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[x,fval]=fminbnd('fun0',0,1.5); xmax=x fmax=-fval

f='2*exp(-x).*sin(x)'; fplot(f,[0,8]); %作图语句 [xmin,ymin]=fminbnd (f, 0,8) f1='-2*exp(-x).*sin(x)'; [xmax,ymax]=fminbnd (f1, 0,8)

[x,y]=meshgrid(-2:0.1:2,-1:0.1:3); z=100*(y-x.^2).^2+(1-x).^2; mesh(x,y,z)

function f=fun2(x) f=100*(x(2)-x(1)^2)^2+(1-x(1))^2

[x,y]=meshgrid(-2:0.1:2,-1:0.1:3); z=100*(y-x.^2).^2+(1-x).^2; contour(x,y,z,20) hold on plot(-1.2,2,' o '); text(-1.2,2,'start point') plot(1,1,'o') text

Function f = fun3(x) y1=((100-x(1)- 0.1*x(2))-(30*exp(-0.015*x(1))+20))*x(1); y2=((280-0.2*x(1)- 2*x(2))-(100*exp(-0.02*x(2))+30))*x(2); f=-y1-y2;

oldoptions=optimset('fminunc') options=optimset(oldoptions,'LargeScale','off') options11=optimset(options,'HessUpdate','dfp') [x11,fval11,exitflag11,outp

f='100*(x(2)-x(1)^2)^2+(1-x(1))^2'; [x,fval,exitflag,output]=fminsearch(f, [-1.2 2])

function f = fun(x) f=-((100-x(1)- 0.1*x(2))-(30*exp(-0.015*x(1))+20))*x(1)-((280-0.2*x(1)- 2*x(2))-(100*exp(-0.02*x(2))+30))*x(2)

clear x0=[50,70]; x=fminunc('fun',x0) z=-fun(x)