Generate a random vector elements that sum up to one ?

Let us consider that we have a vector V.

Where V(1,6): the vector contains 6 columns (cases).

How can I set up a random vector that will sum up to 1. I mean that: sum(V(1,:)) == 1 ).

where all the elements should be beweent 0 and 1. Upperbounder =1 and lowbounder =1.

Answer 1

[Image Analyst]

Try this:

V = rand(1, 6);
V = V / sum(V) % Make it sum to 1 by dividing by the sum.

V = 1×6

0.1426 0.2113 0.2330 0.0874 0.2157 0.1100

theSum = sum(V)

theSum = 1

but many people use this:

https://www.mathworks.com/matlabcentral/fileexchange/9700-random-vectors-with-fixed-sum?s_tid=srchtitle

which is supposedly better for some reason.