From: zpdcodes@... Date: 2020-03-12T06:30:43+00:00 Subject: [ruby-core:97460] [Ruby master Bug#16677] Negative integer powered (**) to a float number results in a complex 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: