Hi, I also support the idea of this scalar extension.
#.inv or #.^:_1 have a "kludgy" feeling ... Jimmy On Tue, Jul 3, 2018 at 11:31 PM, Joey K Tuttle <[email protected]> wrote: > Can anyone provide a reason it would be undesirable to have a scalar left > (x) argument to #: behave any differently than x (#.^:_1) y ? > > In NuVoc I find - " > x #: y is used only when you need to state how many places you want in the > result, or if x contains differing values. If you want just sufficient > places to hold the value of y in the base x, use #.inv to convert to a > fixed base. > > #.inv is the same as #.^:_1 . > " > A scalar extension of x is applied in expression x #. y and scalar > extension of the default 2 in the monodic forms of both #. and #: > > So why discriminate against other base values by not extending a scalar > left argument? > > I think this would be a useful scalar extension and make sense when > explaining #: and #. to students. > > Here are some simple examples around what I'm talking about. > > #: 1234 NB. special case within special case?? > 1 0 0 1 1 0 1 0 0 1 0 > #. 1 0 0 1 1 0 1 0 0 1 0 > 1234 > > NB. Base 10 is pretty common for most of us. > > 10 #. 1 2 3 4 > 1234 > 10 #: 1234 > 4 > 10 (#.^:_1) 1234 > 1 2 3 4 > 10 10 10 #: 1234 > 2 3 4 > 10 10 10 (#.^:_1) 1234 > 2 3 4 > (,10) (#.^:_1) 1234 > 4 > 10 (#.^:_1) 6?.20000 > 1 6 1 9 4 > 1 4 3 2 6 > 0 3 3 4 2 > 1 1 2 2 0 > 1 7 5 4 1 > 1 5 1 0 8 > > NB. other bases can be fun too e.g. > > 29r3 (#.^:_1) 6?.20000 > 1 22r3 26r3 8r3 7r3 > 1 16r3 8 3 0 > 0 3 6 20r3 7 > 1 7r3 4 0 20r3 > 1 28r3 10r3 19r3 17r3 > 1 19r3 19r3 17r3 26r3 > > I can't imagine any broken applications resulting from extending scalar x, > but I'm all ears for hearing about one. > > Well, I guess if you really wanted the modulo of a number and used #: > instead of | then you would need to make the left argument be a vector (or > just replace #: by | ) but ... since - > > (29r3 #: 6?.20000) -: 29r3 | 6?.20000 > 1 > > would anyone suffer from losing that identity? > > > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
