Not sure if it will help with your Windows Defender issues but it might be
worth trying to install using the Windows commandline utility: winget
PS C:\Users\jblogs> winget search J-language
Name Id Version Source
---
J-language Js
As an adverb we can get the ascending and descending by applying either /:
or \:
open 'stats/base/univariate' NB. in JQt will open the script
rankCompete=: 1 :'u~ i. ]'
On Thu, Mar 16, 2023 at 1:30 PM Ric Sherlock wrote:
> There are number of adverbs in the stats/
There are number of adverbs in the stats/base script for getting different
types of rankings
NB.*rankOrdinal a ordinal ranking ("0 1 2 3") of array y
NB.*rankCompete a standard competition ranking ("0 0 2 3") of array y
NB.*rankDense a dense ranking ("0 0 1 2") of array y
NB.*rankFractional a f
Hi Giles,
Release notes for various J versions can be found on the wiki here:
https://code.jsoftware.com/wiki/System/ReleaseNotes
In the notes for J901 (
https://code.jsoftware.com/wiki/System/ReleaseNotes/J901) I can see the
following which might be what you are seeing? :
"Change in behavior of
Building on the inverted table defns
dfftbl=: {. ,: ifa@}.
tblfdf=: {. , afi@{:
tblfdf dfftbl B
┌──┬──┬──┬─┐
│Id│Name │Job │Status │
├──┼──┼──┼─┤
│3 │Jerry │Unemployed│Married │
├──┼──┼──┼─┤
│6 │Jan │CEO │Marri
It looks like you are trying to use the inverted Table format but with a
header row.
load 'tables/dsv general/misc/inverted'
({. ,: ifa@:}.) ',' readdsv 'test.csv'
┌──┬──┬──┐
│deptno│dname │location │
├──┼──┼──┤
│10│Accounting│"New York"│
│20
Hi David,
Thanks for the feedback. I agree that adding some additional text there may
help users trying to work out how to use the addon. Did you have a
suggested wording change in mind?
The function named will be called from within the 'pdeoptim' locale and so
needs to either be in the search pat
inities. It's proof territory.
> >
> > That said, typically we solve this kind of problem by hand, rather
> > than using a test on the structure of the verb.
> >
> > Good luck,
> >
> > --
> > Raul
> >
> > On Tue, May 3, 2022 at 5
I want to test if a particular verb was provided to my adverb.
I came up with the solution below. Is there a better way?
myadverb = {{
res=. u {:y
if. theverb f.`'' -: u f.`'' do.
res=. ({.y) ,: res
end.
res
}}
--
For
Hi Joe,
This is pretty slick!
I can confirm it appears to work fine for me on Windows 10 with Firefox.
It might be nice to provide a method for stopping the script?
I ended up refreshing the page to get it to stop.
On Thu, Mar 10, 2022 at 8:57 AM Raul Miller wrote:
> For people who want to tes
;query engine" (too simple to call it that) that takes a boolean
> function to filter records "on set of properties/fields"
>
> Basically an inverted table as a dictionary is a dictionary that only
> contains the properties corresponding to fields. Because kv can sto
mia.edu/10031088/ORDINAL_FRACTIONS_the_algebra_of_data
>
> Thanks!
>
> Bo.
>
> Den søndag den 13. februar 2022 14.49.06 CET skrev Ric Sherlock <
> tikk...@gmail.com>:
>
>
>
>
>
> Inspired by recent threads, I've started experimenting with a DataFrame
&g
Inspired by recent threads, I've started experimenting with a DataFrame
structure in J.
I began by building off the 'general/misc/inverted' utilities so that a
DataFrame is just a 2-row table, where the first row is a list of labels &
the 2nd is an inverted table.
It can be installed as 'tables/da
that functionality is still missing.
>
>
> On Wed, 2 Feb 2022 at 7:34 pm, Ric Sherlock wrote:
>
> > Thanks Aaron - that looks really promising. Will check it out & see if I
> > can get it to work.
> >
> > On Wed, Feb 2, 2022 at 8:48 PM Aaron Ash wrote:
&g
Very cool!
On Fri, Feb 4, 2022 at 3:06 PM Raul Miller wrote:
> On Thu, Feb 3, 2022 at 7:17 PM bill lam wrote:
> > gl2 expect ascii or utf8. Try
> > gltext 8&u: u:9017
> > Or
> > gltext 8&u: 9017
>
> Thanks -- that worked. (And, I've updated the gltext entry in the wiki
> to reflect this issue.)
t;
> On Wed, Feb 2, 2022 at 5:27 PM Stefan Baumann wrote:
> >
> > Ric, You might want to check out DuckDB (https://duckdb.org/), I
> recently
> > used it for reading and writing Parquet files.
> > It's similar to SQLite but intended to be used for analytics.
&
!
On Wed, Feb 2, 2022 at 8:27 PM Stefan Baumann wrote:
> Ric, You might want to check out DuckDB (https://duckdb.org/), I recently
> used it for reading and writing Parquet files.
> It's similar to SQLite but intended to be used for analytics.
> Stefan.
>
> On Wed, Fe
else is interested, we could collaborate at
> least on the design.
>
> Chris
>
> On Mon, Jan 31, 2022 at 10:21 AM Ric Sherlock wrote:
>
> > Yes, I've been thinking that a Dataframes equivalent in J would be
> useful.
> > Most things are already possible with J&#
> otoh, we already have a binding to R where you can deal
> with dataframes easily – do we want to “compete” here, too?
>
> In terms of whether to just adopt/use one of R's/Pandas'/Polars'/Julia's
dataframes rather than reinventing the wheel - I think for me that if it
were possible to use J primit
; >
> > I’ve tried Jd, it’s equivalent to pandas I think (and about as
> performant) though it’s persistent (being a database).
> >
> > q/k is faster, I think because it’s ordered by default - maybe something
> like ordered dataframes could be implemented in J?
The start-up experience is now much more informative & welcoming. Nice!
On my laptop (4 cores) with WSL using the cpu backend to run the matmul
benchmark,
it looks as though the point at which jaf outperforms native J matrix
multiplication is about 150x150
On Mon, Jan 31, 2022 at 7:14 AM Eric Ive
t.
>
> -E
>
> P.S. regarding analysis/optimization: I would love to see it, but for some
> reason everybody is scared of building a compiler because of the parsing
> problem.
>
> On Mon, 31 Jan 2022, Ric Sherlock wrote:
>
> > Yes, I've been thinking
Yes, I've been thinking that a Dataframes equivalent in J would be useful.
Most things are already possible with J's arrays, but conceptually
DataFrames are well understood by many now, and they make it easy to work
with datasets as named fields.
I've spent a reasonable amount of time working with
Hi Pete,
There is a collection of syntax highlighting efforts for various
environments on the J wiki at
https://code.jsoftware.com/wiki/Guides/Syntax_Coloring
Feel free to add yours!
I have also developed a TextMate syntax file for J at:
https://github.com/tikkanz/JSyntax
I haven't looked at yours
Thanks Eric - this looks very promising!
I managed to get it installed & running on WSL although I needed to amend
the instructions on the arrayfire website somewhat so I could write to
/etc/ld.so.conf.d/
Any thoughts on where the switchover point is at which Arrayfire is
compelling relative to J'
Raul,
Not sure if your request was prompted by your thinking that H. was no
longer available in J9, but in case it's useful erf as defined in
stats/distribs/normal works on non integers.
erf 0.5 1 1.5
0.5205 0.842701 0.966105
NB. erf v error function
NB. ref Abramovitz and Stegum 7.1.21 (right)
e
Or using Igor's math/mt addon:
load 'math/mt'
coinsert 'mt'
calcMatrixRank_qrmt=: #@(] -. 0 #~ #)@([: clean tru@}:@geqrf)
calcMatrixRank_qrmt _3 ]\ 1 2 3 5 4 6 9 7 8
3
calcMatrixRank_qrmt _3 ]\ 1 2 3 2 4 6 9 7 8
2
On Sat, Jan 15, 2022 at 3:30 PM Ric Sh
Putting John's suggestion of using LAPACK into practice.
LAPACK is available in the J9.03 Package Manager via the math/lapack2 addon.
Once installed (you also need to follow the simple steps to install the
binary library for your OS)
Then I think the following should calculate the matrix rank using
Not sure this is the preferable way but one solution might be:
load 'math/misc/matfacto'
matrixrank=: #@(] -. 0 #~ #)@(1 {:: lud)
matrixrank _3 ]\ 1 2 3 5 4 6 9 7 8
3
matrixrank _3 ]\ 1 2 3 2 4 6 9 7 8
2
Note that "rank" has lots of alternative meanings in J other than
calculating the
A new version of the stats/base addon has been released.
It includes the following new verbs:
quantiles vquantiles of y at the specified probabilities x
nquantiles v values which partition y into x quantiles
iqr v inter-quartile range (IQR) of y
ntiles v assign values of y to
ship it with J for iOS in its next
> update.
> (And how about an extra line in jqt > Help, which opens a window showing
> the pdf?)
>
> On Mon, 8 Nov 2021 at 23:17, Henry Rich wrote:
>
> > I did the original card, and Ric Sherlock put it into the pretty form it
> >
In case you haven't seen it yet:
https://code.jsoftware.com/wiki/Essays/Sudoku
On Thu, Oct 14, 2021 at 12:12 PM Hauke Rehr wrote:
> After reading what this is about,
> I guess a1, a2 and a3 aren’t atomic
> so maybe you want
> > is&.>/ a1;a2;a3
> instead
>
>
> Am 14.10.21 um 01:00 schrieb Hauke
Some variation on this?
|:(m,:n) {~"1 |: 4$.$. map
aA
aD
bB
bC
On Tue, 21 Sep 2021, 21:37 bill lam, wrote:
> Say I have a boolean matrix
>] map=. 3 4 $ 1 0 0 1 0 1 1 0 0 0 0 0
> 1 0 0 1
> 0 1 1 0
> 0 0 0 0
>
> and 2 vectors of dimension equal to the 2 sides of the matrix
>m=. 'abc
I like the proposed: NB.(
Would it be closed with: )
Apart from more consistent "naming", what are the other benefits of
multiline comments as a feature that currently aren't provided by {{)n or 0
: 0?
Currently I use Note, a variation on 0 : 0 from the stdlib (
https://code.jsoftware.com/wiki/Sta
Cross posting to the beta forum where we should continue the discussion.
I can't reproduce the error shown in J9.03 (linux jconsole) or J9.02
linux/windows jconsole/jqtide
x9=: 1e6 ?@$ 2e9
y9=: 1e5 ?@$ 2e9
f9=: x9&i.;
type 'f9'
++
|verb|
++
JVERSION
Engine: j903/j64avx2/lin
I have made a change to the page noting that the Kahan summation feature
was added in J9.03.
Imre - this thread relates to the current beta version of J. My expectation
is that there will be bugs and that this is our opportunity to help the
team iron them out before release.
If you have come acros
Just to provide some context to Henry's statement that things have changed
a bit since J8.05, below are the timings I get on my phone (Pixel 4a) using
J902.
,.f"0]2^>:i.13
0.024127
1e_5
2e_6
3e_6
3.4e_5
0.000909
0.000425
0.012697
0.020461
0.139175
1.00075
6.6658
56.7179
On Mon,
uation
> the 'NB. The number of points in the last interval is undercounted by
> 1' is good for. I could look it up, but I think comments should focus
> on purpose rather than just mention implementation details. Is this
> something you feel comfortable elaborating on?
>
I've made some changes to stats/base in this Pull request
https://github.com/jsoftware/stats_base/pull/5
Any suggestions/objections?
Changes are basically:
* the current version of histogram is replaced with histogram2 (also
called histogramL)
* histogram1 is added as histogramR
* added Idotr
This link may be of interest.
Can QR Decomposition Be Actually Faster? Schwarz-Rutishauser Algorithm
https://link.medium.com/s1t2vXHAYfb
On Tue, 4 May 2021, 08:48 Hauke Rehr, wrote:
> One might also want to trade Householder for Givens,
> at least in certain circumstances. Would be nice to
> •
Minesweeper appears to be working fine for me in J902 (Windows Qt) and on
Android.
Bill it looks like the dialogs with xywh commands were introduced to
support jnet? However they don't seem to interfere with the Windows Qt
version for me.
On Sat, May 1, 2021 at 1:40 PM Devon McCormick wrote:
>
Hi Emir,
In case you haven't seen them yet I've provided a couple of links to
resources that may be useful. The first is quite a long forum thread that
amongst other things talks about whether trees could/should/will be added
as another datatype to J.
http://www.jsoftware.com/pipermail/programming
limits=: 14 18 249 312 389 392 513 591 634 720
data=: 1e6 ?@$ 1000
50 timespacex ' limits2 # binnedData data'
0.0135251 2.517e7
50 timespacex ' limits2 histogram2 data'
0.00884346 1.67788e7
On Sun, Apr 11, 2021 at 2:21 PM Ric Sherlock wrote:
> Good questi
Good question Brian and interesting discussion.
I agree that the key to the problem is to agree exactly what the desired
behaviour of histogram should be.
Mathematical/statistical convention seems to be that Intervals should be
closed on the left and open on the right. This makes life a bit harder
al code off in those cases. Now I get
>
> 50 timespacex '+/ 8 % tstdata'
> 0.005984 4.19581e6
> 50 timespacex '8 +/@:% tstdata'
> 0.00598417 4.19594e6
>
> But I can offer you one improvement:
>
> 50 timespacex '8. +/@:% tstdata'
Hi Devon,
Given that arc/zip is not available on J9 and arc/ziptrees is dependent on
it, that addon should also be set to not be available on J9.
I'll update that.
Thanks,
On Sat, Mar 13, 2021 at 4:04 PM Devon McCormick wrote:
> Has anyone used the "ziptrees" addon in J? Or the code at
> https
I was initially surprised by the big differences in performance between
different formulations of the sum of the quotients
tstdata=: _2 */\ 1+2*i.100
50 timespacex '+/ 8 % tstdata'
0.00206915 4.19581e6
50 timespacex '8 +/@:% tstdata'
0.0686648 1792
The first is up to 113 times faster (dep
0 0 4 1 2 1 0 # 2 3 5 7 11 13 17 19 23
>
> 5.60258
>
> equal the dyadic
>
>1 1 0 0 4 1 2 1 0 stddev 2 3 5 7 11 13 17 19 23
>
> 5.82237
>
> ?
> Den lørdag den 27. februar 2021 14.12.10 CET skrev Ric Sherlock <
> tikk...@gmail.com>:
>
> Any obj
Any objections to redefining mean, dev, ssdev, var, stddev in the
stats/base add on to calculate the weighted equivalents if invoked
dyadically?
I. E.
wmean=: +/@[ %~ +/@:*
wdev=: ] -"_1 _ wmean
wssdev=: [ +/@:* *:@wdev
wvar=: (#@-.&0 %~ <:@#@-.&0 * +/)@[ %~ wssdev
wstddev=: %:@wvar
mean=: (+/ %
Hi Emir,
Yes _ represents infinity. So in this case x g"1 _ y will pass a row of x
(1) and the whole of y (_) to the verb g until all rows of x have been
processed.
In this case g is actually the verb f"1 1
On Tue, Feb 23, 2021 at 10:07 PM Emir U wrote:
> Thank you for the insights Henry.
>
> I
Hi Harvey,
Sounds like the data given might be quite a simplification from the
reality, but let's start with that for now.
The following will subtract 12 from the boxed row of numbers in the
example. It assumes that the numeric values are numeric and not text.
dat=: '|'&splitstring;._2 -.&' ' nou
Actually 0&". Seems to convert number strings containing commas OK.
0 ". > '123,555';'253,562.26'
123555 253562
On Fri, 19 Feb 2021, 02:27 Ric Sherlock, wrote:
> My initial reaction is that the tables/csv add on should read those OK,
> the issue w
My initial reaction is that the tables/csv add on should read those OK, the
issue will be converting the number strings in the cells to numbers.
If there are no meaningful commas other than the field delimiters, couldn't
you use -.&','each after readcsv to remove them?
Alternatively:
TAB fixdsv
to
> criticism and correction in this and perhaps other forums/fora.
> >
> > Cheers,
> >
> > Mike
> >
> > Sent from my iPad
> >
> >> On 13 Feb 2021, at 23:20, Ric Sherlock wrote:
> >>
> >> Hi Mike,
> >> I've made
Hi Mike,
I've made the suggested change and pushed to GitHub.
Next time the addon is released, the change will be included.
I wonder if it makes sense for suggestions like this to be provided as a
GitHub pull request where possible?
* less chance of miscommunication between report and fix
* easier
I enlarged the plot window, took a screenshot and then measured the
distance between _0.8 to 0.8 on the two axes using an on-screen ruler, the
Y-axis distance is about a centimetre longer than the X-axis distance.
On Wed, Feb 10, 2021 at 1:52 PM bill lam wrote:
> I think it's ok to have differen
Better handling for empty string (also from JforC Programmers) would be:
ifany=: {{ u^:(*@#@]) }}
dedouble=: splitDigraph/&.|. ifany
On Sat, Feb 6, 2021 at 3:45 PM Ric Sherlock wrote:
> Thanks for that reference. It helped me understand what was going on here
> and a good reminder
NB.
> data=:data1;data2;data3;data4;data5
>
> >
>NB. Same solution with α instead of X
>
> >
> +---+------+-+--+
>
> >
> |THEαEQUICKBROWFαFOX|THEαEQUICKBROWFOOX|TαTHEαEQUICKBROWFαFOX|Tα
t;"1]_2 ]\ str
>;dbld,&.>(>=/&>dbld){'';'X'
> AAXAbbCCCXC
>
>
> On Thu, Feb 4, 2021 at 11:56 PM Ric Sherlock wrote:
>
> > Only repeats that occur within a digraph need to be split, so:
> >
> >showDigraphs dedouble &#
'-.~,str,.' ',~(=/"1 dbld){' X' NB. Assuming there will be no
> legitimate spaces
> AXAXAbXbCXCXCXC
>
>
> On Thu, Feb 4, 2021 at 11:46 PM Ric Sherlock wrote:
>
> > Using ideas from the solutions so far, this is the version I currently
>
ata4;data5
1
On Fri, Feb 5, 2021 at 5:32 PM Ben Gorte wrote:
> Ah yes, better!
> Works on the five test cases :-)
>
>
> On Thu, 4 Feb 2021 at 23:13, Ric Sherlock wrote:
>
> > Thanks, yes that works!
> > Here's a slightly simpler take on the same approach:
>
Yes as Hauke has previously identified, we need some more test cases to
fully test whether the spec is correctly implemented or not.
I'm thinking that the example outputs you've shown in your email aren't
correct, but I agree that your approach and Raul's generate different
solutions for that input
min' via Programming:
> > assuming you want all dedoubled on a pass and not just first match,
> >
> >
> >
> > ;@:(_2&(,`([,'X',])@.=/each@<\))^:_ 'THEEQUICKBROWFFOOOX'
> >
> > THEXEQUICKBROWFXFOXOXOX
> >
> >
> > ;@:(_2&(,`
FOOX'
> >
> > s =: 2 : 0
> > a =. 0 -.~ (* i.@#) m=y
> > n a} y
> > )
> >
> > NB. ugly, repetitive junk solution
> > res1 = ('?'s'X') (] (>:@(+ i.@#)@(2 I.@:=]) (([e.~i.@#@]){"0 1'X',.~])
> > #~) (i.@# >:@e.
d be tempted to go with
>
> dedouble=: #!.'X'~ 1 j. #{.}.=}:
>
> But I do not understand why the double O in your second example does
> not get an X inserted. So maybe I am missing something.
>
> I hope this helps,
>
> --
> Raul
>
> On Wed, Feb 3, 2021
I need to separate any digraphs in a string, that consist of 2 letters the
same, by inserting an 'X' between them.
_2 ]\ 'THEEQUICKBROWFFOX'
TH
EE
QU
IC
KB
RO
WF
FO
X
'EE' is a digraph that needs an 'X' inserted. Doing so will result in:
TH
EX
EQ
UI
CK
BR
OW
FF
OX
So now we also need to separ
Hi all,
I've made some changes (not yet released) to the math/misc addon. The
changes are in the linear algebra area and are predominantly to linear.ijs
and matfacto.ijs.
Apart from adding the LU decomposition verb from the wiki, the most
substantive change was to gauss_elimination which should now
Thanks Henry!
On Thu, 21 Jan 2021, 15:47 Henry Rich, wrote:
> The next beta will remove one leading blank line from the display.
>
> Henry Rich
>
> On 1/19/2021 9:22 PM, Ric Sherlock wrote:
> > In a similar vein,
> > The first line of a multi-line definition doesn&
What makes you think that?
As far as I can see it appears to be correctly linked from the website and
I have it installed.
On Thu, 21 Jan 2021, 00:54 Arnab Chakraborty, wrote:
> Aha, nice feature. However, J902 is still not available for Android.
>
> On Wed, 20 Jan 2021, 17:14 Ric
{{ }} digraphs were introduced in j902
https://code.jsoftware.com/wiki/System/ReleaseNotes/J902
See
https://code.jsoftware.com/wiki/Vocabulary/DirectDefinition
On Wed, 20 Jan 2021, 22:32 Arnab Chakraborty, wrote:
> I could not find any doc on {{ and }} as Raul has used. Any pointer?
>
> On Tue,
In a similar vein,
The first line of a multi-line definition doesn't respect indentation, so:
mutate=: {{idxmut=. I. x >: (*/$y) ?@$ 0
(populate idxmut) idxmut"_} y
}}
mutate
4 : 0
idxmut=. I. x >: (*/$y) ?@$ 0
(populate idxmut) idxmut"_} y
)
mutate=: {{ idxmut=. I. x >: (*/$y) ?@$ 0
t; This is close, but not equal to the input.
>
> stringToRational '100.12345' gives:
>
> 2002469r2
>
> This is correct.
>
> My solution parses the digits exactly as if there were no dot and
> divides by 10^(number of digits after point
Hi Justin,
I'm not entirely clear what your desired behaviour/use case is, however if
you add another closing parenthesis then your definition above does not
give a (syntax) error, but doesn't give the number you suggest.
stringToRational =: ((_&".)@(-.&'.') %&:x: 10&^@(<:@# - (i.&'.')))
stringTo
Hi Skip,
Check out the Vocabulary page for {
https://code.jsoftware.com/wiki/Vocabulary/curlylf
On Mon, Dec 21, 2020 at 9:09 AM Skip Cave wrote:
> ]x=.1 3 5;2;3 4
>
> ┌─┬─┬───┐
>
> │1 3 5│2│3 4│
>
> └─┴─┴───┘
>
> {x
>
> ┌─┬─┐
>
> │1 2 3│1 2 4│
>
> ├─┼─┤
>
> │3 2 3│3 2 4│
Yes Harvey, my mistake, thanks to Ric Sherlock then for writing a very
> effective extension.
> For me it trumps Emacs because when you hit Cmd+Return on a line that is
> the start of a definition of a verb it automatically reads until the
> closing ).
>
> My workflow is usually
In case it is of interest to others I thought I'd mention the following
addon that I use to help me move data back and forth from C structs to J.
https://github.com/tikkanz/data_struct
On Tue, Dec 8, 2020 at 10:46 PM emacstheviking wrote:
> Thanks Devon.
> Most helpful. I am a seasoned C/C++ pr
I understand the sentiment, but when it's more concise, faster and leaner,
it is hard to ignore!
On Sat, 14 Nov 2020, 09:37 Henry Rich, wrote:
> /Et tu, R. E.?/
>
> Using $. for this is using a sledgehammer to crack an egg.
>
> Henry Rich
>
> On 11/13/2020 3:00 PM, R.E. Boss wrote:
> > $.$.M
How about
4 $. $. 6=M
1 1
On Sat, 14 Nov 2020, 06:54 Hauke Rehr, wrote:
> plus, Henry’s solution looks more idiomatic (too me, at least)
>
> usually, I try to keep related structures aligned (using grade)
> other than that, I hardly remember any cases when linear indexing
> didn’t do the jo
For the non-noun form of DD, the wiki states
> If the very first character following the leading delimiter is ), the
> first line contains control information and is not part of the entity being
> defined.
>
So apart from the first letter after ), is the rest of the line ignored?
That is essentia
Henry Rich
>
> On 10/30/2020 5:16 PM, Ric Sherlock wrote:
> > I seem to be getting different closing behaviour for noun DDs, depending
> on
> > whether I use JConsole or JQt.
> > JConsole follows the description of noun DD on the wiki page, i.e. "the
> >
I seem to be getting different closing behaviour for noun DDs, depending on
whether I use JConsole or JQt.
JConsole follows the description of noun DD on the wiki page, i.e. "the
trailing delimiter is the two-character sequence }} when found at the
beginning of a line."
JConsole
===
'prefix' ,
Hi Bob,
Just worked my way through the playlist. Fantastic!
From my point of view it was a great balance of maths, computing and
problem solving. You also managed to slide a heap of J primitives and
features into the Labs without losing the focus on the problem.
I thought the animations were very c
Also if you multiply by x to get
2 + 4.9x = 0
You can solve using p.
p. 2 4.9
┌───┬─┐
│4.9│_0.408163│
└───┴─┘
On Sun, 25 Oct 2020, 09:47 Martin Kreuzer, wrote:
> N is at most times sensitive to its start value ...
> it does work in this case (but as you stated, it will no
Hi Devon,
A quick search on the wiki brings up this page. Does that help?
https://code.jsoftware.com/wiki/Guides/Startup
On Tue, 29 Sep 2020, 08:12 Devon McCormick, wrote:
> I now have J running under both Windows 10 and Ubuntu Linux under WSL. I
> would like to ensure that I run the same conf
Would probably have been clearer to say "specifying an unboxed table as a
list of selectors is supported"
On Fri, Aug 7, 2020 at 4:59 PM Ric Sherlock wrote:
> Very nice bob!
>
> Just to add that as of J9, specifying an unboxed table as a selector is
> supported so:
>
Very nice bob!
Just to add that as of J9, specifying an unboxed table as a selector is
supported so:
rep (1 0 2 ,: 0 2 1)} t
┌──┬──┬──┬──┐
│0 │1 │2 │3 │
├──┼──┼──┼──┤
│4 │5 │6 │7 │
├──┼──┼──┼──┤
│8 │a │10│11│
└──┴──┴──┴──┘
┌──┬──┬──┬──┐
│12│13│a │15│
├──┼──┼──┼──┤
│16│17│18│19│
├──
Skip, that seems like a very old version of the stats/base addon?
According to GitHub the sampledesign script was renamed to combinatorial
back in 2008.
perm is currently available in ~addons/stats/base/combinatorial.ijs
(stats/base/combinatorial)
On Tue, May 26, 2020 at 8:45 AM Skip Cave wrote:
The current parsers in tables/dsv deal with the worst case scenario (e.g.
type is mixed within and between columns, fields can contain field and/or
record delimiters). The more you can assume that these edge cases are not
present, the more you can reduce memory usage. If for example you know that
I've discovered an issue with the 'stats/distribs' addon that pops up in
J901, but didn't before (e.g. J807).
To reproduce:
load 'stats/distribs'
coinsert 'pdistribs'
qnorm01 0.95
Segmentation fault (core dumped)
However the following works (for a while):
load 'stats/distribs'
co
I agree that the behaviour of the two should match, but am not sure what
the desired definition should be. The Nuvoc page for the assert. keyword
says that the entire list must be 1s, which at one level makes sense to me,
however the test for if. is that the 1st item of the array is nonzero and
the
The best source of info on special code or Combinations that I know of is
here:
https://code.jsoftware.com/wiki/Vocabulary/SpecialCombinations
On Sun, Dec 29, 2019 at 1:59 AM Raul Miller wrote:
> On Sat, Dec 28, 2019 at 7:38 AM Arnab Chakraborty
> wrote:
> >Thanks for the code. But I did n
Very nice Michal!! Very useful reference for building GUIs with J.
On Sat, Dec 28, 2019 at 1:03 PM Michal Wallace
wrote:
> Okay, so still jumping around all over the screen due to editing out all
> the ums and errs, but... This one should hopefully be a lot easier to read,
> and I tried youtube'
You could also use
argminall=: 4 $. $.@(= <./@,)
However because neither take advantage of the special code (i. <. /), they
don't have the same performance.
On Fri, 27 Dec 2019, 14:42 Jimmy Gauvin, wrote:
> Adding to Henry's idiom :
>
>argminall =: $ #: I.@(= <./)@,
>argminall 3 3$5
>
As far as I can see, the latest j901 apk is beta L.
On Wed, 18 Dec 2019, 21:25 ethiejiesa via Programming, <
programm...@jsoftware.com> wrote:
> Oh wow. Just stumbled across this myself.
> FWIW, doing the dumb thing by copying the url and changing 807 to 901 does
> work.
>
> Arnab Chakraborty w
Thanks Henry - sounds great.
On Wed, Dec 18, 2019 at 7:22 AM Henry Rich wrote:
> No, no... don't try to reimplement i. . That's a lifetime of work. Or
> more.
>
> I will return the limit on the size of an array back to what it was,
> 2^48. That will be enough for all of us!
>
> The flaw in my
1!:1 <'mybigfile.csv'
returns a limit error on J901 but completes successfully on j64_807.
On Tue, Dec 17, 2019 at 9:56 PM bill lam wrote:
> does 1!:1 work?
>
> On Tue, Dec 17, 2019, 1:09 PM Ric Sherlock wrote:
>
> > I have run into a difference between J
I have run into a difference between J901 and J807 that I hadn't come
across before when dealing with large (~7GB) files.
In both versions I can see the file
fexist 'mybigfile.csv'
1
fsize 'mybigfile.csv'
7516003225
I can also read the beginning the file in both versions
$freads 'mybigfi
Haven't got time to look at your code in detail, but stabbing blindly in
the dark - have you tried double quoting your URL?
See the following StackOverflow question and answer:
https://stackoverflow.com/questions/55753504/reading-csv-file-from-a-a-secured-link-with-j
On Mon, Nov 25, 2019 at 3:36 P
Here's one option...
]m=: 5 6 >:@:?@$ 6
2 3 6 3 6 2
6 1 3 3 6 4
2 1 5 2 4 6
1 2 4 6 3 1
4 1 6 6 4 6
oc=: <:@([: #/.~ ,)"1
(>:i.6) oc m
0 2 2 0 0 2
1 0 2 1 0 2
1 2 0 1 1 1
2 1 1 1 0 1
1 0 0 2 0 3
On Mon, 4 Nov 2019, 20:07 Skip Cave, wrote:
> NB. Generate multiple sets of 6 random inte
>
>
> (;@:(<@(<\))~ >:@i.@#) 'abcdefg'
>
> engages the special code for ;@:(<@f)) which avoids boxing overhead and
> speeds up ; . All the parentheses are necessary for the fast form to be
> recognized.
>
> Henry Rich
>
> On 10/24/2019 10:49 PM, Ri
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