How to plot a random line in between 0 and a random variable?

I am currently learning how to use Matlab, this is what I have so far.

clc; clear;
V = randi([1 12]); 
t = linspace(0,100,100);
y = V*sin(8*pi*t);
plot(t,y);
xlim([0 100]);
ylim([-14 14]);
V_sat = % I am trying to have this equal a random number between 0 and V
yLineP = V_sat;
yLineN = V_sat * -1;
yline(yLineP);
yline(yLineN);

Answer 1

[Dyuman Joshi]

I assume you want to you don't just want integers, otherwise you would have used randi for that.

V = randi([1 12])

V = 5

t = linspace(0,100,100);
y = V*sin(8*pi*t);
plot(t,y);
xlim([0 100]);
ylim([-14 14]);

%rand returns a random scalar drawn from the uniform distribution in the interval (0,1).
V_sat = V*rand     % I am trying to have this equal a random number between 0 and V

V_sat = 1.5908

yLineP = V_sat;
yLineN = V_sat * -1;
yline(yLineP);
yline(yLineN);

[Matthew]

That is helpful, thank you!

[Dyuman Joshi]

You are welcome!

[Walter Roberson]

V_sat = V*rand     % I am trying to have this equal a random number between 0 and V

Note by the way, that unless V happens to be exactly 0, that V*rand will never exactly equal 0, and will never exactly equal V .

In the default mode, rand() should be understood to be effectively randi([1 2^53-1])/2^53 where the range of random integers excludes 0 and excludes 2^53 exactly, so rand() can never return exactly 0 and can never return exactly 1.