How can I show the maximum in my graphs?

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Mo_B
Mo_B 2017-1-10
评论： the cyclist 2017-1-11
Hi guys,
I got the maximum of y4, but I don't know how to show it in my graphs.
clear all
close all
x=(0:0.01:80).';
y1=(0.02049/0.4)*x;
y2=(0.53*60./(1+(1.331./(sqrt(0.0631*x./(83.18-x))).^3)));
y3=(0.53*60./(1+(1.331./(sqrt(0.0631*x./(83.18-x))).^3)))-(0.02049/0.4)*x;
y4=(0.02049/0.4)*x-(0.53*60./(1+(1.331./(sqrt(0.0631*x./(83.18-x))).^3)));
figure
plot(x,y1,'r')
hold on
plot(x,y2,'c')
plot(x,y3,'g')
plot(x,y4,'b')
legend('Line1','Line2','Line3','Line4')
axis([0 80 -1 3.5])
x=linspace(0, 80, 200);
y4=@(x) (0.02049/0.4)*x-(0.53*60./(1+(1.331./(sqrt(0.0631*x./(83.18-x))).^3)));
f = y4(x);
[y4Max, iMax] = max(f)
xMax = x(iMax)
Thank you very much

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采纳的回答

the cyclist
the cyclist 2017-1-10
Do you mean like this?
line([xMax xMax],ylim)
  2 个评论
Mo_B
Mo_B 2017-1-10
编辑：Mo_B 2017-1-10
Thanks a lot, do you know a way to stop the vertical line when it hits the function? And display the x-value?
the cyclist
the cyclist 2017-1-11
y_lim = ylim;
line([xMax xMax],[y_lim(1) y4Max])
text(xMax,y4Max+0.1,'Wheeee!')

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