I believe echo is slightly different from smoutput: smoutput outputs to the J session, while echo outputs to stdout. This doesn't make a difference when *you*'re using JQt or Jconsole, but if Jconsole is started silently (which is possible right?) I think echo will output text while smoutput won't.
Louis > On 17 Dec 2016, at 06:07, bill lam <[email protected]> wrote: > > Doevents is mainly intended for single-thread applications. > For multi-threading application, it is less important. > > In single thread event driven applications, msgs/doevents can > jump to process any events. Eg, msgs inside a tight loop can > interrupt and abort if users press the close button. > > That said, msgs is useful since J is single threaded and so > it is implemented in J wd. > > Пт, 16 дек 2016, Raul Miller написал(а): >> Why do you claim wd'msgs' is bad practice in J? >> >> The only reasoning I can find would imply that use of J is bad >> practice, and I refuse to agree with that kind of thinking. >> >> (More specifically, the criticisms of "doevents" which I find seem to >> be aimed at using fine grained multi-threading and flow of control. >> But that makes it sound using wd'msgs' would be *good practice* in the >> context of J. Still, perhaps I have overlooked something?) >> >> Thanks, >> >> -- >> Raul >> >> >>> On Fri, Dec 16, 2016 at 8:12 PM, bill lam <[email protected]> wrote: >>> wd'msgs' is the equivalent of doevents() in visual basic and dotnet >>> winform. It is a bad practice and can cause unpredictable behaviors. >>> Android does not support it. Try other alternatives first. >>> >>> That said, using it in Michael's context should be ok. Writing to file as >>> suggested by Eric is a more general solution. >>> >>> >>> On 17 Dec, 2016 6:07 am, "'Pascal Jasmin' via Programming" < >>> [email protected]> wrote: >>> >>> a slightly different version of echo (that returns argument instead of i.0 >>> 0) >>> >>> pD =: (1!:2&2)`(wd bind 'msgs' ] 1!:2&2)@.IFQT >>> echo =: (0 0 $1!:2&2)`(wd bind 'msgs' ] 0 0 $ 1!:2&2)@.IFQT >>> >>> works "universally" >>> >>> 3 : 'i =. 0 while. i < y do. if. 0 = 1000000 | i do. pD i end. i =. i+1 >>> end.' 10000000 >>> >>> >>> ----- Original Message ----- >>> From: Eric Iverson <[email protected]> >>> To: Programming forum <[email protected]> >>> Sent: Friday, December 16, 2016 4:40 PM >>> Subject: Re: [Jprogramming] How can I echo characters to JQT terminal >>> window each time through a loop? >>> >>> This is a perennial problem. Jconsole and JHS will show echo output before >>> execution completes, but Jqt won't. There may be Jqt mechanisms, such as >>> other windows, and special wd commands that would work. In my experience >>> the best general solution to this problem is to have the loop where you >>> currently have the echo, do an fwrite or fappend of status information to a >>> file. Then, while the big update is running, a completely separate task can >>> inspect the file contents. This is easy to do, works on all front ends, >>> works on all platforms, and supports logging info that wouldn't easily fit >>> into echo. In your case just replace the echos with an appropriate fwrite >>> of formated data. >>> >>>> On Fri, Dec 16, 2016 at 3:22 PM, Michael Berry <[email protected]> wrote: >>>> >>>> I am looping through a large database table 1,000 rows at a time and I >>>> would like to show some reassuring output. I tried echo and smoutput (are >>>> these different?) but both sat there until the whole explicit definition >>>> ended and then printed out the progress notes all at once. Do I need some >>>> sort of flush output command? >>>> >>>> Here is the loop I tried: >>>> >>>> while. 0 = _1 -: d=. ddfch sh, 1000 NB. ddfet fails unpredictably so use >>>> ddfch instead >>>> >>>> do. >>>> >>>> data=. make_cells d NB. put into ddfet format as expected by run_tests >>>> >>>> scores=. run_tests data >>>> >>>> r=. make_cols data,. <"1 scores >>>> >>>> assert. 0 = ch2 ddins~ ('select * from ',y,'_scored where 0=1');r >>>> >>>> echo written=. written + 1{. $data >>>> >>>> end. >>>> ---------------------------------------------------------------------- >>>> 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 > > -- > regards, > ==================================================== > GPG key 1024D/4434BAB3 2008-08-24 > gpg --keyserver subkeys.pgp.net --recv-keys 4434BAB3 > gpg --keyserver subkeys.pgp.net --armor --export 4434BAB3 > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
