# Generate specific shape randomly using MATLAB

8 views (last 30 days)
Med Future on 6 Mar 2022
Commented: Image Analyst on 6 Mar 2022
Hello every one, I hope you are doing well
i have the following code,in which i have two thing. first is the val in which i have the value like 200 is the value and it repeat 120 times to complete the shape.
I want to do it randomly , like the value generate randomly between 1 to 1000 and num is also randomly between 1 to 500 . How can i generate it in MATLAB
val = [200,500,800,1000,800,900,700,300,600,150];
num = [120,400,200,400,300,450,200,400,500,400];
out4 = repelem(val,num);
scatter(1:length(out4),out4)
David Hill on 6 Mar 2022
Your explaination is not clear to me. A short example would be helpful.

Image Analyst on 6 Mar 2022
To generate fractional random numbers use rand(). To generate random integers use randi().
randomDoubles = 999 * rand(1, length(val)) + 1; % Between 1 and 1000
randomIntegers = randi([1, 500], 1, length(num)); % Between 1 and 500
Not sure what else you need to know beyond that. If you need something else, be very explicit and specific.
##### 2 CommentsShowHide 1 older comment
Med Future on 6 Mar 2022
@David Hill @Image Analyst I have explain the problem above . I want to generate that kind of shape randomly . now i am manually doing it using above code.

Image Analyst on 6 Mar 2022
Try this:
val = unique(sort(20 * randi(50, 10, 1)))
for k = 1 : length(val)
y = val(k);
num1 = randi(3500);
num2 = randi(4000);
plot([num1, num2], [y, y], 'b.-', 'LineWidth', 5, 'markerSize', 20)
hold on;
end
grid on
Image Analyst on 6 Mar 2022
Sorry, I tried, but now I'm heading out now to do some errands. Once you take that 2 hour training you'll be able to do it yourself. It sounds like it's a simple application of calling rand() or randi() and then using a for loop, something you'll be able to do after taking the 2 hour training. Good luck.

### Categories

Find more on Matrix Indexing in Help Center and File Exchange

R2021a

### Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by