Ambrus observed: > Phrases 8C. has this verb: > d0=: >:@<[EMAIL PROTECTED] NB. Length to represent y in base x > This verb is imprecise.
This is a bug. It may be related to (or the identical with) the one Raul reported in 2006: http://www.jsoftware.com/jwiki/System/Interpreter/Bugs06#head-253aeeae21360cdcfd8438613679821e0f3613f3 In any event, it causes the same symptom: 10&#.b._1 ($&10@>:@(10&(<[EMAIL PROTECTED]))@(1&>.)@(>./)@:|@, #: ]) :.(10&#.) 10 #.^:_1: 999999999999 0 9 9 9 9 9 9 9 9 9 9 9 9 (the inverse of #. should never produce leading zeros, as its definition prohibits them.) > Could you tell me what the best way to do this calculation correctly is? The fix for this problem is to have zero tolerance in the first place: d0m=: >:@(<.!.0)@^. 10 d0m 999999999999 12 10 #.^:_1:!.0] 999999999999 9 9 9 9 9 9 9 9 9 9 9 9 BTW, this leads to the insight that d0 may be rewritten: 10 #@:(#.^:_1:!.0) 999999999999 12 Here's another (unrelated) bug: 10 #.^:_1:!.0] 999999999999 9 9 9 9 9 9 9 9 9 9 9 9 10 #.^:_1 !.0] 999999999999 |domain error | 10 #.^:_1!.0]1e12 I'm surprised the latter phrase is an error; I share the suspicion Henry expressed here: http://www.jsoftware.com/pipermail/general/2007-November/031266.html because I know there there are several undocumented places !. works (which implies the interpreter uses the method Henry described), and because of this message: http://www.jsoftware.com/pipermail/general/2004-August/017959.html > Also, how does one report bugs in the Phrases? >From revision 5 (due to Henry) to revision 26 (due to Oleg), the Phrases page on the Wiki (*) had this to say: The J Phrases book contains a wealth of useful J idioms. It is no longer being maintained actively, and there is an ongoing project to move phrases from the book to the appropriate subpages here. I interpreted this to mean that the phrases shipped with J will no longer be corrected (e.g., I believe some still use dotted names). But since that page has changed, I was perhaps mistaken. If that's the case: http://www.jsoftware.com/jwiki/System/Library/Bugs or this Forum is probably your best bet. -Dan *: Current: http://www.jsoftware.com/jwiki/Phrases "Unmaintained" introduced: http://www.jsoftware.com/jwiki/Phrases?action=recall&rev=5 then removed: http://www.jsoftware.com/jwiki/Phrases?action=recall&rev=26 -- View this message in context: http://www.nabble.com/Number-of-digits-in-a-number-tf4898850s24193.html#a14032393 Sent from the J Programming mailing list archive at Nabble.com. ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
