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1、_________________________________Matlab隐函数画三维曲线、曲面________________________________心1:f=@(x,y,z)(x.^2+(9/4)*y.^2+z.^2-1).^3-x.^2.*z.^3-(9/80)*y.^2.*z.^3;implicitmesh(f,[-1.51.5],[-.8.8],[-1.51.5],50);效果：心2：f=@(x,y,z)(x.^2+(9/4)*y.^2+z.^2-1).^3-x.^2.*z.^3-(9/80)*y.^2.*z.^3
2、;h=implicitsurf(f,[-1.51.5],[-.8.8],[-1.51.5],50);set(h,'AmbientStrength',.5)效果：见2楼》》附录：[implicitmesh.m]functionh=implicitmesh(f,xlimit,ylimit,zlimit,gd)ifnargin==2 ylimit=xlimit;zlimit=xlimit;gd=25;elseifnargin==3 gd=ylimit;ylimit=xlimit;zlimit=xlimit;elseifnargin==
3、4 gd=25;elseifnargin==5else error('Errorininputarguments')endx=linspace(xlimit(1),xlimit(2),gd);y=linspace(ylimit(1),ylimit(2),gd);z=linspace(zlimit(1),zlimit(2),gd);[x,y,z]=meshgrid(x,y,z);val=f(x,y,z);[f,v]=isosurface(x,y,z,val,0);ifisempty(f) warning('Thereisnog
4、raphintherange.'); p=[];else newplot; p=patch('Faces',f,'Vertices',v,'CData',v(:,3),'facecolor','w','EdgeColor','flat'); isonormals(x,y,z,val,p);view(3);gridonend ifnargout==0else h=p;end%%_____________________________________分割线__________________________
5、______________%%[implicitsurf.m]functionh=implicitsurf(f,xlimit,ylimit,zlimit,gd)ifnargin==2 ylimit=xlimit;zlimit=xlimit;gd=25;elseifnargin==3 gd=ylimit;ylimit=xlimit;zlimit=xlimit;elseifnargin==4 gd=25;elseifnargin==5else error('Errorininputarguments')endx=linspa
6、ce(xlimit(1),xlimit(2),gd);y=linspace(ylimit(1),ylimit(2),gd);z=linspace(zlimit(1),zlimit(2),gd);[x,y,z]=meshgrid(x,y,z);val=f(x,y,z);[f,v]=isosurface(x,y,z,val,0);ifisempty(f) warning('Thereisnographintherange.'); p=[];else newplot; p=patch('Faces',f,'Vertices',v,
7、'CData',v(:,3),'facecolor','flat','EdgeColor','k');isonormals(x,y,z,val,p);view(3);gridonendifnargout==0else h=pend
