for loop does not plot all the plots

I am trying to plot this code :

clc;clear all;close all;
n=3;
t=linspace(0,24*n,100e3*n);
y1=cos(t*(pi/3))+sin(t*(pi/4));
plot(t,y1);
hold on;
plot(24*1,y1(1*100e3),'*');
hold on;
plot(24*2,y1(2*100e3),'*');
hold on;
plot(24*3,y1(3*100e3),'*');

using for loop but for some reason I get only the last plot .

this is my code using for loop:

clc;clear all;close all;
n=3;
t=linspace(0,24*n,100e3*n);
y1=cos(t*(pi/3))+sin(t*(pi/4));
plot(t,y1)
hold on;
for i=1:n
    hold on;
    plot(24*n,y1(n*100e3),'*');
    hold on
    
end
hold off

where is my problem ?

Answer 1

[Torsten]

plot(24*i,y1(i*100e3),'*');

instead of

plot(24*n,y1(n*100e3),'*');

[tomer polsky]

can't belive I did not notice it ... thank you very much !!!