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authorSverker Eriksson <[email protected]>2011-03-28 16:38:57 +0200
committerSverker Eriksson <[email protected]>2011-03-28 19:08:49 +0200
commitb52a2170d13fe7ff6e4e3b146b63d8f68c2aaadf (patch)
tree65e17f5ad014584b327ac49dcf47e37f05f87d4b /lib/stdlib/doc
parentc50f179a15ad8c8bcbc7a71101a9ca23f19f6e8f (diff)
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Improve algorithm in module random.
Avoid seed values that are even divisors of the primes and by that prevent getting seeds that are stuck on zero. Example: random:seed(0,0,0) would produce a series of only zeros.
Diffstat (limited to 'lib/stdlib/doc')
-rw-r--r--lib/stdlib/doc/src/random.xml7
1 files changed, 6 insertions, 1 deletions
diff --git a/lib/stdlib/doc/src/random.xml b/lib/stdlib/doc/src/random.xml
index dcc6d756e1..26f22db48e 100644
--- a/lib/stdlib/doc/src/random.xml
+++ b/lib/stdlib/doc/src/random.xml
@@ -4,7 +4,7 @@
<erlref>
<header>
<copyright>
- <year>1996</year><year>2009</year>
+ <year>1996</year><year>2011</year>
<holder>Ericsson AB. All Rights Reserved.</holder>
</copyright>
<legalnotice>
@@ -146,6 +146,11 @@
<c>random_seed</c> to remember the current seed.</p>
<p>If a process calls <c>uniform/0</c> or <c>uniform/1</c> without
setting a seed first, <c>seed/0</c> is called automatically.</p>
+ <p>The implementation changed in R15. Upgrading to R15 will break
+ applications that expect a specific output for a given seed. The output
+ is still deterministic number series, but different compared to releases
+ older than R15. The seed <c>{0,0,0}</c> will for example no longer
+ produce a flawed series of only zeros.</p>
</section>
</erlref>