Re: [Jprogramming] Stop command when testing
Hi, Don! On 11/27/20, Don Kelly wrote: > That is fine- it is something from "TEurbo Basic" and implemented in APL > , in a way.and is very useful, but it only works if you detect, during > coding, when to deal with a problem due, often, to coding errors. What > is needed is an interrupt outside of J (as an interrupt optio may not be > available-except through a command to windows to stop.(alt crtrl del). I used it because it was in NuVoc as well as in the old Vocabulary's Control Structures. (I know very little about using APL and its ins and outs.) I think of myself as an advanced beginner and pretty much stick to about half of the possible primitives, mostly because I have no need of a lot of the higher math primitives. What I continue to learn about the primitives that I know are further applications and nuances of those primitives. After 14 years of programming in J, I don't ever recall encountering a J "meltdown"/crash or a "runaway" program--"knock on wood". (A runaway program, of course, would require an external interrupt of some kind.) Thanks for your comments! Harvey -- For information about J forums see http://www.jsoftware.com/forums.htm
[Jprogramming] Merging (amending?) two different data files
Hello again! Another stock market related question: I need to merge the data of two different data files on the basis of common dates. QUESTION 1 -- I know that I can use a "for." loop, but I was wondering if there was perhaps a better (perhaps faster?), more J-like approach. The basic idea is matching dates in a smaller file against a fuller set of dates in a larger file and, if the dates match, to append/merge/amend the value in the smaller file in with the data of the larger file for that date (see data examples below). QUESTION 2 -- I don't know how Excel handles J files, but is it better to add a column of empty values to Data set A to amend into (with alphabetic letters) or to have a column of spaces into which to amend alphabetic letters? Here are sample data to illustrate what I'm trying to do: Data set A consists of sequential calendar dates, daily lows, and daily highs. Data set B consists of dates on which either a top (T) or bottom (B) occurred. Data set C is the merged/amended result: dates, lows, highs, and T/B's (if any) Data set A: 2015-01-14,153.74,156.49 2015-01-15,154.16,156.97 2015-01-16,153.82,157.63 2015-01-17,, 2015-01-18,, 2015-01-19,, 2015-01-20,154.03,157.33 2015-01-21,151.07,154.50 2015-01-22,151.76,155.72 2015-01-23,154.89,157.60 2015-01-24,, 2015-01-25,, 2015-01-26,155.77,159.46 2015-01-27,152.59,155.09 2015-01-28,151.55,154.53 2015-01-29,149.52,155.58 2015-01-30,153.04,155.24 Data set B: [merged/amended with A to form C] 2015-01-16,T 2015-01-21,B 2015-01-26,T 2015-01-29,B Data set C: [final result] 2015-01-14,153.74,156.49, 2015-01-15,154.16,156.97, 2015-01-16,153.82,157.63,T 2015-01-17,,, 2015-01-18,,, 2015-01-19,,, 2015-01-20,154.03,157.33, 2015-01-21,151.07,154.50,B 2015-01-22,151.76,155.72, 2015-01-23,154.89,157.60, 2015-01-24,,, 2015-01-25,,, 2015-01-26,155.77,159.46,T 2015-01-27,152.59,155.09, 2015-01-28,151.55,154.53, 2015-01-29,149.52,155.58,B 2015-01-30,153.04,155.24, The reason I mentioned a possible speed difference between a "for." loop and something else is that it's quite possible for Data set B above to have large distances between matches which could result in a lot of wasted time checking for matches when there were none. (I chose this example because it showed several matches within a small number of dates. Other data sets could be significantly different.) Even if a "for." loop is perhaps the best approach, I do still need to know an answer to the second question--which is more typical for a blank, empty column: empty values (such as a:) or single spaces? In this case, the other possible values in this column would be scattered values of "T" (top) and "B" (bottom). I appreciate any help with this! Harvey -- For information about J forums see http://www.jsoftware.com/forums.htm
Re: [Jprogramming] Stop command when testing
That is fine- it is something from "TEurbo Basic" and implemented in APL
, in a way.and is very useful, but it only works if you detect, during
coding, when to deal with a problem due, often, to coding errors. What
is needed is an interrupt outside of J (as an interrupt optio may not be
available-except through a command to windows to stop.(alt crtrl del).
I would like to know
Don
On 2020-11-26 8:54 p.m., HH PackRat wrote:
I figured out how to do what I wanted:
. . .
. . .
goto_stop.
. . .
. . .
label_stop.
)
The name "stop", of course, can be any label name you wish. In
effect, this pattern can be used to "rem out" (remark out) any portion
of code that you don't want executed at a particular moment of
testing. I presume, as well, that you could conceivably have more
than one of these pairs as long as the labels ("stop" in this case)
are different. (However, I am by no means an expert in J concerning
the latter point.)
Harvey
--
For information about J forums see http://www.jsoftware.com/forums.htm
--
For information about J forums see http://www.jsoftware.com/forums.htm
Re: [Jprogramming] Stop command when testing
I figured out how to do what I wanted:
. . .
. . .
goto_stop.
. . .
. . .
label_stop.
)
The name "stop", of course, can be any label name you wish. In
effect, this pattern can be used to "rem out" (remark out) any portion
of code that you don't want executed at a particular moment of
testing. I presume, as well, that you could conceivably have more
than one of these pairs as long as the labels ("stop" in this case)
are different. (However, I am by no means an expert in J concerning
the latter point.)
Harvey
--
For information about J forums see http://www.jsoftware.com/forums.htm
Re: [Jprogramming] Stop command when testing
on windows it is in bin subfolder to J installation. On Thursday, November 26, 2020, 10:05:08 p.m. EST, Don Kelly wrote: that is fine-but when a J program is running wild- how do I bring up "break.bat"? I would like to know how to do this, other than ctrl alt-del and then shut down J. Don Kelly On 2020-11-26 4:30 p.m., 'Pascal Jasmin' via Programming wrote: > there is also a "break" utility (break.bat in windows) which will stop a > "runaway" program/function when executed.. > > > > > > > On Thursday, November 26, 2020, 06:10:10 p.m. EST, chris burke > wrote: > > > > > > Use dbstopme to stop at a specific line, see the example below. A > non-empty argument is a test, so stop if true. > > Caution: if using 902 beta, get the latest beta and qt addon, as there > have been recent updates to debug. > > foo=: 4 : 0 > a=. 2 + y > dbstopme'' > b=. a * 5 > x + b > ) > > dbg 1 > 2 foo 3 > > On Thu, Nov 26, 2020 at 2:20 PM HH PackRat wrote: >> I could have sworn that, a couple of months ago, someone posted some >> code that included a "stop" command of some sort in explicit coding, >> but I can't remember how it was done. I cannot find such a command >> anywhere in NuVoc. Searching the wiki brought back the >> "Vocabulary/JBreak" ancillary page, which referred only to the desktop >> icon for basically stopping a "runaway" program. >> >> What I'm looking for is a J command of some type (something like >> "stop." or some synonym). As I'm testing a program, I often want to >> stop ever so often without executing the entire program. "break." and >> "end." obviously don't work, since J won't even load a program that >> doesn't use those words correctly as part of a larger construction. >> >> All I want to do is stop the program in the middle without using a >> deliberate error (such as "13!:8 2") and without continuing to the end >> of the program. I would appreciate any help with this! >> >> Harvey >> -- >> 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
Re: [Jprogramming] Stop command when testing
that is fine-but when a J program is running wild- how do I bring up "break.bat"? I would like to know how to do this, other than ctrl alt-del and then shut down J. Don Kelly On 2020-11-26 4:30 p.m., 'Pascal Jasmin' via Programming wrote: there is also a "break" utility (break.bat in windows) which will stop a "runaway" program/function when executed.. On Thursday, November 26, 2020, 06:10:10 p.m. EST, chris burke wrote: Use dbstopme to stop at a specific line, see the example below. A non-empty argument is a test, so stop if true. Caution: if using 902 beta, get the latest beta and qt addon, as there have been recent updates to debug. foo=: 4 : 0 a=. 2 + y dbstopme'' b=. a * 5 x + b ) dbg 1 2 foo 3 On Thu, Nov 26, 2020 at 2:20 PM HH PackRat wrote: I could have sworn that, a couple of months ago, someone posted some code that included a "stop" command of some sort in explicit coding, but I can't remember how it was done. I cannot find such a command anywhere in NuVoc. Searching the wiki brought back the "Vocabulary/JBreak" ancillary page, which referred only to the desktop icon for basically stopping a "runaway" program. What I'm looking for is a J command of some type (something like "stop." or some synonym). As I'm testing a program, I often want to stop ever so often without executing the entire program. "break." and "end." obviously don't work, since J won't even load a program that doesn't use those words correctly as part of a larger construction. All I want to do is stop the program in the middle without using a deliberate error (such as "13!:8 2") and without continuing to the end of the program. I would appreciate any help with this! Harvey -- 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
Re: [Jprogramming] Stop command when testing
there is also a "break" utility (break.bat in windows) which will stop a "runaway" program/function when executed.. On Thursday, November 26, 2020, 06:10:10 p.m. EST, chris burke wrote: Use dbstopme to stop at a specific line, see the example below. A non-empty argument is a test, so stop if true. Caution: if using 902 beta, get the latest beta and qt addon, as there have been recent updates to debug. foo=: 4 : 0 a=. 2 + y dbstopme'' b=. a * 5 x + b ) dbg 1 2 foo 3 On Thu, Nov 26, 2020 at 2:20 PM HH PackRat wrote: > > I could have sworn that, a couple of months ago, someone posted some > code that included a "stop" command of some sort in explicit coding, > but I can't remember how it was done. I cannot find such a command > anywhere in NuVoc. Searching the wiki brought back the > "Vocabulary/JBreak" ancillary page, which referred only to the desktop > icon for basically stopping a "runaway" program. > > What I'm looking for is a J command of some type (something like > "stop." or some synonym). As I'm testing a program, I often want to > stop ever so often without executing the entire program. "break." and > "end." obviously don't work, since J won't even load a program that > doesn't use those words correctly as part of a larger construction. > > All I want to do is stop the program in the middle without using a > deliberate error (such as "13!:8 2") and without continuing to the end > of the program. I would appreciate any help with this! > > Harvey > -- > 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
Re: [Jprogramming] Stop command when testing
Use dbstopme to stop at a specific line, see the example below. A non-empty argument is a test, so stop if true. Caution: if using 902 beta, get the latest beta and qt addon, as there have been recent updates to debug. foo=: 4 : 0 a=. 2 + y dbstopme'' b=. a * 5 x + b ) dbg 1 2 foo 3 On Thu, Nov 26, 2020 at 2:20 PM HH PackRat wrote: > > I could have sworn that, a couple of months ago, someone posted some > code that included a "stop" command of some sort in explicit coding, > but I can't remember how it was done. I cannot find such a command > anywhere in NuVoc. Searching the wiki brought back the > "Vocabulary/JBreak" ancillary page, which referred only to the desktop > icon for basically stopping a "runaway" program. > > What I'm looking for is a J command of some type (something like > "stop." or some synonym). As I'm testing a program, I often want to > stop ever so often without executing the entire program. "break." and > "end." obviously don't work, since J won't even load a program that > doesn't use those words correctly as part of a larger construction. > > All I want to do is stop the program in the middle without using a > deliberate error (such as "13!:8 2") and without continuing to the end > of the program. I would appreciate any help with this! > > Harvey > -- > For information about J forums see http://www.jsoftware.com/forums.htm -- For information about J forums see http://www.jsoftware.com/forums.htm
[Jprogramming] Stop command when testing
I could have sworn that, a couple of months ago, someone posted some code that included a "stop" command of some sort in explicit coding, but I can't remember how it was done. I cannot find such a command anywhere in NuVoc. Searching the wiki brought back the "Vocabulary/JBreak" ancillary page, which referred only to the desktop icon for basically stopping a "runaway" program. What I'm looking for is a J command of some type (something like "stop." or some synonym). As I'm testing a program, I often want to stop ever so often without executing the entire program. "break." and "end." obviously don't work, since J won't even load a program that doesn't use those words correctly as part of a larger construction. All I want to do is stop the program in the middle without using a deliberate error (such as "13!:8 2") and without continuing to the end of the program. I would appreciate any help with this! Harvey -- For information about J forums see http://www.jsoftware.com/forums.htm
