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Generate a random vector elements that sum up to one ?

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Rahim Rahim
Rahim Rahim 2022-12-29
回答： Image Analyst 2022-12-29
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.

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Image Analyst
Image Analyst 2022-12-29
Ran in:
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.

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