%%
%1使用hold on可将两个图像放在一个图形中
hold on
plot(cos(0:pi/20:2*pi),'>r');
plot(sin(0:pi/20:2*pi),'<g');
hold off

%%
%2将图例添加到图形中；位置调整
x=0:0.5:4*pi;
y=sin(x); h=cos(x); w=1./(1+exp(-x));
g=(1/(2*pi*2)^0.5).*exp((-1.*(x-2*pi).^2)./(2*2^2));
plot(x,y,'bd-',x,h,'gp:',x,w,'ro-',x,g,'c^-');
legend('sin(x)','cos(x)','Sigmoid','Gauss function');

%%
%3添加标题和xy轴说明
x = 0:0.1:2*pi; y1 = sin(x); y2 = exp(-x); 
plot(x, y1, '--*', x, y2, ':o');
xlabel('t = 0 to 2\pi');
ylabel('values of sin(t) and e^{-x}')
title('Function Plots of sin(t) and e^{-x}');
legend('sin(t)','e^{-x}');

%%
%4添加说明text()到指定位置annotation
x = linspace(0,3); y = x.^2.*sin(x); plot(x,y); 
line([2,2],[0,2^2*sin(2)]); 
str = '$$ \int_{0}^{2} x^2\sin(x) dx $$'; 
text(0.25,2.5,str,'Interpreter','latex');
annotation('arrow','X',[0.32,0.5],'Y',[0.6,0.4]);

%%
%5图形对象
x = linspace(0, 2*pi, 1000);
y = sin(x); h = plot(x,y); 
get(h)
set(gca, 'XLim', [0, 2*pi]);
set(gca, 'YLim', [-1.2, 1.2]);

%%
%6设定轴距大小
set(gca, 'XTick', 0:pi/2:2*pi);
set(gca, 'XTickLabel', 0:90:360);

%%
%7设定轴距大小
set(gca, 'FontName', 'symbol');
set(gca, 'XTickLabel', {'0', 'p/2', 'p', '3p/2', '2p'});

%%
%8设定线段颜色、粗细、样式
set(h, 'LineStyle', '-.','LineWidth', 7.0, 'Color', 'g');
plot(x,y,'-.g','LineWidth', 7.0);

%%
%9标记器的面和边颜色
x=rand(20,1); set(gca, 'FontSize', 18);
plot(x,'-md','LineWidth', 2, 'MarkerEdgeColor', 'k','MarkerFaceColor', 'g','MarkerSize', 10);
xlim([1, 20]);
%%
%10subplot分成四个图形，展示不同的样式
t = 0:0.1:2*pi; x = 3*cos(t); y = sin(t);
subplot(2, 2, 1); plot(x, y); axis normal
subplot(2, 2, 2); plot(x, y); axis square
subplot(2, 2, 3); plot(x, y); axis equal
subplot(2, 2, 4); plot(x, y); axis equal tight