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How to generate say 100 points randomly in a square or rectangle?

Asked by GA optimization on 18 Sep 2013

I want to generate 100 points in a square , which side length is 5 m.

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2 Answers

Answer by Azzi Abdelmalek
on 18 Sep 2013
Edited by Azzi Abdelmalek
on 18 Sep 2013
 Accepted answer
x=rand(1,100)*5
y=rand(1,100)*5
scatter(x,y)

or

a=rand(2,100)*5
scatter(a(1,:),a(2,:))

  1 Comment

GA optimization on 19 Sep 2013

Thanks Azzi.


Answer by 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;

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