Dear all - Thought I had succeeded in deducing step by step the tacit verb for factorial,
f=: 1:`(] * [: $: <:)@.* when I encountered this: f=. 1:`(] * [: $: <:)@.* f 2 3 5 7 2 6 120 5040 f 2 3 5 7 11 |rank error in f, executing monad $: | f 2 3 5 7 11 In contrast this seems to work alright: g=. 1:`(] * $: @ <:)@.* NB. dictionary entry g 2 3 5 7 2 6 120 5040 g 2 3 5 7 11 2 6 120 5040 39916800 JVERSION Engine: j9.4.2/j64avx2/windows Build: commercial/2023-04-10T01:19:53/clang-15-0-7/SLEEF=1 Library: 9.4.21 Platform: Win 64 Installer: j9.4 install InstallPath: d:/program files (non-sys)/j9.4 Contact: www.jsoftware.com However, my verb f=: 1:`(] * [: $: <:)@.* f 2 3 5 7 11 13 2 6 120 5040 39916800 6227020800 works under v8.07 as expected .... Could somebody shed some light on this ? -M ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
