It looks as if ! (Choose) in j901 does not want to accept extended integers in
its domain. If the arguments are equal then it will work, which looks like a
shortcut to the answer 1.
JVERSION
Engine: j901/j64avx2/darwin
Release-e: commercial/2020-01-29T12:41:32
Library: 9.01.24
Qt IDE: 1.8.3/5.12.3
Platform: Darwin 64
Installer: J901 install
InstallPath: /users/bobtherriault/j901
Contact: www.jsoftware.com
2 ! 2
1
2 ! 3
3
2 ! 3x
|domain error
| 2 !3
2 ! 2x
1
This works in j807
JVERSION
Engine: j807/j64/darwin
Release-d: commercial/2019-03-18T16:07:14
Library: 8.07.26
Qt IDE: 1.7.9/5.9.6
Platform: Darwin 64
Installer: J807 install
InstallPath: /users/bobtherriault/j64-807
Contact: www.jsoftware.com
2 ! 3
3
2 ! 3x
3
It seems to me that the ability to handle large numbers in combinatorics is
useful. I have not found any documentation in Nuvoc that suggests an
intentional change.
I await illumination. :-)
Cheers, bob
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
