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

How I can generate a random vector v = [v1, ..., v15] such that v1+...+v15 = 1. Please help me. :MSA

Answer 1

[John D'Errico]

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.

[Sultan]

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