Hi, I think I have found a bug in J 9.4 that appears to be present for a while (e.g. also in the J Playground):
(1 1,:_2 2) <;._3 i. 3 3 NB. rows reversed +---+---+ |3 4|4 5| |0 1|1 2| +---+---+ |6 7|7 8| |3 4|4 5| +---+---+ (1 1,:2 _2) <;._3 i. 3 3 NB. columns reversed +---+---+ |1 0|2 1| |4 3|5 4| +---+---+ |4 3|5 4| |7 6|8 7| +---+---+ (1 1,:_2 _2) <;._3 i. 3 3 NB. rows and columns reversed? |limit error, executing dyad <;._3 |a system limit was exceeded | (1 1,:_2 _2) <;._3 i.3 3 JVERSION Engine: j9.4.1/j64arm/android Build: commercial/2023-03-02T04:40:32/clang-14-0-7/SLEEF=1 Library: 9.4.22 J Android: 1.4.60/13/33 Platform: Android 64 (arm64-v8a) Installer: unknown InstallPath: /storage/emulated/0/Android/data/com.jsoftware.j.android/files Contact: www.jsoftware.com J9.5 beta 3 gives the same result (limit error) In the J playground, that last one somehow eats rows/columns at the edges: https://jsoftware.github.io/j-playground/bin/html2/#code=%281%201%2C%3A_2%20_2%29%20%3C%3B._3%20i.%203%203 I expect rather this result: (1 1,: 2 2) <@:(|."1)@|.;._3 i. 3 3 +---+---+ |4 3|5 4| |1 0|2 1| +---+---+ |7 6|8 7| |4 3|5 4| +---+---+ Jan-Pieter ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
