Matlab怎么像图中用虚线把最低点标记出来

Question

如题所述

Answer 1

% 以y=x^2-2x+3为例
x=linspace(0,3,1000);
y=x.^2-2.*x+3;
y0=min(y);
x0=find(y==y0);
plot(x,y);
hold on;
line([0 x(x0)],[y0 y0],'linestyle',':');
line([x(x0) x(x0)],[0 y0],'linestyle',':');