In 30 minutes we will close the mailman forums and set up the new
forum. This should take an hour or so.
Relevant pages:
migration overview: https://code.jsoftware.com/wiki/System/Forums/Migration
new forum archives: https://groups.google.com/a/jsoftware.com/g/forum
new forum wiki page: https:/
Thanks for the information. Much appreciated.
I didn’t get the chance to converse all that much with him.
Still, I miss his humor.
On 29/12/2023 18:07, Eric Iverson wrote:
Don Knuth's current work in progress is: "The Art of Computer Programming
Volume 4 Fascicle 7" with publication expected in
Don Knuth's current work in progress is: "The Art of Computer Programming
Volume 4 Fascicle 7" with publication expected in 2024.
See the oft-changing draft at: https://cs.stanford.edu/~knuth/fasc7a.ps.gz
Roger Hui's essay https://code.jsoftware.com/wiki/Essays/Queens_and_Knights
is referenced in
JVERSION
Engine: j9.5.1/j64avx2/darwin
Build: commercial/2023-12-20T04:08:21/clang-14-0-0/SLEEF=1
Library: 9.5.5
Platform: Darwin 64
Installer: j9.5 install
InstallPath: /usr/local/etc/j9.5
Contact: www.jsoftware.com
And sorting by itself along would crash JEngine
p =. 8 2 $ 0 0 1 1 1 0 0 0
Brian wrote:
> I got the editing window open using ".o
but I don't see a save option, or a run option or a load option from there.
The ⌘ button (top-left) drops a menu of "File" items. Tap: More… -(the last
item) to see the full menu (scrollable by finger-drag).
One of those items is Redirect ⇧⌘S
Also, perhaps unsurprisingly,
~.@:/:~ p
crashes jqt in my Windows 11 installation of J 9.5
Strangely enough,
~./:~ p
seems not to crash; however the results are inconsistent, and usually wrong!
Bill's assertion about the bug being related to the Boolean
type appears to hold in this insta
getclip'' returns '' before any text has been placed on the
clipboard (i.e. cut or copied).
It looks like it's not working on your kit. Can you copy/paste text either
way between other apps besides jios?
As I tried to make clear, I know nothing about the feature except
(a) it works between my Ma
I got a similar result. I believe this bug is related to the boolean
argument.
coercing the array to integer can work correctly.
p =. 00 + 8 2 $ 0 0 1 1 1 0 0 0 0 1 1 0 1 0 0 0
On Thu, Dec 28, 2023 at 6:02 PM Marcin Żołek <
marcin.zo...@students.mimuw.edu.pl> wrote:
> Hello,
> I was trying to ru
Hello,
I was trying to run my code on j9.4 Linux, j9.4 MacOS, j9.5 MacOS and it
crashes.
In terminal
/Applications/j9.5/bin/jconsole bug.ijs < input.txt
JE has crashed, likely due to an internal bug. Please report the code which
caused the crash, as well as the following printout, to the J prog
All,
I would like to attend the Thursday J Wiki meetings. How do I get an invite
to those meetings?
Skip
Skip Cave
Cave Consulting LLC
On Thu, Dec 28, 2023 at 12:05 AM 'robert therriault' via General <
gene...@jsoftware.com> wrote:
> == Report of Meeting 2023-12-14 ==
>
> Present: Art Anger,
== Report of Meeting 2023-12-14 ==
Present: Art Anger, Ed Gottsman, Raul Miller, and Bob Therriault
Full transcripts of this meeting are now available on the its wiki page.
https://code.jsoftware.com/wiki/Wiki/Report_of_Meeting_2023-12-14
1) Ed reported that he had removed the time slider as i
Ian (et al),
I tried your getclip'' experiment. When I execute getclip'' , the return
was . There was no alert at the desktop, asking for my permission
to paste, I got the same .
And then when I enter "myfoldtext" on jios I see "4 : " . So maybe
I'm doing something wrong.
I have successfully e
@ Brian
You say you don't use iCloud, and you've given up on iOS Files app.
You're denying yourself the most robust way to move J scripts between your
iOS device and your Mac.
And (probably) the easiest to setup and use. Though that may not be saying
much.
If I had 10 coders in my team, I'd put on
Just a reminder that we will move the forums to a single Google Group
fo...@jsoftware.com over the New Year.
We plan to shut down the current Mailman forums at midnight UTC Dec 31
and then try to enroll subscribers to the new forum. I think most
emails should work, but there are likely to be some
Glad that was useful.
You mention copy & paste. Ian will have wise things to say about this,
which I won't understand, but one of the things that "appears" to
wipe my Jios ipad installation is copy from elsewhere or from the J session
itself, and paste into a J edit session, even when bra
That sort of summarizes my question quite well ...
Thanks.
-Martin
At 2023-12-27 02:01, you wrote:
Uh... but before I can sensibly update the wiki I need to understand
what I am talking about.
0:`1:`2:@.(3&|) i. 6
0 1 2 0 1 2
0:`1:`2:@.(3&|) i. 7
|rank error, executing monad (0:`1:
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$?6
What would a general "find the index of the value x in the array y" verb
named fixv look like?
It would work like this:
] p=.3 4 5$?60$50
10 49 11 0 4
39 33 34 32 38
49 24 43 36 41
1 21 11 14 27
7 28 38 9 26
24 42 39 12 3
8 28 33 1 4
46 40 7 49 0
10 8 49 37 39
5 45 46 39 6
7 38 32 2
Uh... but before I can sensibly update the wiki I need to understand
what I am talking about.
0:`1:`2:@.(3&|) i. 6
0 1 2 0 1 2
0:`1:`2:@.(3&|) i. 7
|rank error, executing monad (0:`1:`2:)@.(3&|)
|each gerund must return a result whose shape agrees with its inputs
| 0:`1:`2:@.(3&|
This is related to the question I asked several days ago,
http://jsoftware.com/pipermail/programming/2023-December/062994.html
My suggestion would be
8 (($@])#:[i.~,@]) A
1 3
Although you might want to an alternative behavior when there are
multiple matches.
LdBeth :)
> In
> Davi
8 ($@] #: [ I.@:= ,@]) A
1 3
8 (4 $. $.@:= ) A
1 3
Note that both of these results are rank 2.
--
Raul
On Tue, Dec 26, 2023 at 8:32 PM David Pinchbeck wrote:
>
> Having trouble finding this in the wiki: I know that we can select from a
> table using a boxed pair
>
> A
>
> 0 1 2 3 4
>
>
Having trouble finding this in the wiki: I know that we can select from a
table using a boxed pair
A
0 1 2 3 4
5 6 7 8 9
10 11 12 13 14
15 16 17 18 19
20 21 22 23 24
(<1 3){A
8
How do I write a verb f to do the reverse, so that
8 f A
yields the result 1 3 ?
Thanks,
David
--
David Pinc
Mike and Ian,
Mike, your answer was very helpful because I could not get the iphone to be
recognized by my desktop Mac when I tried to link them with a USB cable (I
don't use icloud). An error keeps occurring, so I gave up on the ios files
app. But your mention of a folder creation button made me
The result of v contains verb numbers for the cells of x/y. It also
indicates the rank of those cells: the verbs execute on (-rv)-cells,
where rv is the rank of the result of v.
The text seems to me to describe the operation correctly, but as always
you can change it if it is unclear. Your d
However you'd do it in jqt, it's worth trying the same in jios. If
something doesn't work, it's usually not the fault of jios but the bizarre
paranoid iOS directory system, which prioritizes security over convenience
and takes getting used-to.
As a general rule, paths beginning: 'j/' are the most
I should add that the nuvoc has some examples of implied rank, but I
can't figure out why a list of 10 numbers from an infinite ranked v
means rank 0 while a list of five numbers from infinite ranked v means
rank 1. I suspect what it's intended to mean is that the implied rank
is _1 and "_1 on a ra
It's not clear to me why this is a rank error.
2&|i.5
0 1 0 1 0
0:`1:@.0 1 0 1 0
0: 1: 0: 1: 0:
(0:`1:@.0 1 0 1 0) i.5
1
That said, this line from nuvoc might be the issue:
"The implied rank of m@.v y is the rank of y minus the rank of v y. y
is then split into cells of that rank, and t
Don't know about iphone, but I've got a couple of folders/directories
under ~user in my iPad installation of Jios; here's the official info:
JVERSION
Engine: j903/j64/iOS
beta-k: GPL3/2023-04-16T23:21:00
Platform: iOS/iPadOS
Version: 903.2 57
Installer: App Store
Contact: www.jsoftware.com
I
Can the user create a subdirectory under j/user and fill it with .ijs files
in j90x on iphone?
Thanks,
--
(B=)
--
For information about J forums see http://www.jsoftware.com/forums.htm
See https://code.jsoftware.com/wiki/System/ReleaseNotes/J902
Henry Rich
On 12/26/2023 3:11 PM, Devon McCormick wrote:
I don't know about the history but in 9.5.5 (under Windows 10):
(0:`1: @. (2&|)) i.4
0 1 0 1
On Tue, Dec 26, 2023 at 7:44 AM Martin Kreuzer wrote:
Dear all -
This left
I don't know about the history but in 9.5.5 (under Windows 10):
(0:`1: @. (2&|)) i.4
0 1 0 1
On Tue, Dec 26, 2023 at 7:44 AM Martin Kreuzer wrote:
> Dear all -
>
> This left me puzzled today; have I missed some developments ?
> (all in Console on Windows10)
>
> - v8.07 -
>
> (0:`1: @. (2
Dear all -
This left me puzzled today; have I missed some developments ?
(all in Console on Windows10)
- v8.07 -
(0:`1: @. (2&|)) i.1
|rank error
| (0:`1:@.(2&|))i.1
- v9.0.1 -
(0:`1: @. (2&|)) i.1
|rank error
| (0:`1:@.(2&|))i.1
- v9.0.2 -
(0:`1: @. (2&|)) i.4
0 1 0
Season's Greetings. Thanks to everyone who tried the J Viewer, and
particularly to those who submitted bug reports and feature requests. I
believe I've addressed all of the former and I'm working my way through the
latter.
Highlights:
The past month saw many minor bug fixes and performance
Since stdlib is not updated for older versions of J, addons that
depend on the J version will have to use their own test like your
original jversion function.
Alternatively, set the addon manifest RELEASE for 9.4 or later and
just support the new version number. The 9!:14 result is then parsed
in
I've a better idea.
Establish a new system flag called (say) VERSION_z_ and assign it within
stdlib.ijs (c/f IFJHS or JLIB) the integer form of the J version (currently
this would be VERSION_z_ = 951).
Then ~addons/math/cal/cal.ijs, or some other utility with a version
dependency, could test for
Compare the x-axes in
'bar'plot (;?.)p:i.10
and
'marker'plot (;?.)p:i.10
The second one gives the correct x-axis, the first one gives >:i. of the
x-values.
R.E. Boss
--
For information about J forums see http://www.jsof
Hi Devon -
Thanks for your help -- much appreciated.
I had a hunch when I saw this expression (%:n**:a).
But as part of it (n**:a) turned up as well in the calculation for (r')
I tackled the compound fraction using pen and paper
to make shure that formula was correct.
Then I changed the line f
David Zwitser is an artist who is using the BQN array language to create games.
On this episode of the ArrayCast we explore his views on Art, Games and
exploring computing as a non-computer scientist.
Host: Conor Hoekstra
Panel: Marshall Lochbaum, Adám Brudzewsky, Stephen Taylor and Bob Therriau
I tested the revised code and it works properly for the examples, returning *_4
1 11;3 12* for *qcf 10 _1 _3 2* whereas the older version gives the same
result (*0;12 3*) for both *qcf 10 _1 _3 2* and *qcf 10 1 _3 2*.
I edited the body of *qcf* to remove the commented out line that Martin
revised s
You are welcome. By the way, I just noticed that nc could be redefined as,
nc=. >:@:
Best wishes on your recovery
On Fri, Dec 22, 2023 at 1:35 PM Martin Kreuzer wrote:
> @Raul | @Pepe -
>
> Sorry for the delay.
> I was ill for quite some time (slowly recovering).
> Thanks for your detailed a
Hi all -
(This wasn't an easy one for me, as I still very much miss him.)
I have been into CF for some time and re-read the essay this morning.
It looks as there was a small glitch (maybe typo) in the body of function *qcf.
May I ask you (having much more experience than me) to have a look at
@Raul | @Pepe -
Sorry for the delay.
I was ill for quite some time (slowly recovering).
Thanks for your detailed answers.
With season's greetings
-Martin
At 2023-06-13 21:11, you wrote:
Exactly: "(extra parentheses and spaces for clarity)"
On Tue, Jun 13, 2023 at 2:27â¯PM Raul Miller wrote
When I was doing topo sort, it was for a sort tree that did one
comparison per node. You were asking about comparisons that are more
complex than simple numeric comparison.
For the topo sort, the comparison was essentially the sign of the volume
of a pyramid after a 3D rotation.
For pruning
To Raul
-
In the early stage of development, in windows, the install directory is
defined as Users home directory. But it turned out that there can be a
space character ' ' in the name of home directory, such as
'c:\Users\yuji suda', this never happens in MacOS and Linux where
To LdBeth
-
The source scripts are in two zip files.
making_basic_ver_0_1.zip for simple server and client system to test
infinite core loop for server socket communication
making_ver_0_1.zip for web form server system based on
server core loop with http protocol
For toposort, though, you'd presumably want a cleverer strategy than just
sorting the nodes, doing a full graph traversal on each comparison.
Alpha-beta pruning I don't know about.
On Thu, 21 Dec 2023, Henry Rich wrote:
Topological sorting was a big topic in graphics back in the day.
I can i
Topological sorting was a big topic in graphics back in the day.
I can imagine that during alpha -beta pruning you might run into some
ordering requirements that require more than simple keys.
Henry Rich
On Thu, Dec 21, 2023, 9:56 PM Elijah Stone wrote:
> > The problem it has is that if elemen
Hmm... only if we're updating stdlib, supporting versions of J back to
4.0.1. A worthwhile effort, though, if someone was actually tackling
those issues.
Otherwise, I think an idiom would be about as good as it gets.
--
Raul
On Thu, Dec 21, 2023 at 9:24 PM Ian Clark wrote:
>
> For those of us
Oh yeah, unicode collation! That's a fun time.
Floats is annoying. You should probably get a choice of invalid operation
exception on nan or straight sign-magnitude interpretation (which is
consistent with ieee total order). But I do concede that either way you
probably want special code fo
> I am curious what applications there are that really need a user-specified
> comparison function (rather than just a sort key, like dyadic /: takes).
There must some applications out there with some sort of smart string
ordering that couldn't be reduced to array ordering. And of course in a
lang
On Thu, 21 Dec 2023, Marshall Lochbaum wrote:
This is a stable algorithm
Yeah--it's the naive in-place version that's unstable.
--
For information about J forums see http://www.jsoftware.com/forums.htm
The problem it has is that if elements compare equal but don't match then
it'll never get down to an array where ~.y has length 1.
Right, of course. Shame on me for being lazy and not bothering to write out
*./2 u/\y.
Modern quicksort hybrids ... always use one bit at a time.
I am curious
This is a stable algorithm because it only ever changes the order of
elements if one's less than the pivot and the other isn't. The problem
it has is that if elements compare equal but don't match then it'll
never get down to an array where ~.y has length 1. You get a stack error
on (<&:*qs _1 2 3)
You can get a three-result comparison from a boolean c by using it
twice, (c-c~). See https://www.jsoftware.com/papers/50/50_00.htm . If
this fails to distinguish elements then they are equivalent under the
ordering, so a stable algorithm has to maintain their input order.
It's my opinion that sor
For those of us digital archaeologists running back-levels of J, it would
be nice to have a robust test for a given version of J or later which
tolerates versions down to 4.01, say.
What represents best-practice? The best I can come up with is:
jversion=: 3 : 0
". 'j.' -.~ '/' taketo 9!:14''
Comment on testing web form server sample application in j9.5.1 just
released
-
If the web form server system is tested in the latest j9.5.1, the
definition file has to be revised to require addons 'bmp' and 'png'
in the sample application of 52_hokusai_komon_image_galary_j9_5
The same output of your quoted "program"
\:~ _10 1 10 20 _30 15 25 30 0
30 25 20 15 10 1 0 _10 _30
I may have misunderstood your original question, based on subject line. You
appear to want to sort card hands.
You would want to encode cards as integers, where 2-A maps to 0-13. It is a
good
Yeah, I was talking about a stable quicksort, like we see at
https://code.jsoftware.com/wiki/Essays/Quicksort
I guess if you don't care about search stability you can eliminate the
equality test against the pivot value.
Thanks,
--
Raul
On Thu, Dec 21, 2023 at 5:07 PM Elijah Stone wrote:
>
> T
The quicksort I know does not care whether elements are out of order.
Example:
qs=. {{ NB.quicksort adverb; u compare, y array
if. 1>:#~.y do. y return. end. NB.ignore ~.
p=. y{~?#y
s=. y u"_1 _ p
(u qs s#y) , (u qs (-.s)#y) }}
It is unstable, but that is to be expected. And it can be mad
It's probably worth noting here that (for example) the quicksort
algorithm relies on being able to tell whether items are equal. And a
0 1 result can't distinguish between ordering and equality. Many
sorting implementations rely on a _1, 0, 1 result, as a consequence.
That said, you could implemen
I tried to start jqt from the desktop shortcut, after I install J on macOs, but
it fail to start.So I tried to recompile jqt for macOs.
First I tried to install Qt from source, but fail.Then i use the Qt online
installer for macOS, and install the Qt version 6.5.3.Just follow the Guide to
compil
Did you use winget or AIO? I think the install is either in your home
folder or in the windows system folder for program files. In any case, if
you get J running, the following might help:
jpath'~install'
On Wed, Dec 20, 2023 at 9:24 PM Devon McCormick wrote:
> I followed the Windows installa
(/: verb-to-put-cards-in-order) table-of-hands
For poker, verb-to-put-cards-in-order is
vtpcio =. '23456789TJQKA'&i.
(/: vtpcio) _5 ]\ 'A22345323452'
23452
23453
2
A
Henry Rich
On 12/21/2023 10:29 AM, 'Viktor Grigorov' via Programming wrote:
The first example is lesser, m
The first example is lesser, my bad!
Dec 21, 2023, 15:27 by programm...@jsoftware.com:
> I have a list that I would like to sort using a verb that outputs 0 or 1,
> depending on the two items compared. Since there are length-1 factorial
> possible pairings and hence booleans, I'd thought of th
I have a list that I would like to sort using a verb that outputs 0 or 1,
depending on the two items compared. Since there are length-1 factorial
possible pairings and hence booleans, I'd thought of the table.
Here, the items are hands of playing cards. One hand is greater than another,
if at a
I don't understand the problem statement.
Henry Rich
On 12/21/2023 10:17 AM, 'Viktor Grigorov' via Programming wrote:
Maybe a table, summation and a sort using that:
(/: ([:+/(>/]))) _10 1 10 20 _30 15 25 30 0
Can't imagine that being efficient, but it's better than nothing. The verb I'd
Maybe a table, summation and a sort using that:
(/: ([:+/(>/]))) _10 1 10 20 _30 15 25 30 0
Can't imagine that being efficient, but it's better than nothing. The verb I'd
defined can't deal with rank 2 nouns anyways.
Dec 21, 2023, 14:21 by programm...@jsoftware.com:
> Not quite though. Had I
Not quite though. Had I 5 hands, that'd be !4 booleans.
Dec 21, 2023, 14:11 by programm...@jsoftware.com:
>
> 1 0 0 1 0 /:~ i.5
>
> 1 2 4 0 3
>
>
> On Thursday, December 21, 2023 at 09:03:34 a.m. EST, 'Viktor Grigorov' via
> Programming wrote:
>
> Hey,
>
> Is there an easy way to sort an
1 0 0 1 0 /:~ i.5
1 2 4 0 3
On Thursday, December 21, 2023 at 09:03:34 a.m. EST, 'Viktor Grigorov' via
Programming wrote:
Hey,
Is there an easy way to sort an array with verb returning either 0 or 1, like
the comparison primitives?
The verb that I'd in mind relates to the 2023'
Hey,
Is there an easy way to sort an array with verb returning either 0 or 1, like
the comparison primitives?
The verb that I'd in mind relates to the 2023's advent of code's day 7: given
two equal length hands, which one has the first high card. Which one can write
as:
'K2345' ( 2 | 0 {
android J9.5.1 release available at
* http://www.jsoftware.com/download/j9.5/install/
On Thu, Dec 21, 2023 at 3:20 AM Eric Iverson
wrote:
> J9.5.1 release available
>
> If you were running the 9.5 beta, do a full install to get everything and
> have a clean slate. Do not just do an engine upgrad
Does typing JVERSION help?
On Thu, Dec 21, 2023 at 10:24 Devon McCormick wrote:
> I followed the Windows installation instructions and I think it worked but
> I can't tell and I have to guess where it was installed since there is no
> helpful message at the end saying something like "Successfull
I followed the Windows installation instructions and I think it worked but
I can't tell and I have to guess where it was installed since there is no
helpful message at the end saying something like "Successfully installed at
location XYZ" or whatever.
On Wed, Dec 20, 2023 at 2:20 PM Eric Iverson
J9.5.1 release available
If you were running the 9.5 beta, do a full install to get everything and
have a clean slate. Do not just do an engine upgrade.
https://code.jsoftware.com/wiki/System/Installation/J9.5
https://code.jsoftware.com/wiki/System/ReleaseNotes/J9.5
The 9.6 beta starts in earl
This looks interesting, though it will take some time for me to digest
adequately.
One thing which occurs to me is that
begin_simple_server_or_client_jconsole.ijs and
begin_simple_server_or_client_jconsole_wsl.ijs in the making_basic
directory could be combined into a single script, though there
Very interesting framework, the install process required for source
package I found from
https://www.smccake.net/japla/making_basic_ver_0_1.zip
seems has a deviation from the description in PDF, that is,
assume the 'making/' dir in downloaded zip is unpacked to $HOME,
boot Jconsole in $HOME and
Hello everyone
I am Yuji Suda from Sendai, Miyagi, Japan.
Recently I have developed and implemented a web form server system in J
and Jsocket for adding forms to Jconsole funtion. It was presented in
the Workshop of JAPLA
http://japla.sakura.ne.jp
on 8 December 2023.
The abstract is as f
There's actually several issues here, one being the parsing issue
Henry has highlighted.
Another is a difficulty in reproducing the problem:
f=: {{ GLOBAL=: 'global defined here' }}
GLOBAL [ f''
|domain error in GLOBAL, executing monad GLOBAL
| GLOBAL[f''
GLOBAL [ f''
global defin
This follows the parsing rules.
f is executed when the pattern
N V V N
is seen on the execution stack. GLOBAL has already been stacked at that
point, as an undefined verb. When later GLOBAL is to be executed, its value
has been changed to a noun. That pun is disallowed.
Henry Rich
On Sun, Dec
$ ijconsole
f=: {{ GLOBAL=: 'global defined here' }}
GLOBAL [ f''
|domain error in GLOBAL, executing monad GLOBAL
| GLOBAL[f''
GLOBAL [ f''
global defined here
JVERSION
Engine: j9.5.0-beta9/j64avx2/linux
Build: commercial/2023-12-06T14:16:14/clang-11-0-0/SLEEF=1
Library:
Thanks, Bill. As JVERSION shows, it's Windows 11 Home, version 22H2.
"Settings" wants to do an update, "2023-12 cumulative update ..."; I won't do
that
now as it's late. Bit busy tomorrow, but I might manage to do the update and
see
whether it helps.
Cheers,
Mike
Sent from my iPad
>
The latest base library is 9.5.5 so yours has been updated.
It uses windows stock curl.exe for http fetch therefore certificates come
from windows. Did you get windows update?
On Fri, Dec 15, 2023 at 03:59 'Michael Day' via Programming <
programm...@jsoftware.com> wrote:
> I'm still getting an e
The base library is indeed in addons.
And, you can edit httpget_jpacman_ to show you the urls it's fetching
(and, thus, the url it's failing on).
That said, I remember seeing https certificate errors a few days ago,
so I expect that jsoftware is experiencing a hosting issue.
I hope this helps,
I'm still getting an error, reported earlier for beta 7 (msg copied
below), when using upgrade - still can't
see why. The laptop has been through many on/off switches, so it's not
a transient error.
I think I've updated to beta9 by using the zip file. Jversion info
follows my sign-off. I s
== Report of Meeting 2023-12-07 ==
Present: Ed Gottsman, Raul Miller, and Bob Therriault
Full transcripts of this meeting are now available on the its wiki page.
https://code.jsoftware.com/wiki/Wiki/Report_of_Meeting_2023-12-07
1) Ed reported that he can now get Skip Cave's answers to Quora in
I appreciate your effort demonstrate on how to derive reusable code in J.
It is important to know how to adapt existed solutions for different needs.
To me knowing that I can use the shape of the array to decode (#:) indices
generated by I. is a good enough respond to my question. So I also tha
The array and verb were an example; didn't want to copy anybody's array and
boolean mask.
A general purpose solution, to me, is a verb (that generates the mask), not an
explicitly defined noun, lines above. It's how I've saved the snippet in my
snippets file, and how I use it. Plug-and-play, or
Sorry, Viktor, but I don't see your point.
(>:i.8)* 8 8 $ 1j2 # 1
generates an integer array, not a Boolean.
I agree (5&=) yields a boolean, but is it in any way a general-purpose
condition?
You might note that Henry Rich proposed the same solution to LdBeth's
enquiry.
He (HR) might under
A fully tacit solution would encapsulate the predicate too, here parenthesized
for emphasis:
($ #: [: I. [: (5&=) ,) (>:i.8)* 8 8 $ 1j2 # 1
4 1
4 4
4 7
Dec 11, 2023, 17:01 by programm...@jsoftware.com:
> I see Pablo has just replied, but here's a similar/same approach, as a tacit
> expr
I see Pablo has just replied, but here's a similar/same approach, as a tacit
expression:
b =. 0=3|i.2 3 4
($#:I.@,) b
0 0 0
0 0 3
0 1 2
0 2 1
1 0 0
1 0 3
1 1 2
1 2 1
Might be of use,
Mike
Sent from my iPad
> On 11 Dec 2023, at 10:06, LdBeth wrote:
>
> I've been running to too many s
It's expected. If you kept the sparse element at 0 the matrix would
become dense.
3 $. -. $. 3 3 $ _4 {. 1
1
3 $. 1 - $. 3 3 $ _4 {. 1
1
3 $. 2 - $. 3 3 $ _4 {. 1
2
3 $. % $. 3 3 $ _4 {. 1
_
Henry Rich
On 12/11/2023 11:53 AM, David Lambert wrote:
$ ijconsole
JVERSION
Engine:
$ ijconsole
JVERSION
Engine: j9.5.0-beta9/j64avx2/linux
Build: commercial/2023-12-06T14:16:14/clang-11-0-0/SLEEF=1
Library: 9.5.5
Platform: Linux 64
Installer: unknown
InstallPath: /usr/share/j/9.5
Contact: www.jsoftware.com
]A=: 3 3 $ _4 {. 1
0 0 0
1 0 0
0 1 0
3 $. $. A
0
3 $. -.
($ #: I.@,) y
Henry Rich
On 12/11/2023 5:06 AM, LdBeth wrote:
I've been running to too many situations that I uses 4$.$.y a lot to
get indexes of all non zero elements to an array, I wonder if there
are any alternative ways to do that in J, especially when y is a
boolean array.
Also monadi
index =: $ #: [: I. ,
index ? 2 4$2
0 0
1 0
1 3
index ? 2 4 5$2
0 0 0
0 0 1
0 0 2
0 0 3
0 1 1
0 2 1
0 2 3
0 2 4
0 3 2
1 0 0
1 0 1
1 0 2
1 0 4
1 1 1
1 1 3
1 2 1
1 2 2
1 2 4
1 3 0
1 3 1
1 3 2
On Mon, Dec 11, 2023 at 11:06 AM LdBeth wrote:
> I've been running to too many
I've been running to too many situations that I uses 4$.$.y a lot to
get indexes of all non zero elements to an array, I wonder if there
are any alternative ways to do that in J, especially when y is a
boolean array.
Also monadic I. only works for 1D array, while ⍸ from APL works
for higher d
I'll open with
(2 3 $ <@|:@(6 5&($!._))@:>:@I."1@|.)&.|: #: >: i. 60
+-+-+
|1 11 21 31 41 51 | 8 13 26 31 44 57|
|3 13 23 33 43 53 | 9 14 27 40 45 58|
|5 15 25 35 45 55 |10 15 28 41 46 59|
|7 17 27 37 47 57 |11 24 29 42 47 60|
|9 19 29 39 49 59 |12 25 30 43 56
https://ibb.co/XLn0bxH
The each of the 6 cards is missing a number that is present in the
remaining 5 cards.
By asking a player a number is present in the card or not, the number can
be deducted. Eg, 55 is missing in the top left card.
The problem is to generate all 6 cards in J.
, December 9, 2023 4:46:50 PM
> To: programming
> Subject: Re: [Jprogramming] Advent of code newbie
>
> Hi Richard,
>
> What part of the display do you find difficult to read? Is it contrast or
> font size or colour or layout? If you are on a Mac you have a lot of control
> o
Bill, I would like to see the J android user folder move as you suggested on
12/04/23. Thanks, Tom Arneson
> On 12/04/2023 11:44 PM CST bill lam wrote:
>
>
> Good observation. I am also thinking of moving the user folder to public
> location such as download folder so that J scripts will be
> From: Programming on behalf of
> 'robert therriault' via Programming
> Sent: Saturday, December 9, 2023 4:46:50 PM
> To: programming
> Subject: Re: [Jprogramming] Advent of code newbie
>
> Hi Richard,
>
> What part of the display do you f
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