I think this is the difference between 32 and 64-bit, 9!:14'' j602/2008-03-03/16:45 3!:0[ 9999999999999999.3 4
In J32 a.i. 2 fc 9999999999999999.3 0 128 224 55 121 195 65 67 a.i. 2 fc 1e16 0 128 224 55 121 195 65 67 the number has the same bit pattern as 1e16 (an integer) which can be represented as a 64-bit integer. I guess J64 is correct since 9999999999999999.3 and 1e16 is the same number in ieee fp and J prefers integer to floats, eg 3!:0 [ 2.0 4 Ср, 09 авг 2017, robert therriault написал(а): > Hi Pascal, > > I see the same behaviour in j806 as j805. Do you see something different? > > JVERSION > Engine: j806/j64avx/darwin > Beta-4: commercial/2017-06-27T12:55:06 > Library: 8.06.03 > Qt IDE: 1.5.3/5.6.2 > Platform: Darwin 64 > Installer: J806 install > InstallPath: /users/bobtherriault/j64-806 > Contact: www.jsoftware.com > (; datatype) 999999999999999.3 > ┌────┬────────┐ > │1e15│floating│ > └────┴────────┘ > (; datatype) 9999999999999999.3 > ┌─────────────────┬───────┐ > │10000000000000000│integer│ > └─────────────────┴───────┘ > (; datatype) 99999999999999999.3 > ┌──────────────────┬───────┐ > │100000000000000000│integer│ > └──────────────────┴───────┘ > (; datatype) 999999999999999999.3 > ┌───────────────────┬───────┐ > │1000000000000000000│integer│ > └───────────────────┴───────┘ > (; datatype) 9999999999999999999.3 > ┌────┬────────┐ > │1e19│floating│ > └────┴────────┘ > > Cheers, bob > > > On Aug 9, 2017, at 7:54 AM, 'Pascal Jasmin' via Programming > > <[email protected]> wrote: > > > > in j806, 9999999999999999.310000000000000000 probably the j805 behaviour > > is preferred. If only for consistency. But there may be a good reason for > > change. > > > > From: robert therriault <[email protected]> > > To: Programming forum <[email protected]> > > Sent: Wednesday, August 9, 2017 10:40 AM > > Subject: [Jprogramming] Integer-floating type change for large numbers in > > j805 and j806 > > > > I am guessing that the following has something to do with precision of > > large numbers in j805 and is also true for j806. > > > > (; datatype) 999999999999999.3 > > ┌────┬────────┐ > > │1e15│floating│ > > └────┴────────┘ > > (; datatype) 9999999999999999.3 > > ┌─────────────────┬───────┐ > > │10000000000000000│integer│ > > └─────────────────┴───────┘ > > (; datatype) 99999999999999999.3 > > ┌──────────────────┬───────┐ > > │100000000000000000│integer│ > > └──────────────────┴───────┘ > > (; datatype) 999999999999999999.3 > > ┌───────────────────┬───────┐ > > │1000000000000000000│integer│ > > └───────────────────┴───────┘ > > (; datatype) 9999999999999999999.3 > > ┌────┬────────┐ > > │1e19│floating│ > > └────┴────────┘ > > JVERSION > > Engine: j805/j64/darwin > > Release: commercial/2016-12-11T08:17:56 > > Library: 8.05.14 > > Qt IDE: 1.5.4/5.6.2 > > Platform: Darwin 64 > > Installer: J805 install > > InstallPath: /applications/j64-805 > > Contact: www.jsoftware.com > > > > Further investigation shows me it was not this way with the 32 bit version > > of j701, so it may be an artifact of moving to 64 bit? > > > > (; datatype) 999999999999999.3 > > ┌────┬────────┐ > > │1e15│floating│ > > └────┴────────┘ > > (; datatype) 9999999999999999.3 > > ┌────┬────────┐ > > │1e16│floating│ > > └────┴────────┘ > > (; datatype) 999999999999999999.3 > > ┌────┬────────┐ > > │1e18│floating│ > > └────┴────────┘ > > (; datatype) 9999999999999999999.3 > > ┌────┬────────┐ > > │1e19│floating│ > > └────┴────────┘ > > JVERSION > > Engine: j701/2011-01-10/11:25 > > Library: 7.01.088 > > Platform: Darwin 32 > > Installer: j701a_mac_intel.dmg > > InstallPath: /Applications/j701 > > > > Cheers, bob > > > > > > > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > > > > > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm -- regards, ==================================================== GPG key 1024D/4434BAB3 2008-08-24 gpg --keyserver subkeys.pgp.net --recv-keys 4434BAB3 gpg --keyserver subkeys.pgp.net --armor --export 4434BAB3 ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
