>zy=diff(z,y) (x^2-2*x)*(-2*y-x)*exp(-X2-y2-x米y 直接绘制三维曲面 >>[x,y]= meshgrid(-3:2:3,-2:2:2) Z(x.^2-2*x).*exp(-x^2-y.2-x.*y); surf(xyz),axis([-33-22-0.71.5]>> zy=diff(z,y) zy = (x^2-2*x)*(-2*y-x)*exp(-x^2-y^2-x*y) • 直接绘制三维曲面 >> [x,y]=meshgrid(-3:.2:3,-2:.2:2); >> z=(x.^2-2*x).*exp(-x.^2-y.^2-x.*y); >> surf(x,y,z), axis([-3 3 -2 2 -0.7 1.5])