gradrosen.m

来自「1、掌握MATLAB优化工具箱的基本用法」· M 代码 · 共 7 行

function [f,g]=gradrosen(x)
f=100*(x(2)-x(1)^2)^2+(1-x(1))^2;% compute the function value at x
if nargout > 1   % fun called with 2 output arguments
   g(1)=-2*(1-x(1))-400*x(1)*(x(2)-x(1)^2);   % compute the gradient evaluated at x
   g(2)=200*(x(2)-x(1)^2);    
end