举例说明如下(后两句话完成你需要的功能, 即y轴范围最大值和x轴范围不变, 将y轴最小值设定为0):
x=linspace(-2*pi,2*pi,64); y=sin(x)+2; figure, plot(x,y) yl=get(gca,'ylim'); set(gca,'ylim',[0,yl(2)])
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