plot 正弦曲线
x = 0:pi/100:2*pi; % 步长pi/100，将2pi分成200份
y = sin(x);
plot(x,y);
正弦曲线
surf 曲线
a = -1:.1:1;
[x,y] = meshgrid(a);
z = x.^2 + y.^2;
surf(x,y,z);
曲面图
球体
[x,y,z]=sphere(50); % 指定球由半圆弧由50个网格组成
mesh(3*x,3*y,3*z); % 指定球的半径为3
球体
>> [x,y,z]=sphere(4) //4个网格，5个点，类似正弦曲线的五点法作图
x =
0 0 0 0 0
-0.707106781186548 0.000000000000000 0.707106781186548 0.000000000000000 -0.707106781186548
-1.000000000000000 0.000000000000000 1.000000000000000 0.000000000000000 -1.000000000000000
-0.707106781186548 0.000000000000000 0.707106781186548 0.000000000000000 -0.707106781186548
0 0 0 0 0
y =
0 0 0 0 0
0 -0.707106781186548 0 0.707106781186548 0
0 -1.000000000000000 0 1.000000000000000 0
0 -0.707106781186548 0 0.707106781186548 0
0 0 0 0 0
z =
-1.000000000000000 -1.000000000000000 -1.000000000000000 -1.000000000000000 -1.000000000000000
-0.707106781186547 -0.707106781186547 -0.707106781186547 -0.707106781186547 -0.707106781186547
0 0 0 0 0
0.707106781186547 0.707106781186547 0.707106781186547 0.707106781186547 0.707106781186547
1.000000000000000 1.000000000000000 1.000000000000000 1.000000000000000 1.000000000000000
总共选取了14个点，效果差很多。
14点球
