Message boards : Rosetta@home Science : Random Seed
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Golden Turtle Send message Joined: 23 Sep 05 Posts: 34 Credit: 22,941 RAC: 0 |
Can somone please explain 'Random Seeds'? I see:- #====etc #random seed: {eg}1021801#=== etc and also sometimes a second #random seed# and occasionaly a third, they appear on each WU showing in BOINC LogX history for each WU completed. Are lower numbers good or bad? I have looked in the Wiki but see no explanation. |
David E K Volunteer moderator Project administrator Project developer Project scientist Send message Joined: 1 Jul 05 Posts: 1018 Credit: 4,334,829 RAC: 0 |
The random seed is an initial integer used by our random number generator. Given a seed value, it provides a random number which ultimately determines the trajectory of the predictions. In other words, identical work units that use the same random number seed should provide identical results. However, since there can be numerical differences between different operating systems and architectures there can be differences in results even with the same random number seed. Each time a rosetta run initializes, it may either generate a seed based on the time on your computer or use a seed that we provide. If the seed is based on the time on your computer, then different #random seed# values may occur when the run is stopped and restarted. We use the random number generator ran3 from numerical recipes. I have heard that lower numbers using this method may produce non-random numbers but we avoid low numbers. |
Golden Turtle Send message Joined: 23 Sep 05 Posts: 34 Credit: 22,941 RAC: 0 |
David. Many thanks for your reply, I think I understand. |
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Random Seed
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