1、绘制三维线图
>>theta = 0:pi/50:6*pi;
>>x=cos(theta);
>>y=sin(theta);
>>z=0:300;
>>plot3(x,y,z);
2、绘制三维曲面图
>>x=-3:3;
>>y=-3:3;
>>[X,Y]=meshgrid(x,y);
(meshgrid将x生成7行,y生成7列)
>>Z=X.^2+Y.^2;
>>surf(X,Y,Z);
>>x=-3:0.5:3;
>>y=-3:0.5:3;
>>[X,Y]=meshgrid(x,y);
>>Z=sin(X)+sin(Y);
>>surf(X,Y,Z);