无约束非线性最小化Fminunc求解测试函数Perm,matlab编程

clc clear close all x0=[2 2 ]; [xz,fval,exitflag,output,lambda]=fminunc(@permfun,x0); x = -2:0.1:2; y = -2:0.1:2; [x,y] = meshgrid(x,y); [m,n] = size(x); b=0.5; for ii = 1:m for jj = 1:n xx = [x(ii,jj) y(ii,jj)]; z(ii,jj) = permfun(xx, b); end end zz = permfun(xz, b); figure surf(x,y,z) hold on plot3(xz(1),xz(2),zz,'ro','MarkerFaceColor','r') hold off xlabel('x1') ylabel('x2') zlabel('z') legend('Perm曲面','最小值') title('Fminunc非线性有约束最小化') axis([-2 2 -2 2 0 120]) zlabel('Perm Function') set(gca,'fontsize',12) colormap jet view([192 27])