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

조회 수: 2 (최근 30일)
Matthew . 2023년 9월 19일
댓글: Walter Roberson . 2023년 9월 19일
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);

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### 채택된 답변

Dyuman Joshi 2023년 9월 19일
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);
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Dyuman Joshi 2023년 9월 19일
You are welcome!
Walter Roberson 2023년 9월 19일
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.

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