Random Number Generator: Difference between revisions
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Add Wichmann-Hill |
→Wichmann-Hill: Link the original paper |
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=== Wichmann-Hill === |
=== Wichmann-Hill === |
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In 1982, Brian Wichmann and David Hill proposed to combine three linear congruential generators, then normalizing and summing the results to get a number uniformly distributed between 0 and 1. A common instance is: |
In 1982, Brian Wichmann and David Hill [https://doi.org/10.2307/2347988 proposed] to combine three linear congruential generators, then normalizing and summing the results to get a number uniformly distributed between 0 and 1. A common instance is: |
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<source lang="c"> |
<source lang="c"> |
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seed[2] = (170 * seed[2]) % 30323; |
seed[2] = (170 * seed[2]) % 30323; |
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return fmod(seed[0] / 30269.0 + seed[1] / 30307.0 + seed[2] / 30323.0, 1.0); |
return fmod(seed[0] / 30269.0 + seed[1] / 30307.0 + seed[2] / 30323.0, 1.0); |
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} |
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</source> |
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This version is known to have a period of just shy of of seven trillion (the least common multiple of 30268, 30306, and 30322). |
This version is known to have a period of just shy of of seven trillion (the least common multiple of 30268, 30306, and 30322). |
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