MATLAB Answers


Generating 15 random values (array of 1x15 dim) whose sum equal to 1.

Asked by Sultan
on 28 Sep 2017
Latest activity Edited by Sultan
on 29 Sep 2017
How I can generate a random vector v = [v1, ..., v15] such that v1+...+v15 = 1. Please help me. :MSA


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1 Answer

Answer by John D'Errico
on 28 Sep 2017
Edited by John D'Errico
on 28 Sep 2017

1. Download randfixedsum from the file exchange.
2. Use it.
Do NOT generate a set of random numbers, then just scale them to sum to 1.

  1 Comment

Thanks John. I want to generate 1x15 dim array v =[v1,...,v15] such that v1+...+v15=1, vi\in [0,1], i=1,...15. The function randfixedsum(n,m,s,a,b) is showing error when I am running [x,v] = randfixedsum(1,15,1,0,1). Following is the error:
Index exceeds matrix dimensions.
Error in randfixedsum (line 95) x = (b-a)*x(p+repmat([0:n:n*(m-1)],n,1))+a; % Permute & rescale x

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