2D Random path within a unit square

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KalMandy
KalMandy on 21 May 2017
Commented: Image Analyst on 22 May 2017
Hi all, I want to generate a random path within a unit square and get the x,y coordinates of n=1000 points on it. start point and the end point can be picked up from the vertices of the unit square, i.e, (0,0), (0,1),(1,0),(1,1).
The code I have up to now is given as follows. But it does not restrict the path to lie inside the unit square. How can I solve this?
n=1000;
mypath = rand(n,2);
xp=mypath(:,1);
xp_s=cumsum(xp);
yp=mypath(:,2);
yp_s=cumsum(yp);
plot(xp_s,yp_s)

Answers (2)

Andrei Bobrov
Andrei Bobrov on 21 May 2017
Edited: Andrei Bobrov on 21 May 2017
n=1000;
mypath = rand(n,2);
m = cumsum(mypath);
mout = m./m(end,:); % MATLAB >= R2016b
mout = bsxfun(@rdivide,m,m(end,:)); % MATLAB < R2016b

Image Analyst
Image Analyst on 21 May 2017
I have a number of random walk demos and I've attached them. Feel free to use them however you wish.
  2 Comments
KalMandy
KalMandy on 21 May 2017
sorry, I could not find the solution with this.
Image Analyst
Image Analyst on 22 May 2017
In your loop, simply don't add the next random step if it would take you outside the unit box. Just get another step instead.

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