lagelangri

代码说明：

  基本的拉格朗日乘子法(又称为拉格朗日乘数法)，就是求函数f(x1,x2,...)在g(x1,x2,...)=0的约束条件下的极值的方法。其主要思想是引入一个新的参数λ(即拉格朗日乘子)，将约束条件函数与原函数联系到一起，使能配成与变量数量相等的等式方程，从而求出得到原函数极值的各个变量的解。(The basic Lagrange multiplier method (also known as Lagrange multiplier method) is the method of finding the extremum of function f (x1, x2,...) under the constraint of G (x1, x2,...) = 0. The main idea is to introduce a new parameter lambda (Lagrange multiplier), which links the constraint function with the original function, so that the equation can be formulated with the same number of variables, and the solutions of each variable of the extremum of the original function can be obtained.)