[#76442] [Ruby trunk Feature#11741] Migrate Ruby to Git from Subversion — naruse@...
Issue #11741 has been updated by Yui NARUSE.
3 messages
2016/07/19
[#76515] [Ruby trunk Bug#12610] webrick: protect from httpoxy — nagachika00@...
Issue #12610 has been updated by Tomoyuki Chikanaga.
3 messages
2016/07/22
[ruby-core:76313] [Ruby trunk Feature#12217] Introducing Enumerable#sum for precision compensated summation and revert r54237
From:
muraken@...
Date:
2016-07-08 01:36:05 UTC
List:
ruby-core #76313
Issue #12217 has been updated by Kenta Murata.
> For example, [false].sum returns 0.
I reported this undocumented behavior as a bug several months ago.
https://github.com/rails/rails/issues/24796
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Feature #12217: Introducing Enumerable#sum for precision compensated summation and revert r54237
https://bugs.ruby-lang.org/issues/12217#change-59549
* Author: Kenta Murata
* Status: Closed
* Priority: Normal
* Assignee: Kenta Murata
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In this issue I propose to introduce Enumerable#sum for precision compensated summation of an array of floating point numbers.
In r54237, I've changed Enumerable#inject to support precision compensated summation for summing up floating point numbers.
But I noticed that this commit broke the equality of `ary.inject(:+) == ary.inject {|a, x| a + x }`.
I think this equality is important property of inject method, so I don't want to break it.
And because precision compensated algorithms are complicated, I think they are provided in the standard library, especially simple summation.
---Files--------------------------------
inject-plus.txt (1.21 MB)
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