Look in the "Files" lab. Years ago I fought the same battle. At that time the comments were still in "files.ijs" and I stole them to create the "files" lab. This was all before the J WIKI existed, so I wrote the lab in a reference style. Now it would be better to move the reference material to WIKI and keep just examples in the lab. One of these days.
On Mon, May 27, 2013 at 8:47 AM, Murray Eisenberg <mur...@math.umass.edu>wrote: > > On 26 May 2013 15:32:47 -0600, Don Guinn <dongu...@gmail.com> wrote: > > That does it; thanks! > > But how do you know about the optional 'b' argument of fread? I cannot > find documentation about fread at all -- either in J701 or J801 using > scriptdoc or in the help pages, included with J or on-line. > > Where did you find that documented? > > And if it's not in the documentation, is this something one is just > supposed to intuit, or know only if he's a member of some secret cult and > is told as part of initiation rites? > > > sortandprint=:4 : 0 > > > > text=.'b' fread y > > > > text=./:~text > > > > text=.text,&.>LF > > > > (;text) fwrite x > > > > ) > > > > > > The 'b' option means box each line. > > > > > > y is file to read, > > > > x is file to write sorted. > > > > > > If you are dealing with windows and need CRLF as a line separator, > replace > > the LF with <CRLF. > > > > > > On Sun, May 26, 2013 at 1:50 PM, Murray Eisenberg <mur...@math.umass.edu > >wrote: > > > >> I'm really out of practice with J, and the meager-to-nonexistent > >> documentation is not helping me. I have a very simple task to perform. I > >> have a text file infile.txt on my desktop and here's what I want to do: > >> > >> (1) read the file as lines (so I don't get all the end-of-line symbols); > >> (2) sort the file's lines (alphabetically) > >> (3) write out the result as a new text file, say outfile.txt, also on my > >> desktop. > >> > >> I can do this trivially in Mathematica: > >> > >> t = Import["~/Desktop/infile.txt", "Lines"] > >> Export["~/Desktop/outfile.txt", Sort[t]] > >> > >> But how would I do this in J (which, for longer files, ought to be > faster) > >> and how would I discover how to do it? I prefer to use named library > >> functions where applicable. > > --- > Murray Eisenberg mur...@math.umass.edu > Mathematics & Statistics Dept. > Lederle Graduate Research Tower phone 413 549-1020 (H) > University of Massachusetts 413 545-2838 (W) > 710 North Pleasant Street fax 413 545-1801 > Amherst, MA 01003-9305 > > > > > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
