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Posted to jira@arrow.apache.org by "Eduardo Ponce (Jira)" <ji...@apache.org> on 2021/05/24 21:41:00 UTC
[jira] [Commented] (ARROW-12861) [C++][Compute] Add sign function
kernels
[ https://issues.apache.org/jira/browse/ARROW-12861?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17350633#comment-17350633 ]
Eduardo Ponce commented on ARROW-12861:
---------------------------------------
IEEE 754 defines rules for +0.0 and -0.0, thus *sign(+0.0) = 1* and *sign(-0.0) = -1*. On the other hand, integral zero results in *sign(0) = 0*. Is this behavior reasonable?
> [C++][Compute] Add sign function kernels
> ----------------------------------------
>
> Key: ARROW-12861
> URL: https://issues.apache.org/jira/browse/ARROW-12861
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Eduardo Ponce
> Assignee: Eduardo Ponce
> Priority: Major
> Fix For: 5.0.0
>
>
> Add the sign function to the compute kernels.
> sign(X) =
> * 1 if X > 0
> * 0 if X = 0
> * -1 if X < 0
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