curve intersection and minimum value

Hy every one I have a small question :) It seem s very simple and easy but I did not succeed ... This is a simple script n=10 x1=linspace(0,2.5,n) x2=linspace(1,12,n) x3=linspace(1.5,8,n) x4=linspace(5,16,n) y1=1.2*x1 y2=1.3*x2+3 y3=2*x3 y4=3*x4 figure plot(x1,y1,'r','LineWidth',3) hold on plot(x2,y2,'b','LineWidth',3) hold on plot(x3,y3,'g','LineWidth',3) hold on plot(x4,y4,'k','LineWidth',3) legend('y1','y2','y3','y4')

not so difficult until now ...

The challenge is to draw the pink line ( or having a table with x and y for each point ) .

I don't knew if any one can help me

Thank you

[Sean de Wolski]

Are you trying to have the pink line trace the minimum y at each x point? Otherwise it's unclear to me what the pink line represents.

[Firas]

Yes Sean :) for each x , I want the minimum value of y Thanks