Note that explicit verbs are a special case of tacit verbs. In the case of explicit verbs, the data structure which represents the verb represents an explicit definition. For example: [: : - is a tacit definition, while 4 : 'x - y' is an explicit definition.
In most cases, tacit verbs will have to be re-evaluated "for each record". (The exception would be if relevant special code existed for the tacit verb). -- Raul On Sun, Jan 8, 2012 at 10:19 PM, Ric Sherlock <tikk...@gmail.com> wrote: > For explicitly defined verbs/functions yes they'll need to be > reinterpreted for each record. I think I'm right in saying that if the > verb/function is tacitly defined then that is not the case (someone > correct me if I'm wrong!). > > On Mon, Jan 9, 2012 at 2:36 PM, Tom Szczesny <tav...@gmail.com> wrote: >> What surprised me was that the code in cutl was being reinterpreted by the >> J-interpreter for each element. >> I guess that's because the the conjuction is applied to a defined function, >> and not a primitive. >> >> >> On Sun, Jan 8, 2012 at 5:06 PM, Ric Sherlock <tikk...@gmail.com> wrote: >> >>> To be precise cutl is being "fed" csvfile one record at a time by the >>> conjunction cut ( ;. ). ( cutl;._2 ) will chop its right argument into >>> bits using the last item of the right argument (probably a line-feed) >>> as the record delimiter (fret) and apply the verb u (in your case ( >>> ','&cutl ) to each of those records. >>> >>> http://www.jsoftware.com/docs/help701/dictionary/d331.htm >>> >>> On Mon, Jan 9, 2012 at 6:50 AM, Tom Szczesny <tav...@gmail.com> wrote: >>> > >>> > ',' &cutl;._2 csvfile >>> > >>> > I was amazed that cutl loops through csvfile one 'record' at a time, >>> > as none of the 9 control structure patterns listed in the Primer were >>> > evident. >>> > >>> > >>> > >>> > On Mon, Jan 2, 2012 at 12:44 PM, Joey K Tuttle <j...@qued.com> wrote: >>> > >>> >> I believe that there are a collection of csv related utilities in addons >>> >> ( require 'csv' will make those available to you). >>> >> >>> >> However, for years I have used a simplistic verb to bring .csv files >>> >> into a j session as a table of enclosed values - >>> >> >>> >> cutl =: 3 : 0 >>> >> : >>> >> y =. y,x >>> >> q =. y e.'"' >>> >> qs =. ~:/\q >>> >> }.^: ('"'&=@([:{.1:{.]))&.> (qs<y e.x) <;._2&((q<:qs)&#) y >>> >> ) >>> >> >>> >> tablecsv =: 3 : 0 >>> >> ',' tablecsv y NB. allows choosing an alternative delimiter >>> >> : >>> >> x &cutl;._2 y >>> >> ) >>> >> >>> >> >>> >> On 2012/01/02 09:22 , Tom Szczesny wrote: >>> >> > Some languages, like q, have a built-in command for reading, parsing, >>> and >>> >> > loading data from csv files: >>> >> > t: ("SSDIDSSIFFFIS";enlist ",") 0: `:/home/tom/t.csv >>> >> > >>> >> > Other languages, like a+, do not, and the user needs to write a >>> function >>> >> to >>> >> > read, parse and load data from csv files. >>> >> > >>> >> > > From a cursory review, it appears that j is in the a+ camp. >>> >> > Please confirm that such a facility does not exist in j, before I >>> start >>> >> > writing my own. >>> >> > >>> >> >>> >> ---------------------------------------------------------------------- >>> >> For information about J forums see http://www.jsoftware.com/forums.htm >>> >> >>> > ---------------------------------------------------------------------- >>> > For information about J forums see http://www.jsoftware.com/forums.htm >>> ---------------------------------------------------------------------- >>> For information about J forums see http://www.jsoftware.com/forums.htm >>> >> ---------------------------------------------------------------------- >> For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
