MATLAB霍然06062216第一题ezsurf('(6+2*cos(u))*cos(v)','(6+2*cos(u))*sin(v)','2*sin(u)',[0,2*pi,0,2*pi])…holdon…ezsurf('2*sin(u).*cos(v)','2*sin(u).*sin(v)','2*cos(u)',[0,pi,0,2*pi])…holdoff…axisequal第二题(1)[a,b]=meshgrid(-8:.5:8);c=sqrt(a.^2+b.^2)+eps;z=sin(c)./c;subplot(2,2,1)mesh(a,b,z)axissquareaxisautoshg(2)[a,b]=meshgrid(-8:.5:8);c=sqrt(a.^2+b.^2)+eps;z=sin(c)./c;I=find(c>8);z(I)=NaN;mesh(a,b,z)subplot(1,1,1)axissquare;axisauto;shg(3)[a,b]=meshgrid(-12:.5:12);c=sqrt(a.^2+b.^2)+eps;z=sin(c)./c;subplot(1,1,1)mesh(a,b,z)axissquare;axisauto;shg(4)subplot(2,2,4)[a,b]=meshgrid(-12:.5:12);c=sqrt(a.^2+b.^2)+eps;z=sin(c)./c;I=find(c>12);z(I)=NaN;mesh(a,b,z)axissquare;axisauto;shg第三题球面：ezmesh('3*sin(u)*cos(v)','3*sin(u)*sin(v)','3*cos(u)',[0,3*pi,0,4*pi]);axisequal;椭球面：ezsurf('3*sin(u)*cos(v)','3*sin(u)*sin(v)','1*cos(u)',[0,5*pi,0,9*pi]);axisequal;双叶双曲面：myeps=pi/10;ezsurf('3*tan(u)*cos(v)','4*tan(u)*sin(v)','5*sec(u)',[-pi/2+myeps,pi/2-myeps,0,2*pi]);holdon;ezsurf('3*tan(u)*cos(v)','4*tan(u)*sin(v)','5*sec(u)',[pi/2+myeps,3*pi/2-myeps,0,2*pi]);axisequal;holdoff;单叶双曲面：ezsurf('3*sec(u)*cos(v)','4*sec(u)*sin(v)','5*tan(u)',[-pi/2+myeps,pi/2-myeps,0,2*pi]);axisequal;shg第四题ezplot3('1*t*sin(t)','1*t*cos(t)','t^2/5',[0,100]););shg；第五题[x,y]=meshgrid(-50:1:50,-50:1:50);z=x.^2/9-y.^2/4;meshz(x,y,z)gridoffcolormap('gray');title('马鞍面')shg;