From: Matthew Kerwin <matthew@...>
Date: 2012-11-11T17:44:14+09:00
Subject: [ruby-core:49214] Re: [ruby-trunk - Feature #7328] Move ** operator precedence under unary + and -

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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.


On 11 November 2012 18:01, alexeymuranov (Alexey Muranov) <
redmine@ruby-lang.org> wrote:

>
> Issue #7328 has been updated by alexeymuranov (Alexey Muranov).
>
>
> (-1) ** 0.5 should not be defined! I just tried it and it gave me
> (6.123233995736766e-17+1.0i) -- approximately the complex i. Why not -i ??
> ----------------------------------------
> Feature #7328: Move ** operator precedence under unary + and -
> https://bugs.ruby-lang.org/issues/7328#change-32768
>
> 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.
>
>
> --
> http://bugs.ruby-lang.org/
>
>


-- 
  Matthew Kerwin, B.Sc (CompSci) (Hons)
  http://matthew.kerwin.net.au/
  ABN: 59-013-727-651

  "You'll never find a programming language that frees
  you from the burden of clarifying your ideas." - xkcd

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It woudl never be -i. =A0(-1) ** 0.5 =3D&gt; i (or, in complex coordinates,=
 0+1i, which is basically what (<span style=3D"font-family:arial,sans-serif=
;font-size:13px">6.123233995736766e-17+1.0i) means.</span><div class=3D"gma=
il_extra">
<br><br><div class=3D"gmail_quote">On 11 November 2012 18:01, alexeymuranov=
 (Alexey Muranov) <span dir=3D"ltr">&lt;<a href=3D"mailto:redmine@ruby-lang=
.org" target=3D"_blank">redmine@ruby-lang.org</a>&gt;</span> wrote:<br><blo=
ckquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #c=
cc solid;padding-left:1ex">
<br>
Issue #7328 has been updated by alexeymuranov (Alexey Muranov).<br>
<br>
<br>
(-1) ** 0.5 should not be defined! I just tried it and it gave me (6.123233=
995736766e-17+1.0i) -- approximately the complex i. Why not -i ??<br>
<div class=3D"im">----------------------------------------<br>
Feature #7328: Move ** operator precedence under unary + and -<br>
</div><a href=3D"https://bugs.ruby-lang.org/issues/7328#change-32768" targe=
t=3D"_blank">https://bugs.ruby-lang.org/issues/7328#change-32768</a><br>
<div class=3D"HOEnZb"><div class=3D"h5"><br>
Author: boris_stitnicky (Boris Stitnicky)<br>
Status: Open<br>
Priority: Normal<br>
Assignee:<br>
Category:<br>
Target version:<br>
<br>
<br>
I would like to ask to consider decreasing ** operator precedence just belo=
w that of -/+ unary operators. I know that other languages (eg. Python) hav=
e ** operator bind tighter than negation, but seeing -1 ** 0.5 give the res=
ult -1 and having to type parenthesis (-1) ** 0.5... Even if it&#39;s not w=
orth changing, I&#39;d like to hear this rationalized. I&#39;ve asked about=
 rationalization of this on SO, and nobody seems to know why this precedenc=
e is the way it is.<br>

<br>
<br>
--<br>
<a href=3D"http://bugs.ruby-lang.org/" target=3D"_blank">http://bugs.ruby-l=
ang.org/</a><br>
<br>
</div></div></blockquote></div><br><br clear=3D"all"><div><br></div>-- <br>=
=A0 Matthew Kerwin, B.Sc (CompSci) (Hons)<br>=A0 <a href=3D"http://matthew.=
kerwin.net.au/" target=3D"_blank">http://matthew.kerwin.net.au/</a><br>=A0 =
ABN: 59-013-727-651<br>
<br>=A0 &quot;You&#39;ll never find a programming language that frees<br>=
=A0 you from the burden of clarifying your ideas.&quot; - xkcd<br>
</div>

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