如何用matlab求多元函数的极值答:判别极大值点 D1=subs(subs(D,'x',xx(1)),'y',yy(1))A1=subs(subs(A,'x',xx(1)),'y',yy(1))D2=subs(subs(D,'x',xx(2)),'y',yy(2))A2=subs(subs(A,'x',xx(2)),'y',yy(2))极大值点和极大值 [xx(2) yy(2)]JDZ=subs(subs(z,'x',xx(2)),'y',yy(...
matlab 求函数的极值点和拐点答:function hh global dy1 dy2 y='x^2*sin(x^2-x-2)'dy1=diff(y)dy2=diff(y,2)subplot(3,1,1)ezplot(y,[-2 2])subplot(3,1,2)ezplot(dy1,[-2 2]),hold on,plot(-2:2,zeros(length(-2:2)))subplot(3,1,3)ezplot(dy2,[-2 2]),hold on,plot(-2:2,zeros(length(...