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Bug 746 - Built-in random number generator for unit tests
Summary: Built-in random number generator for unit tests
Status: NEW
Alias: None
Product: Eigen
Classification: Unclassified
Component: Tests (show other bugs)
Version: unspecified
Hardware: All All
: Normal Unknown
Assignee: Nobody
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Reported: 2014-02-19 11:48 UTC by Gael Guennebaud
Modified: 2019-12-04 13:01 UTC (History)
3 users (show)


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Description Gael Guennebaud 2014-02-19 11:48:15 UTC 
In order to ease the reproduction of unit test failures across different systems, we could have a built-in random number generator for the unit tests only. For instance, this implementation seems rather lightweight:

http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/MT2002/CODES/mt19937ar.c
Comment 1 Christoph Hertzberg 2014-02-19 12:46:19 UTC 
That's a good idea. I guess for our purposes even a simple LCG would be sufficient
https://en.wikipedia.org/wiki/Linear_congruential_generator

That is what glibc uses at the moment for rand(), so on many systems nothing will change (if we use the same coefficients). But MT19937 is also simple enough and I don't think the initialization cost really matters, either.
Comment 2 Gael Guennebaud 2014-02-19 14:18:44 UTC 
Much simpler indeed: http://www.mscs.dal.ca/~selinger/random/
Comment 3 Nobody 2019-12-04 13:01:15 UTC 
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