怎样用matlab求函数的极值点和拐点答:syms x y f=x^3-y^3+3*x^2+3*y^2-9*x ;fx=diff(f,x);fy=diff(f,y);[x0 y0]=solve(fx,fy,'x','y')ffx=diff(fx,x);ffy=diff(fy,y);fxfy=diff(fx,y);[x1 y1]=solve(ffx,ffy,'x','y')x0和y0是极值点,x1和y1是拐点 ...
怎么用MATLAB求二次函数最小值答:y=[23265,23029,22907,22668,22264,22083,22112,22096,21864,21742,21733,21844,21787,21756,21838,21984,21971,21876,21879,21996];p2=polyfit(x,y,2)xx=min(x):0.1:max(x);yy=polyval(p2,x);Y=vpa(poly2sym(p2,'x'),6)%转化为多项式格式 Y1=diff(Y)%求一阶导数 Xmin=eval(solve(...
matlab编程问题 求一列数据中连续出现次数最多的数答:x=[1,2,3,3,3,3,3,5,5,6,6,6,3,3,1,1,1,1,1,4,5,1,1];NewNumber = find([true;diff(x(:))~=0;true]);NewNumberCount = [NewNumber(1:end-1) diff(NewNumber )];AimCountPosition=find(NewNumberCount(:,2)==max(NewNumberCount(:,2)));for i=1:length(AimCount...