于BP网络的权值优化是一个无约束优化问题，而且权值要采用实数编码，所以直接利用Matlab遗传算法工具箱。以下贴出的代码是为一个19输入变量，1个输出变量情况下的非线性回归而设计的，如果要应用于其它情况，只需改动编解码函数即可。-BP network weights optimization is a constrained optimization problem, and the right value to real-coded, so the direct use of the Matlab genetic algorithm toolbox. The code posted below is a 19 input variables, a nonlinear regression in the case of the output variable designed to be applied to other circumstances, only changes to the encoding and decoding functions can be.