On 2007.10.22 03:38:04, you, the extraordinary metaperl.j, emitted: > Because ? and ?. seem to share a manpage: > http://www.jsoftware.com/help/dictionary/d640.htm > > And the monadic description never says anything about ?. > I have no idea how monadic ? and ?. differ.
I don't know much about the inner workings of random number generators, but the fact that ?. uses a 'fixed seed' is illustrated at the surface thus: '(?.X) -: ?.X' is necessarily true, and '(?X) -: ?X' is not necessarily true. e.g. ?10#10 0 7 8 9 2 2 5 5 5 3 ?10#10 8 0 0 5 9 6 4 0 6 4 ?10#10 9 8 5 7 4 0 1 2 7 9 ?.10#10 6 5 9 2 4 9 0 7 0 4 ?.10#10 6 5 9 2 4 9 0 7 0 4 ?.10#10 6 5 9 2 4 9 0 7 0 4 (I hope that insomnia hasn't made me assert a falsehood :-) -- Nollaig MacKenzie http://www.yorku.ca/nollaig ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
