摘要： 1 clear; 2 x=-10:0.2:10; 3 y=-10:0.2:10; 4 z=x.^2+2.*x.*y+y.^2; 5 subplot(121); 6 plot3(x,y,z); 7 grid on; 8 9 subplot(122); 10 [xx,yy]=meshgrid(x,y); 阅读全文