how to assign random numbers that add up to equal 1

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Hunter Herrenkohl 2019-3-10

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https://ww2.mathworks.cn/matlabcentral/answers/449304-how-to-assign-random-numbers-that-add-up-to-equal-1

评论： John D'Errico 2019-3-10

I want to have a,b,c, and d all be random numbers greater than 0. I need a>bcd and b>cd. I also need the numbers to add up to 1. Is there anyway I can do this?

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Answer 1

Walter Roberson 2019-3-10

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https://ww2.mathworks.cn/matlabcentral/answers/449304-how-to-assign-random-numbers-that-add-up-to-equal-1#answer_364722

File Exchange, Roger's randfixedsum() and sort in descending order.

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John D'Errico 2019-3-10

+1. but with a minor flaw: Note that c > d is not required by the problem statement. As such the set

[0.4, 0.3, 0.1, 0.2]

Should be allowed. So if the goal is purely that a > bcd and b > cd, then you need to randomly shuffle the two smallest elements after the sort to gain a truly valid set that will satisfy the requirements and sample the entire space uniformly.

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