一、方法一yyaxis函数 x = linspace(0,pi);y1 = cos(x);yyaxis left; % 激活左边的轴plot(x,y1)xlabel('X-axis');ylabel('left Y-axis'); % 给左y轴添加轴标签hold onyyaxis right; % 激活右边的轴y2 = cos(2*x);plot(x,y2)ylim([-1,1