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Bug #16180
closedRandom.rand(max) ignores / is broken when max ceiling value is a float
Status:
Rejected
Assignee:
-
Target version:
-
ruby -v:
ruby 2.6.3p62 (2019-04-16 revision 67580) [x86_64-darwin18]
Backport:
Description
ruby 2.6.3p62 (2019-04-16 revision 67580) [x86_64-darwin18]
ruby 2.7.0preview1 (2019-05-31 trunk c55db6aa271df4a689dc8eb0039c929bf6ed43ff) [x86_64-darwin18]
Calling rand
with a float of > 1 always return 0.
Calling rand
with a float 0 < value > 1 will ignore the ceiling value.
e.g.
rand(1.1)
=> 0
rand(1.1)
=> 0
rand(0.5)
=> 0.9501516156613756
rand(0.5)
=> 0.6864252478379304
Updated by Hanmac (Hans Mackowiak) over 4 years ago
your cases are documented there: https://ruby-doc.org/core-2.6.4/Kernel.html#method-i-rand
When max.abs is greater than or equal to 1, rand returns a pseudo-random integer greater than or equal to 0 and less than max.to_i.abs.
Negative or floating point values for max are allowed, but may give surprising results.
Updated by nobu (Nobuyoshi Nakada) over 4 years ago
- Status changed from Open to Rejected
If you want random Float
values up to max
, use Random#rand
or Random.rand
instead of Kernel#rand
.
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