è¿ä¸ªä¸é¾å®ç°.
ä¸å¾æ¯èºæ线
x=cos(theta)
y=sin(theta)
z=theta
theta为åæ°
å¨ theta = pi/6 å¤çå线åæ³å¹³é¢ã
clear all
close all
t = linspace(0,4*pi,401);
x = cos(t);
y = sin(t);
z = t;
figure
axis square
hold on
plot3(x,y,z,'linewidth',2,'color','k')
% å¨t=pi/6å¤ååé为{-1/2,3^(1/2)/2,1}
% åç¹åæ 为(3^(1/2)/2,1/2,pi/6);
% å线
u = -1:.1:1;
xx = sqrt(3)/2 - u/2;
yy = 1/2 + u*sqrt(3)/2;
zz = pi/6 +u;
plot3(xx,yy,zz,'linewidth',2)
% æ³å¹³é¢
xlab = -1.1:1;
[xxx yyy] = meshgrid(xlab);
zzz = xxx/2 - sqrt(3)*yyy/2 + pi/6;
surf(xxx,yyy,zzz)
xlabel('x')
ylabel('y')
zlabel('z')
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