How to generate say 100 points randomly in a square or rectangle?
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GA optimization
on 18 Sep 2013
Commented: Akhil Govindraj
on 9 Mar 2022
I want to generate 100 points in a square , which side length is 5 m.
1 Comment
SUSHMA MB
on 3 Aug 2016
How to generate say 10 out of 100 random points on a straight line joining two points? I have two points let, (x1,y1) and (x2,y2). These two points are joined by a straight line. Now i want to generate, 10 points out of 100 random points on the straight line. Let the boundary be a square, with side length 50m
Accepted Answer
Azzi Abdelmalek
on 18 Sep 2013
Edited: Azzi Abdelmalek
on 18 Sep 2013
x=rand(1,100)*5
y=rand(1,100)*5
scatter(x,y)
or
a=rand(2,100)*5
scatter(a(1,:),a(2,:))
5 Comments
Tamoor Shafique
on 5 Sep 2020
How can I generate 100 random points in randomly in one of the sphere/cube/rectangulare 3D space?
Akhil Govindraj
on 9 Mar 2022
That's easy Tamoor Shafique, all you've gotta do is extend this code to the z axis as well and use scatter3() instead of scatter():
x=rand(1,100)*5;
y=rand(1,100)*5;
z=rand(1,100)*5;
scatter3(x,y,z)
More Answers (1)
Image Analyst
on 18 Sep 2013
Here's an alternate interpretation, if you want 100 locations in a matrix set to some value, such as 1.
% Randomly place a value of 1 at 100 locations.
m=10; % Whatever
% Make a "canvass" of all zeroes.
theArray = zeros(5*m);
% Get 100 linear indices randomly located
linearIndices = randperm(numel(theArray), 100);
% Make those 100 locations have a value of 1:
theArray(linearIndices) = 1;
3 Comments
Tamoor Shafique
on 5 Sep 2020
How can I generate 100 random points in randomly in one of the sphere/cube/rectangulare 3D space?
Image Analyst
on 6 Sep 2020
See the FAQ: https://matlab.fandom.com/wiki/FAQ#How_do_I_create_a_set_of_random_locations_within_a_circle.3F
There is also one for a sphere right below that. Adapt as needed.
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