MATLAB绘图，绘双坐标轴，绘一图二轴等

clc;
clear all;
close all;

% %% 画极坐标系
% x = 0:.01 * pi:0.5 * pi;
% y = cos(x) + sqrt(-1) * sin(x);
% plot(y*2,\'r\',\'linewidth\',5);
% hold on
% warning(\'off\')
% 
% x = pi * 0.5:0.01:pi;
% y = cos(x) + sqrt(-1) * sin(x);
% plot(y*2,\'y\',\'linewidth\',5);
% hold on
% warning(\'off\')
% 
% x = pi :0.01:1.5 * pi;
% y = cos(x) + sqrt(-1) * sin(x);
% plot(y*2,\'b\',\'linewidth\',5);
% hold on
% warning(\'off\')
% 
% x = 1.5 * pi :0.01:2 * pi;
% y = cos(x) + sqrt(-1) * sin(x);
% plot(y*2,\'g\',\'linewidth\',5);
% hold on
% warning(\'off\')
% 
% title(\'极坐标系\');
% text([1.5,-3,1.5,-3],[2,2,-2,-2],{\'第一象限\',\'第二象限\',\'第三象限\',\'第四象限\'});
% legend({\'[0 0.5\pi]\',\'[0.5\pi \pi]\',\'[\pi 1.5\pi]\',\'[1.5\pi 2\pi]\'});
% xlim([-4,4]);
% ylim([-4,4]);
% 
% plot([-3,3],[0,0],\'k\',\'linewidth\',4)
% plot([0,0],[-3,3],\'k\',\'linewidth\',4)
% 
% axis off
% %% 画双轴坐标（1）
% figure
% ang1 = 0:.01*pi:2*pi;
% amp1 = sin(0:.01*pi:2*pi);
% z = amp1 .*(cos(ang1) + sqrt(-1) *sin(ang1));
% [Ax,H1,H2] = plotyy(0:200,abs(z),0:200,angle(z) * 180/pi);
% set(get(Ax(1),\'ylabel\'),\'string\',\'sfsdf\');
% set(get(Ax(2),\'ylabel\'),\'string\',\'dsfsdffd\');
% set(H1,\'linewidth\',3)
% set(H2,\'linestyle\',\':\',\'linewidth\',3)

%% 一图多轴

x1 = (0:.1:40);
y1 = 4 .* cos(x1) ./ (x1 + 2);
mag = magic(20);
x2 = (1:.2:20);
y2 = x2.^2./x2.^3;
%显示第一个坐标轴对象
h11 = line(x1,y1,\'color\',\'r\',\'linewidth\',2);
ax1 = gca;
set(ax1,\'linewidth\',2);
%添加第二个坐标轴对象
A = get(ax1,\'position\');%获取ax1的位置，为[left，bottom，width，height]
A(1:2) = A(1:2) + 0.1;
A(3:end) = A(3:end) - 0.2;
ax2 = axes(\'position\',A,...
           \'xAxisLocation\',\'bottom\',...
           \'yAxisLocation\',\'left\',...
           \'Color\',\'none\',...
           \'xColor\',\'k\',\'yColor\',\'k\');
 %注意这里如果用plot函数，将会产生图像覆盖，应为line是产生几何图像
 h12 = line(x2,y2,\'color\',\'k\',\'parent\',ax2,\'linewidth\',2);
 h12 = line(x2,y2+0.1,\'color\',\'k\',\'parent\',ax2,\'linewidth\',2);
 set(ax2,\'linewidth\',2);
 box off
 xlim([0,20]);
 ylim([0,2]);
%  xlimitsl = get(ax1,\'xlim\')