Hi all!
2^1024
_
2^1024 is set to infinity, which I think is according to the IEEE standard.
However the compulsory possibility to select to instead get an exception
is not implemented in J.
Division of any number with infinity then gives 0 in J, which I think
is a J invention and not according to standard.
Continued use of the zero can now give a totally random result of the
calculations.
See my recent thread about this.
Cheers,
Erling Hellenäs
On 2017-10-08 01:24, 'Skip Cave' via Beta wrote:
It would be marvelous if J was polite enough to warn me when a result is in
all likelihood not correct, rather than blithely returning an egregiously
wrong answer.
Skip
<<<>>>
x:1.9 % 2^1024
0
1.9 %&x: 2^1024
0
1.9 % 2^1024x
|domain error
| 1.9 %2^1024
1.9 %&x: 2^1024x
19r179769313486231590772930519078902473361797697894230657273
430081157732675805500963132708477322407536021120113879871393
357658789768814416622492847430639474124377767893424865485276
302219601246094119453082952085005768838150682342462881473913
1105408272371633...
Skip Cave
Cave Consulting LLC
On Sat, Oct 7, 2017 at 12:24 PM, Skip Cave <[email protected]> wrote:
1.9 %&x: 2^1024x
19r179769313486231590772930519078902473361797697894230657273
430081157732675805500963132708477322407536021120113879871393
357658789768814416622492847430639474124377767893424865485276
302219601246094119453082952085005768838150682342462881473913
1105408272371633...
x:1.9 % 2^1024
0
1.9 %&x: 2^1024
0
1.9 % 2^1024x
|domain error
| 1.9 %2^1024
Engine: j805/j64/windows
Release: commerciai/2016-12-11T08:02:16
Library: 8.05.14
Qt IDE: 1.5.4/5.6.2
Platform: Win 64
Installer: J805 install
lnstaiiPath: c:/program files/j64 -805
Skip Cave
Cave Consulting LLC
On Sat, Oct 7, 2017 at 10:57 AM, Skip Cave <[email protected]>
wrote:
Doesn't happen on my system:
1.9 %&x: 2^1024x
19r179769313486231590772930519078902473361797697894230657273
430081157732675805500963132708477322407536021120113879871393
357658789768814416622492847430639474124377767893424865485276
302219601246094119453082952085005768838150682342462881473913
1105408272371633...
Engine: j805/j64/windows
Release: commerciai/2016-12-11T08:02:16
Library: 8.05.14
Qt IDE: 1.5.4/5.6.2
Platform: Win 64
Installer: J805 install
lnstaiiPath: c:/program files/j64 -805
Skip Cave
Cave Consulting LLC
On Sat, Oct 7, 2017 at 10:05 AM, 'Pascal Jasmin' via Beta <
[email protected]> wrote:
this happens in 805 too,
1.9 %&x: 2^1024x
________________________________
From: Raul Miller <[email protected]>
To: Beta forum <[email protected]>
Sent: Saturday, October 7, 2017 8:56 AM
Subject: [Jbeta] Do I need to upgrade?
I was expecting a zero or a small value from this expression -
instead, I got an error.
1.9%2^1024x
|domain error
JVERSION
Engine: j806/j64/darwin
Beta-6: commercial/2017-09-26T14:12:52
Library: 8.06.07
Qt IDE: 1.6.1/5.6.3
Platform: Darwin 64
Installer: J806 install
InstallPath: /users/rauldmiller/applications/j64-806
Contact: www.jsoftware.com
(I was trying to investigate the representation of denormalized numbers.)
Thanks,
--
Raul
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