Generate a sequence of random numbers that sum up to 1?

[Michael Spencer]

Anthony Liu wrote:
> I am at my wit's end.
> 
> I want to generate a certain number of random numbers.
>  This is easy, I can repeatedly do uniform(0, 1) for
> example.
> 
> But, I want the random numbers just generated sum up
> to 1 . 
> 
> I am not sure how to do this.  Any idea?  Thanks.
> 
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Divide each of your random numbers by their sum, perhaps?

Michael