Multivariate least squares fitting method of nonlinear equations, GPS and INS navigation program, Using a large number of finite element method to solve partial differential equations.

这是一个关于有限元的C++程序代码，其中包括线性，非线性，扩展有限元模块，等几何有限元模块(This is a finite element of the C++ program code, including linear, nonlinear, extended finite element module, and other geometric finite element module)