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* [Bug manual/2516] New: typo in README.libm
@ 2006-04-05 15:59 bruno dot roggeri at supelec dot fr
2006-04-05 16:03 ` [Bug manual/2516] " bruno dot roggeri at supelec dot fr
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: bruno dot roggeri at supelec dot fr @ 2006-04-05 15:59 UTC (permalink / raw)
To: glibc-bugs
x and y are swapped in the sqrt algorithm explanation, README.libm line 489.
--
Summary: typo in README.libm
Product: glibc
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: manual
AssignedTo: roland at gnu dot org
ReportedBy: bruno dot roggeri at supelec dot fr
CC: glibc-bugs at sources dot redhat dot com
http://sourceware.org/bugzilla/show_bug.cgi?id=2516
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* [Bug manual/2516] typo in README.libm
2006-04-05 15:59 [Bug manual/2516] New: typo in README.libm bruno dot roggeri at supelec dot fr
@ 2006-04-05 16:03 ` bruno dot roggeri at supelec dot fr
2006-09-12 9:30 ` jakub at redhat dot com
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: bruno dot roggeri at supelec dot fr @ 2006-04-05 16:03 UTC (permalink / raw)
To: glibc-bugs
------- Additional Comments From bruno dot roggeri at supelec dot fr 2006-04-05 16:03 -------
Created an attachment (id=951)
--> (http://sourceware.org/bugzilla/attachment.cgi?id=951&action=view)
README.libm patch
I just found the "add attachment" link, so here's the "patch".
--
http://sourceware.org/bugzilla/show_bug.cgi?id=2516
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* [Bug manual/2516] typo in README.libm
2006-04-05 15:59 [Bug manual/2516] New: typo in README.libm bruno dot roggeri at supelec dot fr
2006-04-05 16:03 ` [Bug manual/2516] " bruno dot roggeri at supelec dot fr
@ 2006-09-12 9:30 ` jakub at redhat dot com
2006-09-12 10:37 ` bruno dot roggeri at supelec dot fr
2007-03-30 12:04 ` jakub at redhat dot com
3 siblings, 0 replies; 5+ messages in thread
From: jakub at redhat dot com @ 2006-09-12 9:30 UTC (permalink / raw)
To: glibc-bugs
------- Additional Comments From jakub at redhat dot com 2006-09-12 09:30 -------
Nope, your patch is wrong. x is the value we want to compute square root of
and it certainly doesn't need to be in the [1, 4) interval.
You either want to write:
* find an integer k such that 1 <= (y=x*2^(-2k)) < 4, then
* sqrt(x) = 2^k * sqrt(y)
or
* find an integer k such that 1 <= (y=x*2^(2k)) < 4, then
* sqrt(x) = 2^(-k) * sqrt(y)
--
http://sourceware.org/bugzilla/show_bug.cgi?id=2516
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* [Bug manual/2516] typo in README.libm
2006-04-05 15:59 [Bug manual/2516] New: typo in README.libm bruno dot roggeri at supelec dot fr
2006-04-05 16:03 ` [Bug manual/2516] " bruno dot roggeri at supelec dot fr
2006-09-12 9:30 ` jakub at redhat dot com
@ 2006-09-12 10:37 ` bruno dot roggeri at supelec dot fr
2007-03-30 12:04 ` jakub at redhat dot com
3 siblings, 0 replies; 5+ messages in thread
From: bruno dot roggeri at supelec dot fr @ 2006-09-12 10:37 UTC (permalink / raw)
To: glibc-bugs
------- Additional Comments From bruno dot roggeri at supelec dot fr 2006-09-12 10:37 -------
(In reply to comment #2)
> Nope, your patch is wrong. x is the value we want to compute square root of
> and it certainly doesn't need to be in the [1, 4) interval.
True.
> You either want to write:
> * find an integer k such that 1 <= (y=x*2^(-2k)) < 4, then
> * sqrt(x) = 2^k * sqrt(y)
> or
> * find an integer k such that 1 <= (y=x*2^(2k)) < 4, then
> * sqrt(x) = 2^(-k) * sqrt(y)
>
I think I prefer the first option. Or maybe something like this is easier to read :
* find an integer k such that 1 <= (y=x/(2^2k)) < 4, then
* sqrt(x) = 2^k * sqrt(y)
(I removed the parenthesis around 2k in an attempt to reduce "parenthesis bloat" :)
--
http://sourceware.org/bugzilla/show_bug.cgi?id=2516
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* [Bug manual/2516] typo in README.libm
2006-04-05 15:59 [Bug manual/2516] New: typo in README.libm bruno dot roggeri at supelec dot fr
` (2 preceding siblings ...)
2006-09-12 10:37 ` bruno dot roggeri at supelec dot fr
@ 2007-03-30 12:04 ` jakub at redhat dot com
3 siblings, 0 replies; 5+ messages in thread
From: jakub at redhat dot com @ 2007-03-30 12:04 UTC (permalink / raw)
To: glibc-bugs
------- Additional Comments From jakub at redhat dot com 2007-03-30 13:04 -------
This is actually fixed since September 2006.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
http://sourceware.org/bugzilla/show_bug.cgi?id=2516
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end of thread, other threads:[~2007-03-30 12:04 UTC | newest]
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2006-04-05 15:59 [Bug manual/2516] New: typo in README.libm bruno dot roggeri at supelec dot fr
2006-04-05 16:03 ` [Bug manual/2516] " bruno dot roggeri at supelec dot fr
2006-09-12 9:30 ` jakub at redhat dot com
2006-09-12 10:37 ` bruno dot roggeri at supelec dot fr
2007-03-30 12:04 ` jakub at redhat dot com
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