With p defined as
p=.3 4 5$?.60$50 NB. ?.
33 (($@])#:[(I.@:=),@]) p
0 2 0
2 1 1
2 3 1
~ Gilles
Le 2023-12-26 à 21:06, 'Skip Cave' via Programming a écrit :
What would a general "find the index of the value x in the array y" verb
named fixv look like?
It would work like this:
] p=.3 4 5$?6
>>> What expression allows a function to recieve an argument 'y' as a
literal
>>> without using quotes?
None.
BTW, do not rely on the output of ": (default format) to determine the
type, because it uses a default format with a default precision. Use
datatype instead.
datatype 18054804326
Say I have
]d=: _2 ]\ 'q1';'19.4';'q2';'878.34000';'q3';'200.3634'
+--+-+
|q1|19.4 |
+--+-+
|q2|878.34000|
+--+-+
|q3|200.3634 |
+--+-+
(]`(". each) "0) d
+--+---+
|q1|19.4 |
+--+---+
|q2|878.34 |
+--+---+
|q3|200.363|
+--+---+
The fol
Ah! ah!
(,: datatype each) ]`(".each)"0 list
┌───┬───┬───┬┬───┬┐
│foo│1 │bar│2.17│baz│3.14│
├───┼───┼───┼┼───┼┤
│literal│boolean│literal│floating│literal│floating│
└───┴───┴───┴┴
Thanks for many different solutions. There is indeed more than one way
to skin a cat!
Raul's monadic hook with Insert appears as a natural tool for this
problem. Why didn't I think of it?!
Henry's use of L: is surely an invitation to have a closer look at
conjunction Level At.
~ Gille
I have two character strings :
datatype each 'abc';'13.2'
┌───┬───┐
│literal│literal│
└───┴───┘
I want to convert the second one into numerical data
datatype each (<@:])`(<@:".)"1 >'abc';'13.2'
┌───┬┐
│literal│floating│
└───┴┘
Can you simplify the a
In J805
w=: <'200'
abc_200_=: 123
In J901 +
abc_200_ =: 123
|locale error
| abc_200_=:123
That is perhaps a change documented in the Release Notes of J901, but I
am unable to find those notes.
Step 66 of Lab Locales in J904 still says:
A numbered locale name can be used
Richard
If you are looking for the trace script, it is in
addons\general\misc
See also
https://wiki.jsoftware.com/wiki/Guides/Language_FAQ/TracePhrase
~ Gilles
Le 2022-10-24 à 01:45, Richard Donovan a écrit :
Many years ago (J4 or J6) I remember there was a function that showed how
1-c fnotes below each table
2-c main text could be smaller (see note below)
3-c footnote text could be smaller
4-c I like the coloration
5-d adv names are helpful and cj should have similar
6- don't know. See how it was summarized in the J6.02 Ref Card.
7- Is the use of alternating background gr
To see the full list of digits, use the standard utility foldpara.
$a=: ": */ 1 + i.450x
1001
100 foldpara a NB. line length of 100
https://code.jsoftware.com/wiki/Standard_Library/Overview
In jqt, the above page is loaded with Help->Standard Library
The standard utilities are autom
In j9.03, the Help menu item Release Notes loads the j9.02 page instead
of the 9.03 one.
JVERSION
Engine: j903/j64/windows
Release-b: commercial/2022-01-28T04:17:43
Library: 9.03.08
Qt IDE: 1.9.5/5.15.2(5.15.2)
Platform: Win 64
Installer: J903 install
InstallPath: c:/users/mouton/j903
Contact
Meino
Once you have a working explicit definition,
myfn=: 4 : 'y #~ (0=x|y)'NB. 4 for dyadic def
3 myfn 3 5 6
3 6
the interpreter can help you get the tacit form with 13 : def
myfn=: 13 : 'y #~ (0=x|y)'
myfn
] #~ 0 = |
~ Gilles
Le 2022-07-07 à 10:57, 'robert therriault' via P
The Window Driver wd is normally not available in jconsole, which you
are using.
wd rests on the QT environment and is available with the J QT ide.
wd itself is defined in addons/ide/qt/qt.ijs.
To use wd in jconsole, you need to have the QT environment available.
To learn more, start here
e.jsoftware.com/wiki/Vocabulary/Constants#Extended_Integers
Having said that, it is hidden pretty well and most of its references are
previous documentation on the jsoftware site. There is certainly work to be
done on the wiki!
Cheers, bob
On Apr 21, 2022, at 11:44, Gilles Kirouac wrote:
Ed
You
Ed
You seem unaware of the extended precision constant notation:
"digits with a trailing x denote an extended precision integer"
https://www.jsoftware.com/help/dictionary/dcons.htm
[Where is the equivalent in NuVoc?]
I would rather write
1x + *: 9x
82
~ Gilles
Le
We are working on a J9 version
GREAT!
Sergey's sheet is nice and well designed.
But IMO it is for a somewhat experienced J programmer, while the old
J6.02 Reference Card had details and __examples__ useful to the newcomer
e.g. Format. It is dense, can be printed and posted. Thanks to Henry
Standard Library is also an item of the Help menu in JQT.
~ Gilles
Le 2022-02-02 à 18:03, chris burke a écrit :
I didn't even know there was a standard library
The standard library docs are linked from System on the wiki left menu:
https://code.jsoftware.com/wiki/Standard_Library/Overview
O
Does this page help?
https://code.jsoftware.com/wiki/NYCJUG/2012-05-08
See Merge-Sort Examples.
~ Gilles
Le 2021-10-05 à 12:03, Adrien Mathieu a écrit :
Hello,
I am a beginner, and I would like to know if there is a way to write
mergesort without using loops, or an ugly translation of loops
Concerning the Toggle Comment Ctl+/ and Toggle Note Ctl+Shift+/ features
With my French-Canadian keyboard driver, I can do Ctl+/ using
Ctl+Shift+3 since / is uppercase 3 on that kb.
But Toggle Note poses a problem. Some Russian and Serbian images likely
have a similar problem.
Is there a wo
Perfect upgrade!
histogram does not lead to lost data any more.
_5 0 5 histogram _2 _7 0 3 9
1 1 2 1
Thanks, Ric, for all future users.
~ Gilles
Le 2021-05-19 à 08:01, Raul Miller a écrit :
Yes.. I should have been reading the updated code, rather than the commits.
It's been too long sin
Could you please tell me what I would need to change to fix the
following little J program (e.g., how to replace %. with a call
to LAPACK)?
You should read
https://code.jsoftware.com/wiki/Vocabulary/LAPACK
~ Gilles
Le 2021-04-29 à 14:29, Henry Rich a écrit :
%. does not use SVD
Thanks to Brian and Ric for their major improvements and in particular
for Brian's Histogram wiki page. I was neither asking nor hoping for so
much.
Both are interesting. I find specially useful the visual representation
of the importance of each interval.
If there was a way to paint interva
About the histogram verb in stats/base
NB. The result is a list of counts of the number of data points in each
interval.
Intervals are specified by the left argument. histogram uses dyadic I.
The I. primitive defines (1+#x) intervals. See its clear definition
in Nuvoc. In short, it
This topic has been discussed before:
http://www.jsoftware.com/pipermail/programming/2018-November/052287.html
Another way to learn is to study J Phrases, specially section 4.B.,
accessible through Help, Vocabulary, Phr.
~ Gilles
Le 2020-11-13 à 15:00, R.E. Boss a écrit :
$.$.M
0 0 │ 1
load jpath '~addons/debug/jig/jig.ijs'
^.
It seems the tilde is required here.
~ Gilles
Le 2020-05-01 à 12:56, 'robert therriault' via Programming a écrit :
> load jpath 'addons/debug/jig/jig.ijs'
-
dbnxt (13!:5) works, 13!:21 does not.
h=: 3 : ('t=. 2 3*y'; '1+t'; 't')
dbr 1
3 4,h 5 6 7
|length error: h
| t=.2 3 *y
|h[0]
t=.99
13!:21 ''
|length error
* t=.2 3 *y
|h[0]
13!:5 ''
|stop
* 1+t
|h[1]
13!:5 ''
3 4 99
JVERSION
Engine: j901/j64avx/wi
The N0 V1 V2 sequence was introduced in release 6.02:
https://www.jsoftware.com/docs/help602/release/nvv.htm
As for the manywithdrawn bidents and tridents, that was with release 5.01:
https://www.jsoftware.com/help/user/previous504.htm look for "fork"
However the Release Notes page which
Thomas
To avoid the dependency on Linux, without changing your syntax, I
redefined epochtime as:
NB.create a time stamp [of type character]
NB. epochtime'1/1/2019'
NB.1546318800
epochtime =: 3 : 0
":18000+86400*62091-~todayno _1|.".;._1 '/',y NB.normalized yr mn dy
)
and I removed the two c
Why can't such a class be implemented using s: Symbols?
It does calculate hashes and seems appropriate for dictionaries.
What is deficient in the implementation of s: ?
Why a new hash function?
~ Gilles
Le 2019-11-18 à 08:09, Henry Rich a écrit :
> Right now I am thinking that the need for dictio
I am studying the webio script
(https://code.jsoftware.com/wiki/Scripts/Socket_System).
I tried using the first example, but it fails using gethostbyname
because xlatecache has not been defined.
It seems that no sockmux object was created, thus preventing the
initialize verb to run.
After launchi
select, is atypical socket programming, and may be
> decommitted in future releases."
>
> So we will decommit it now.
>
> On Sun, Nov 3, 2019 at 2:19 PM Gilles Kirouac wrote:
>
>> In J805, j806 and current beta for Windows, sdasync defined in
>> socket.ijs has the
In J805, j806 and current beta for Windows, sdasync defined in
socket.ijs has the line:
hwnd=. ".wd'qhwndx'
but qhwndx is not a valid command, resulting in "command not found".
~ Gilles
--
For information about J forums see htt
The recent thread on odds and nths made me review the Cut conjunction
doing tessellation, i.e. case ;._3 .
About the tile size, both the Vocabulary and the NuVoc page specify
that an infinite size can be used:
Voc : an infinite size being replaced by the signed length of the
corresponding ax
Josh
To understand or write tacit programming, one must master the basic
elements just as a carpenter must know everything of a saw, a hammer, a
screwdriver.
To me, the basic elements of tacit are: @, @:, & (Compose), &:, fork,
hook, hook with ~ (e.g. u~v). [ and ] are also essential but they are
In addition to Roger Hui's writings ...
The math/mt addon has equation solving in pure J. You may get useful
info there too.
https://code.jsoftware.com/wiki/Addons/math/mt
Doing an exact forum search on "matrix inverse" reveals 67 quotes.
You may also look at foreign conjunction 1
How about multiply a and b, followed by a branch on zero?
~ Gilles
Le 2019-07-28 à 20:51, Henry Rich a écrit :
> Many of the members of this Forum will remember the days of assembler
> language
>
> ...and who could less than merry be
> when writing out BXLE?
>
> AND, OR, XOR were our meat. T
or (not as simple)
c=: (128!:2)&.><
g c"0 y
┌─┬───┬─┐
│9│0.5│1│
└─┴───┴─┘
Try removing "0
Le 2019-05-02 à 22:35, 'Rob Hodgkinson' via Programming a écrit :
> Hi Piet, not ignorant at all !
>
> Try using oblique (an obscure feature is that the u in u/. can be a gerund,
> in which case it is
Thomas
The proposed solution makes a conversion from numerical to characters:
datatype smoutput ":123 NB. smoutput displays arg and
123 NB. returns empty of the same type
literal
You could also separate the digits and keep them as integers with
Antibase-Base:
datatype s
Did you have a look at Oleg Kobchenko's (old) page?
http://olegykj.sourceforge.net/
The xml parser addon is there.
~ Gilles
Le 2018-08-27 à 21:58, bill lam a écrit :
readme.txt contains minimalist documentation, but perhaps you had already
read it.
On Tue, Aug 28, 2018, 1:28 AM Raul Miller
To define alpha1 as a dyadic verb, use
alpha1=: 4 :'y /: <./x i."1 _ y' NB. 4 instead of 3
~ GIlles
Le 2018-08-07 à 03:46, Linda Alvord a écrit :
I can't seem to get messages to the forum. Here's a problem in J806
a=:'abcdefghijklmnopqrstuvwxyz'
A=:'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
aA=:
I had j806/j64/windows, I installed Python 3.6.4 today for my single use
(rather than all users).
I then had difficulty with "import j".
"put j.py and j_config.py where python can find them"
I initially placed them with other scripts under Tools\scripts, but that
did not work.
Putting them in the
1(0,+/\}.20 10 12)}42$0 NB. mask for length 10 12 20
1(0,+/\}:20 10 12)}42$0 NB. Drop last, not first; for 20 10 12
Le 2017-11-17 à 00:24, Daniel Lyons a écrit :
> Thanks Rob!
>
> I did feel that the general idea of the rolling sum generating the indices of
> the frets was not terrible, it ju
a=:(0 0, 2 _3 ,: _1 2)
a
0 0
2 _3
_1 2
]b=:1 1,_1 _2,:3 4
1 1
_1 _2
3 4
a(4 :'+/ &.: *:x-y' "1)b NB. Under since Square Root is obverse
(inverse) of Square
1.41421 3.16228 4.47214
a((+/ &.: *:)@: -) "1 b NB. in a tacit way
1.41421 3.16228 4.47214
a([: (+/ &.: *:) -
Depending on your requirements (the browser used by users), you could
consider Server-Sent Events, an alternative to websockets, but they are
not supported in IE neither (yet?) in Edge.
In HTML5, Server-Sent Events are probably what you need. Have a look at
the following with a clock example in PH
Raul was right: a font issue.
Qt IDE has no deficiency.
Thanks for all suggestions.
~ Gilles
Le 2017-02-21 à 08:24, 'Pascal Jasmin' via Programming a écrit :
> working with html, a pre tag enclosing the entire copied session is likely to
> format it "right". Your editor may have a "blockquo
With the Qt IDE under MS-Win, I would like to document my session output
in a text processor.
When I copy and paste a boxed display, the lines are distorted as we see
in this forum.
Is there a solution? I could replace the Box-Drawing Characters with
those proposed in Global Parameter 9!:7 giving
>>> J805 will NOT support J32 for linux and mac.
This is about a bug in J804 for linux32 which crashes J.
===
[gilles@NetV03 j804]$ bin/jconsole
Adv=: 1 : 0
u
y
(
)
13!:0 ]1 NB. Reset and activate debugger
+ Adv 2
|syntax error: Adv
|
Bill
On https://curl.haxx.se/download.html ,
under Win32 - generic, the third line is
Win327zip 7.50.3 binary SSL Darren Owen
leading to
http://winampplugins.co.uk/curl/
The offered downloads "have been built with OpenSSL, ngttp2 and IPv6
support" and are based on the most recent
John
You don't say much about the problem (error type...).
Curl supports https.
If it has to do with a rejected SSL certificate, google (curl https)
proposes the following url:
http://stackoverflow.com/questions/10079707/https-connection-using-curl-from-command-line
The discussion t
I use the addon web/gethttp to get a page off the net. Unless you have
peculiar needs (like login first), this is the ready-made solution.
You can get the page as the result of the gethttp verb or
have it put in a file.
~ Gilles
-- Original Message ---
From: Joe Bogner
The first train I used has been given by Chris: getting the shape and
the value (in a console, when you don't have a fancy GUI à la Dyalog).
($;]) a
┌─┬─┐
│1│0│
└─┴─┘
But, Daniel, have you looked at the Phrases? You'll find hundreds of
them classified by application type in about fift
Joe
Here is another suggestion.
Learn J by example: READ well written J scripts.
Library and system scripts are generally such good examples.
~ Gilles
--
For information about J forums see http://www.jsoftware.com/foru
> Why do I get a domain error? Are sparse arrays not implemented for extended
> integers?
On the page you refer to (d211.htm), one can read:
"A sparse array y may be boolean, integer, floating point, complex, literal,
or boxed ...".
No extended integers here.
You may also look at 3!:0,
Is great Visual Studio integration for J desirable? Definitely yes.
J using an enriched APL character set? I am not so sure.
Devon said it and I agree. IMO, APL characters for J is not
such a good idea.
At first glance, it appears doable and attractive to those who
have got used to
On my Linux system, the following will play a wave file
in a bash shell:
mplayer tata.wav NB. Check the doc of mplayer
Using the task script, you could call mplayer from J:
load'task'
_1 fork_jtask_ 'mplayer tata.wav'
shell 'mplayer tata.wav'
Both will play a .w
Henry
Did you look at 9!:32 33?
It may not have the wanted granularity under Windows though.
~ Gilles
-- Original Message ---
From: Henry Rich
To: Programming forum
Sent: Wed, 19 Sep 2012 16:30:33 -0400
Subject: [Jprogramming] Execution with time limit
> I have uses for
The first time I saw
;: ^: _1
was in a solution offered by Ewart Shaw a long time ago
(before 1998, since it is not in the current archives).
My reply was: Wow!
One may be using J for years and still someday discover such pearls.
~ Gilles
--
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