[#97536] [Ruby master Bug#16694] JIT vs hardened GCC with PCH — v.ondruch@...
Issue #16694 has been reported by vo.x (Vit Ondruch).
11 messages
2020/03/18
[ruby-core:97460] [Ruby master Bug#16677] Negative integer powered (**) to a float number results in a complex
From:
zpdcodes@...
Date:
2020-03-12 06:30:43 UTC
List:
ruby-core #97460
Issue #16677 has been updated by zpd (Zheng Piaodan). As far as I know there is no strictly correct math rule for evaluating `-2 ** 2.2` to `-(2 ** 2.2)` or `(-2) ** 2.2`. I expect the current behavior `-(2 ** 2.2)` since I think exponentiation takes higher precedence than unary minus operation. ---------------------------------------- Bug #16677: Negative integer powered (**) to a float number results in a complex https://bugs.ruby-lang.org/issues/16677#change-84604 * Author: CamilleDrapier (Camille Drapier) * Status: Open * Priority: Normal * Assignee: matz (Yukihiro Matsumoto) * ruby -v: 2.5.7, 2.6.5, 2.7.0 * Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN ---------------------------------------- Not sure if this is an unexpected behavior. This works as I expect: ``` -2 ** 2.2 # => -4.59479341998814 ``` But when I change the code a bit, it gives me a complex: ```ruby -2.to_i ** 2.2 # => (3.717265962412589+2.7007518095995273i) a = -2; a ** 2.2 # => (3.717265962412589+2.7007518095995273i) ``` This seems to happen only with negative numbers and float powers. I think it might be related to how `Fixnum` is treated differently from other classes by the power function. -- https://bugs.ruby-lang.org/ Unsubscribe: <mailto:ruby-core-request@ruby-lang.org?subject=unsubscribe> <http://lists.ruby-lang.org/cgi-bin/mailman/options/ruby-core>