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cmath.acosh(complex('±0+nanj')) should return complex('nan±pi/2j') (imaginary part sign is unspecified) #121889

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cmath.acosh(complex('±0+nanj')) should return complex('nan±pi/2j') (imaginary part sign is unspecified)#121889
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type-bugAn unexpected behavior, bug, or error

Description

@skirpichev
skirpichev
opened on Jul 17, 2024

Bug report

Bug description:

As per C11 DR#471 (adjusted resolution accepted for C17). See glibc patch: https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=5244527da1bfa751492e146d3e6ae128c59bfcc4

Currently, imaginary part is nan.

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

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  1. skirpichev
    added
    type-bugAn unexpected behavior, bug, or error
    on Jul 17, 2024
  2. skirpichev
    changed the title [-]acosh(complex('±0+nanj')) should return complex('nan±pi/2j') (imaginary part sign is unspecified)[/-] [+]cmath.acosh(complex('±0+nanj')) should return complex('nan±pi/2j') (imaginary part sign is unspecified)[/+] on Jul 17, 2024
  3. skirpichev
    added a commit that references this issue on Jul 17, 2024

    pythongh-121889: cmath.acosh(0+nanj) returns nan+pi/2j

    4ab8205
  4. mdickinson
    added a commit that references this issue on Aug 4, 2024

    gh-121889: cmath.acosh(0+nanj) returns nan+pi/2j (#121892)

    3462a80

  5. mdickinson commented on Aug 4, 2024

    @mdickinson
    mdickinson
    on Aug 4, 2024
    Member

    Fixed in #121892 (with thanks to @skirpichev). As commented on the PR, I don't think this should be backported.

  6. mdickinson
    closed this as completedon Aug 4, 2024
  7. brandtbucher
    added a commit that references this issue on Aug 7, 2024

    pythongh-121889: cmath.acosh(0+nanj) returns nan+pi/2j (python#121892)

    1397b98
  8. blhsing
    added a commit that references this issue on Aug 22, 2024

    pythongh-121889: cmath.acosh(0+nanj) returns nan+pi/2j (python#121892)

    273f83b
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