Q: dynamic playlist of unrated songs

[D. R. Evans]

Leo Franchi said the following at 06/28/2009 07:01 PM :

>>
>> Suppose I want to populate a playlist with random songs from the set
>>  { unrated } ∪ { 5 stars }
>> How would I do that?
>>
>> The closest I have been able to come seems to select with equal  
>> probability
>> from the two sets { unrated } and { 5 stars }, which isn't the same  
>> thing
>> at all :-(
> 
> If you set two 100% proportional biases, you'll end up with a randomly  
> selected playlist that always picks from one of those two possible  
> conditions.

Right; that's exactly what I did, with the results I described :-(

Selecting with equal probability from two disjoint sets is not (in general)
at all the same as selecting randomly from the union of those sets (an
operation which was trivial in 1.4, and which is what I'm trying to do).

  Doc

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Web:  http://www.sff.net/people/N7DR

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