plotting multiple graphs and adding a straight line

I am trying to plot multiple graphs, and I want to add a straight line of y = 2.3 into the graph but it only shows my first two plots which are x1,OA and x2,OF.

here is my code

x1 = [0:1:101];

OA = 0.00022494*x1.^2;

x2 = [0:1:74.4];

OF = -0.00018056*x2.^2;

x3 = [101:1:265];

AC = 2.3;

plot(x1,OA,'r',x2,OF,'r',x3,AC,'r')

Answer 1

[Star Strider]

There are at least 2 ways to do that:

x1 = [0:1:101];
OA = 0.00022494*x1.^2;
x2 = [0:1:74.4];
OF = -0.00018056*x2.^2;
x3 = [101:1:265];
AC = 2.3;

figure
plot(x1,OA,'r',x2,OF,'r',x3,AC,'r')
yline(2.3)                                              % First Option

figure
plot(x1,OA,'r',x2,OF,'r',x3,AC,'r')
hold on
plot(xlim, [1 1]*2.3, '-b')                             % Second Option
hold off

.

[Lim Zhi Yang]

that works thanks so much !!

[Star Strider]

As always, my pleasure!