Well I previously reported it to beta. So here it is again. To determine the inverse of factorial uses D: . In J807 forcing a deliberate error give the following:
! inv 0.001 |NaN error | (-(!-y"_)%0.001&*!"0 D:1])^:_<.&170^:(-:+)^.y In the middle of the magic function is D: . JVERSION Engine: j807/j64/windows Release-d: commercial/2019-03-18T13:21:35 Library: 8.07.26 Qt IDE: 1.7.10/5.9.7 Platform: Win 64 Installer: J807 install InstallPath: c:/j64-807 Contact: www.jsoftware.com ! inv 6 3 Works just fine in 807. But in latest beta ! inv 6 |domain error | !inv 6 JVERSION Engine: j901/j64avx/windows Beta-i: commercial/2019-08-29T09:48:23 Library: 9.01.09 Qt IDE: 1.8.3/5.12.3 Platform: Win 64 Installer: J901 install InstallPath: c:/j64-j901 Contact: www.jsoftware.com There is nothing about factorial inverse being dropped in the release notes. I don't know if the inverse of factorial should be dropped or not. But I have found it quite useful. ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
