螺线 clearvars; close all; clc; %每个圆的周长是一样的 t = 0:0.01:4*pi; x = cos(t); y = sin(t); z = t*2; figure; plot3(x,y,z,'r-'); hold on; plot3(x,-y,z,'b') title('螺旋线'); xlabel('x axis'); ylabel('y axis'); zla