From: "alexeymuranov (Alexey Muranov)" <redmine@...>
Date: 2012-11-11T18:33:35+09:00
Subject: [ruby-core:49216] [ruby-trunk - Feature #7328] Move ** operator precedence under unary + and -


Issue #7328 has been updated by alexeymuranov (Alexey Muranov).


phluid61 (Matthew Kerwin) wrote:
> It woudl never be -i.  (-1) ** 0.5 => i (or, in complex coordinates, 0+1i,
>  which is basically what (6.123233995736766e-17+1.0i) means.
>  

What do you mean? Why (-1)^(0.5) i and not -i?  Mathematically, it is not defined.
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Feature #7328: Move ** operator precedence under unary + and -
https://bugs.ruby-lang.org/issues/7328#change-32772

Author: boris_stitnicky (Boris Stitnicky)
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 


I would like to ask to consider decreasing ** operator precedence just below that of -/+ unary operators. I know that other languages (eg. Python) have ** operator bind tighter than negation, but seeing -1 ** 0.5 give the result -1 and having to type parenthesis (-1) ** 0.5... Even if it's not worth changing, I'd like to hear this rationalized. I've asked about rationalization of this on SO, and nobody seems to know why this precedence is the way it is.


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