Bug #9797: Math::log - missing domain error check

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: ruby 2.2.0dev (2014-05-03) [x64-mswin64_120]
• Backport: 2.0.0: WONTFIX, 2.1: WONTFIX

[cremno (cremno phobia)]

Math::log with a negative base should raise a Math::DomainError.

Math.log(-1.0)        # raises Math::DomainError
Math.log( 1.0, -1.0)  # doesn't (but calls `log(-1.0)` internally!)

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Closed
• % Done changed from 0 to 100

Applied in changeset r45795.

---

math.c: check domain of base argument

• math.c (math_log): check domain of base argument too. raises
  Math::DomainError instead of returning NaN if the base is less
  than 0, and returns NaN instead of -infinity if both of two
  arguments are 0. [ruby-core:62309] [Bug #9797]

[usa (Usaku NAKAMURA)]

• Backport changed from 2.0.0: UNKNOWN, 2.1: UNKNOWN to 2.0.0: WONTFIX, 2.1: UNKNOWN

[nagachika (Tomoyuki Chikanaga)]

• Backport changed from 2.0.0: WONTFIX, 2.1: UNKNOWN to 2.0.0: WONTFIX, 2.1: WONTFIX