two data in one plot graph

I have two set of data

x

y1 y2

I want to plot (x,y1) and (x,y2) at a same graph. How do I do that??

they all have same matrix.

Also how can I find a break even point ?

Answer 1

[Sara]

figure
plot(x,y1,x,y2)

or

plot(x,y1,'r',x,y2,'b')

if you want to assign colors to the curves. If you want to find where they intersect, I recommend: http://www.mathworks.com/matlabcentral/fileexchange/11837-fast-and-robust-curve-intersections/content/intersections.m

[x0,yo]=intersections(x,y1,x,y2,1);

Answer 2

[Lisa Justin]

Sara is correct, you could also use

plot(x,y1,'r')
hold on
plot(x,y2,'b')