Does I.inv have a working implementation? I'd expect the domain to be any ascending sequence of positive whole numbers (possibly with repeats):
3 4 9 e.~ i.10 0 0 0 1 1 0 0 0 0 1 I. 3 4 9 e.~ i.10 3 4 9 I. (i.@:>:@(>./) e. ]) 3 4 9 NB. hypothetical I.inv, doesn't handle repeats 3 4 9 But anything I throw at it gives me a domain error: I.inv 3 4 9 |domain error | I.inv 3 4 9 What am I missing? ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
