood.)

变系数/非线性微分方程的求解，包括原式及改变的式子。 (Variable coefficients/non-linear differential equations to solve, including the original style and formula changes.)