you could probably distinguish between the
> different cases but the key is to get input as character.
>
> On Fri, Sep 15, 2023 at 3:43 PM Elijah Stone wrote:
>
>> No. No more than you can distinguish 2+2 from 2 + 2.
>>
>> On Sat, 16 Sep 2023, Piet de Jong wrote:
>>
008 and 8.
>
> On Sat, 16 Sep 2023, Piet de Jong wrote:
>
>> I meant a general verb u such that
>> 011 -:&u 11
>> 008 -:&u 8
>> etc are all false.
>>
>>> On 16 Sep 2023, at 04:50, Elijah Stone wrote:
>>> u=: 1 -: 3!:0
>>
144
> t=. '/boolean/literal/integer/floating/complex/boxed/extended/rational'
> t=. t,'/sparse boolean/sparse literal/sparse integer/sparse floating'
> t=. t,'/sparse complex/sparse boxed/symbol/unicode/unicode4'
> (n i. 3!:0 y) pick <;._1 t
> )
>
>
I meant a general verb u such that
011 -:&u 11
008 -:&u 8
etc are all false.
> On 16 Sep 2023, at 04:50, Elijah Stone wrote:
>
> u=: 1 -: 3!:0
--
For information about J forums see http://www.jsoftware.com/forums.htm
Would like a verb u such that (u 1) does not match (u 01)
Without resorting to character input.
--
For information about J forums see http://www.jsoftware.com/forums.htm
3 2 4 5
>> 4 2 3 5
>> 5 2 3 4
>>
>> Another possibility is to rotate the axes,
>>
>> slicer=. (|. i.@:#@:$@:]) |: ]
>>
>> (0 1 2 3) ($ o slicer"0 _) Y
>> 2 3 4 5
>> 3 4 5 2
>> 4 5 2 3
>> 5 2 3 4
>>
>>
you are looking for is a transpose.
>
> Maybe
>
> ~.@(, i.@#) |: ]
>
> Untested.
>
> Henry Rich
>
> On Wed, Sep 6, 2023, 6:10 PM Piet de Jong wrote:
>
>> Here is my “wish"
>>
>> A dyadic (tacit) verb such that x v y gives all the slices
25
> 2 (1 slice) n
> 2
> 5
> 8
>
> 11
> 14
> 17
>
> 20
> 23
> 26
> 0 (0 slice) n
> 0
> 1
> 2
>
> 3
> 4
> 5
>
> 6
> 7
> 8
>
>
> 9
> 10
> 11
>
> 12
> 13
> 14
>
> 15
> 16
> 17
>
Here is my “wish"
A dyadic (tacit) verb such that x v y gives all the slices of y along dimension
x, where x is integer. That is to say
i{ x v y
is slice i of the array y along dimension x.
Thanks for all your help!
> On 7 Sep 2023, at 08:04, 'robert therriault' via Programming
> wrote:
I’m looking for a verb that does the relevant slicing.
Hopefully the verb can be used to slice on any dimension.
> On 7 Sep 2023, at 07:26, Brian Schott wrote:
>
> Does this help?
>
> ,./0 1 {"1 m
> 0 2
> 1 3
>
>
> --
> (B=) <-my sig
> Brian Schott
> --
Apologies if this is an ignorant question. (Always learning)
I want to take “slices” of a multidimensional array.
For simplicity suppose the array is 2 dimensional
(This is not my actual situation but illustrates my difficulties)
m=. i.2 2
The two horizontal slices are 0{m and 1{m or more simp
Ok thanks. I didn’t want to “reinvent the wheel."
> On 20 Aug 2023, at 07:54, Henry Rich wrote:
>
> I don't know. The last I used it was years ago. I had to make new wrappers
> sometimes; it was straightforward.
>
> Henry Rich
>
> On 8/19/2023 5:35 PM
19/2023 4:03 PM, Piet de Jong wrote:
>> I’ve just updated to J9.4 and Lapack2.
>>
>> The verb do_dgeev from math/lapack2 appears to work fine for real matrices.
>>
>> However it gives a “domain error" when applied to a complex matrices.
>
I’ve just updated to J9.4 and Lapack2.
The verb do_dgeev from math/lapack2 appears to work fine for real matrices.
However it gives a “domain error" when applied to a complex matrices.
Is this how it should be? Or I am missing something?
---
> See https://en.wikipedia.org/wiki/Equation_solving for some of the issues.
>
> If f can be expressed as a polynomial, you might want to consider
> using https://www.jsoftware.com/help/dictionary/dpdot.htm
>
> Thanks,
>
> --
> Raul
>
> On Wed, Nov 4, 2020 at 7:27 P
Still trying to learn/improve my J after 25 years.
Here is the issue. I’m probably having a pipe dream.
Suppose you have an implicit function f(x,y)=0 which is relatively “clean” (ie
simple to specify)
Is there a “clean/efficient” way in J to solve for y given x or vice versa.
I know I can
convoluted but illustrates how I don’t (yet?) find your way of thinking as
“natural."
> 5, 6, 7. It's a Wiki. If you think the documentation could be improved, go
> ahead and improve it.
Not familiar with how I can edit the documentation and would not be comfortable
doing witho
I've been experimenting with the new fold conjunction F:. . I think it's a
very useful addition to J and thank all those who have made this possible.
Nevertheless I have some comments/reactions.These are made in a
constructive spirit. Perhaps these comments just display my own ignor
┬─┬─┬─┬─┐
│1│=│0│+│1│
└─┴─┴─┴─┴─┘
┌─┬─┬─┬─┬─┐
│3│=│1│+│2│
└─┴─┴─┴─┴─┘
┌─┬─┬─┬─┬─┐
│6│=│3│+│3│
└─┴─┴─┴─┴─┘
1 3 6
Both give the same result.
> On 3 Jul 2020, at 11:47 am, Xiao-Yong Jin wrote:
>
>
>> On Jul 2, 2020, at 3:18 PM, Piet de Jong wrote:
>>
>> My issue is not with x and y
ained, but not stridently enough to convince us to
> change it. Dissenters could get in the habit of writing (v~), perhaps.
>
> Henry Rich
>
> On 7/2/2020 3:22 AM, Piet de Jong wrote:
>> Thanks. Didn’t realise the significance of the change. Have now got it to
>> work.
&g
xpecting the old interpretation. NuVoc is for 9.02 (it has a note to
> that effect IIRC).
>
> Henry Rich
>
> On 7/1/2020 7:29 PM, Piet de Jong wrote:
>> Started looking at fold — seems a very useful new verb.
>> However couldn’t get it to work
>>
>> Engine
Started looking at fold — seems a very useful new verb.
However couldn’t get it to work
Engine: j901/j64avx2/darwin
Release-e: commercial/2020-01-29T12:41:32
Library: 9.01.21
Qt IDE: 1.8.6/5.12.7(5.12.7)
Platform: Darwin 64
Installer: J901 install
InstallPath: /applications/j901
Here is the wha
Am having a mental block about this problem so will appreciate any help. The
following is a simplified version of the problem. Apologies if this is a
stupid question.
Take the verb ^. which has both a monad and dyad definition: log_e(y) for monad
and log_x(y) for dyad
Now suppose I want th
I know this is a very, very minor point.
But it was one my (very many) roadblocks in learning of J.
It seems more natural to say (u@v y) is "u of v of y” rather than 'u atop v
of y.”
Why not rename @ as “of”?
--
For inf
>
> R.E. Boss
>
>
>> -----Oorspronkelijk bericht-
>> Van: Programming
>> Namens Piet de Jong
>> Verzonden: vrijdag 3 mei 2019 11:20
>> Aan: Programming forum
>> Onderwerp: Re: [Jprogramming] Applying different verbs to different items.
>
s why perhaps I thought
it could be an adverb or conjunction: a counterpart to “evoke” ~.
> On 3 May 2019, at 10:09 pm, Henry Rich wrote:
>
> Impossible - v never sees y, only its value.
>
> Henry Rich
>
> On 5/3/2019 6:58 AM, Piet de Jong wrote:
>> If m is the name (
y, check ": .
> Otherwise if you want something like this
>
> var=: i.3
> 'var' -: v var
> 1
>
> then I doubt that such a v exists.
>
> Cheers,
> Louis
>
>> On 3 May 2019, at 12:58, Piet de Jong wrote:
>>
>> If m is the name (ie
If m is the name (ie string) of a variable then ‘m'~ is the value of the
variable.
Is there an “inverse" to this?
That is I want a verb v (or adverb or conjunction) so that if y is a variable
then
v y
is the name (ie string) of the variable.
r dyadic verb use in the
> gerund.
>
> c2=: respectively ]
>
> g c2 3 1 0 3
>
> 9 0.5 1 9
>
> g c2 i. 3 4
>
> 0 1 4 9
>
> 2 2.5 3 3.5
>
> 2980.96 8103.08 22026.5 59874.1
>
>
>
>
> On Fri, May 3, 2019 at 8:16 PM Piet de Jong w
Following all the suggestions, the following seems to get close
g=. *: ` -: `^
c=. /.~
g c i.3 4
0 2 4 6
2 2.5 3 3.5
16 18 20 22
$ g c i.3 4
3 1 4
The only annoying thing are the final dimensions, fixed up with ,”2
> On 3 May 2019, at 5:04 pm, Piet de Jong wrote:
>
> c=
c=:((128!:2)&.><)”0
seems to work great. Will have to work out exactly why it works — don’t
understand the why the rank 0 boxing makes things happen the right way.
> On 3 May 2019, at 2:32 pm, Gilles Kirouac wrote:
>
> or (not as simple)
>
> c=: (128!:2)&.><
>
> g c"0 y
>
> ┌─┬───┬─┐
>
; 0 1 4 9 16
>2.5 33.5 4 4.5
> 22026.5 59874.1 162755 442413 1.2026e6
>
> The transpose works in this case because the 3 gerunds are applied to each
> transposed row and then Under (&.) undoes the transpose to provide the
>
Thanks! But it doesn’t appear to generalise to applying successive verbs in
the gerund to successive >>items<< in y.
(I checked the dictionary re /. and it talks of “collections” of y. Not sure
what that means)
For example if y is i.3 5 then I’d like the first verb in the gerund to apply
I’m using Rserve — it works well (many thanks for making this possible -
extremely useful)
However the dyadic form of Rget does not seem to work (monadic works ok)
The problem seems to be that Rget uses “rgetmap_rbase_” and this is not found
NB. sample session — have opened Rserve on the R sid
r a list of jqt shortcuts, which I'm sure is
> there somewhere :-/
>
> Tobia
>
> On Sun, Jan 25, 2015 at 11:26 PM, Joe Bogner wrote:
>
>> Try Ctrl+D or Ctrl+Shift+Up
>> On Jan 25, 2015 5:23 PM, "Piet de Jong" wrote:
>>
>>> I very much
I very much agree with this.
The J way of doing this is unintuitive and (according to me) the most
irritable cosmetic aspect in J.
If you space up, edit, and enter, then the displayed “history” is not an
accurate.
To maintain an accurate history one must space up, enter, edit, enter. This
is
Perhaps one of the issues is the cumbersome input/output of
“real world” data.
Input/output of data organised in say a spreadsheet is one of the
first things a serious user would like to achieve so that he/she can
get on with manipulations.
I know this is possible with tara etc and much apprecia
> ensuring that Edit is open before you use File>Recent...
>
> Best,
> Marc
>
> On Wed, Oct 29, 2014 at 11:23 AM, Piet de Jong wrote:
>> I had it before Yosemite (I think)
>> Where can I find the patch referred to?
>>
>>> On 29 Oct 2014, at 9:52 pm
/jwiki/Guides/Compiling%20Jqt>.
>
> Alternatively, you can work around this issue in your current build by
> ensuring that Edit is open before you use File>Recent...
>
> Best,
> Marc
>
> On Wed, Oct 29, 2014 at 11:23 AM, Piet de Jong wrote:
>> I had it before Yosemite (I think)
I had it before Yosemite (I think)
Where can I find the patch referred to?
> On 29 Oct 2014, at 9:52 pm, bill lam wrote:
>
> thanks. IIRC there was already a patch to fix menu issue on Mac.
>
> Is your problem specific to yosemite?
> On Oct 29, 2014 6:48 PM, "Piet de J
ote:
>
> did you test with jqt 1.2.4? What is your JVERSION?
> On Oct 29, 2014 6:37 PM, "Piet de Jong" wrote:
>
>> When I open J803qt on my Mac the following Menu items display across the
>> top menu bar of the execution window:
>>
>> jqt File Edit View
When I open J803qt on my Mac the following Menu items display across the top
menu bar of the execution window:
jqt File Edit View Run Tools Project Help
After pulling in a file using File>>Recent … the Help menu disappears from the
top menu bar
Can this be correct?
(I need “Help"
lowing in lapack.ijs found in the addon (notice the space at the end).
>
> dll=:
> '/System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/vecLib
> '
>
>
>> On Tue, Oct 28, 2014 at 12:01 AM, Piet de Jong wrote:
set dll=: ... to this file instead?
>
>
> On Sun, Oct 26, 2014 at 7:12 PM, Piet de Jong wrote:
>> Thanks for the message and help.
>>
>> I browsed around and found
>>
>> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/V
e instead?
>
>
> On Sun, Oct 26, 2014 at 7:12 PM, Piet de Jong <mailto:pietd...@gmail.com>> wrote:
>> Thanks for the message and help.
>>
>> I browsed around and found
>>
>> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecL
With the suggested replacement still get the same error:
── (6 of 22) LAPACK (ctd) ───
)
m=: ?4 4$100
geev_jlapack_ m NB. compute eigenvalues and eigenvectors
|domain error: cd
| r=.x cd LASTIN=:y
> On 27 Oct 2014, at 5:33 pm, bill lam wrote:
>
> /System/Library/
cder''
1 0
> On 27 Oct 2014, at 1:26 pm, bill lam wrote:
>
> cder is a verb, to execute you need ot type
>
> cder''
>
> Пн, 27 окт 2014, Piet de Jong написал(а):
>> ── (6 of 22) LAPACK (ctd) ───
>
── (6 of 22) LAPACK (ctd) ───
)
m=: ?4 4$100
geev_jlapack_ m NB. compute eigenvalues and eigenvectors
|domain error: cd
| r=.x cd LASTIN=:y
cder
15!:10
LASTIN_jlapack_
┌─┬─┬─┬──┬─┬───┬───┬───
and cd is the external caller
> On 27 Oct 2014, at 11:26 am, bill lam wrote:
>
> what were the error messages reported? What was the reason for failure
> from cder'' ?
> On Oct 26, 2014 7:13 PM, "Piet de Jong" <mailto:pietd...@gmail.com>> wrot
locate the library and amend the " dll=: ... " line in lapack.ijs .
> On Oct 25, 2014 9:42 PM, "Piet de Jong" wrote:
>
>> So how is the shared dll library installed?
>>
>> Help is much appreciated.
>>
>>
>>> On 25 Oct 201
s not install any binary lapack lib to
> Mac. I suspect if it failed in j80x it will also fail in older
> versions of J.
>
> Сб, 25 окт 2014, Piet de Jong написал(а):
>> I did clean installs of 801 802 and 803 qt for Mac.
>>
>> Also installed the Lapack.
>>
&g
I did clean installs of 801 802 and 803 qt for Mac.
Also installed the Lapack.
All fail to run the Lapack Studio>Lab>Lapack at step 6 where
it attempts to compute eigenvalues/eigenvectors.
It objects to the "cd" command.
Any help gratefully received.
-
> 0
>
> (And there's a delay between the two lines.)
>
> If you do not get similar behavior, I imagine that that indicates some
> problem with your system.
>
> Thanks,
>
> --
> Raul
>
> On Sat, Apr 19, 2014 at 8:18 PM, Piet de Jong wrote:
> > 2!
/library/Rserve/libs/i386/Rserve-bin.so
> --no-save'
>
> Thanks,
>
> --
> Raul
>
>
> On Sat, Apr 19, 2014 at 7:46 PM, Piet de Jong wrote:
> > But isn't pid defined in my first statement? ie.
> >
> > pid=.{. 2!:2 '/Library/
> >
On Sat, Apr 19, 2014 at 7:31 PM, Piet de Jong
> wrote:
> > I call R from J and use the following setup to initiate the R interface
> >
> > load 'stats/r/rserve'
> >
> > pid=.{. 2!:2 '/Library/Frameworks/R.framework/Resources/bin/R
> >
> CMD
I call R from J and use the following setup to initiate the R interface
load 'stats/r/rserve'
pid=.{. 2!:2 '/Library/Frameworks/R.framework/Resources/bin/R
CMD/Library/Frameworks/R.framework/Versions/2.12/Resources/library/Rserve/libs/i386/Rserve-bin.so
--no-save'
Everything works fine.
Ho
Ok get it.
Thanks!
On Mon, Nov 25, 2013 at 9:40 AM, Eric Iverson wrote:
> Welcome is where plots etc show. Close it with touch of button with the
> dot. Read the help. Enjoy.
> On Sunday, November 24, 2013, Piet de Jong wrote:
>
> > Very impressed with this development.
>
Very impressed with this development.
Finally J on a handheld device -- after years of absence (I learned J on an
HP200LX - it was very useful to have it in my pocket instantly accessible)
One annoyance. Why the huge amount of space given to "Welcome to J
etc"
which occupies valuable real
ated in j8 jqt.
> In additon, new clipcopyx and clippastex commands have been
> added which can handle image file. Please see jqt wd reference in
> jwiki.
>
> Пн, 18 ноя 2013, Piet de Jong писал(а):
> > I use it
lease see jqt wd reference in
> jwiki.
>
> Пн, 18 ноя 2013, Piet de Jong писал(а):
> > I use it for copy/paste data from Excel.
> > Works great in J7
> > --
> > For information about J foru
ntire array which
>> resulted from the verb on the right, regardless of the rank of the
>> verb on the right. In other words, it is equivalent to (+/ % #) &.
>> (*:"_) In other words: square the numbers, add them up, divide by
>> their sum, then do the inverse of squa
I use it to copy/paste data from Excel etc files.
Works great in J7
--
For information about J forums see http://www.jsoftware.com/forums.htm
I use it for copy/paste data from Excel.
Works great in J7
--
For information about J forums see http://www.jsoftware.com/forums.htm
; output?
>
> Вт, 05 ноя 2013, Piet de Jong писал(а):
> > I must be doing something wrong.
> >
> > On my Mac Air I get funny little arrows rather than λ.
> > This happens with u: or typing the character in directly into the J verb
> > Any suggestions?
> &g
haracters on plots
> > >From: Christoph von Basum
> > >Date: Mon, 4 Nov 2013 14:40:36 +0100
> > > To: Programming forum
> > >
> > > pd 'ycaption ',":u:955 923
> > >
> > > 955 is small, 923 capital lambda.
>
Is there a way to label axes with "Greek" (or non ascii) characters ?
pd 'ycaption lambda'NB. an example
I want "lambda" to be an actual Greek lambda. How to achieve this?
--
For information about J forums see http://ww
> If someone is interested in making this available then the following C
> port of the original Fortran code looks promising and should be easier
> to hook up to J.
>
> http://www.chokkan.org/software/liblbfgs/
>
>
> On Sat, Sep 8, 2012 at 8:44 PM, Piet de Jong wrote:
>
PM, "Piet de Jong" wrote:
>>
>> Thanks for all the help. This has got me going just fine (at least for
> now)
> Good to hear.
>
>> lgbfgs used to work find for me under J6. So I miss it under J7.
>> Advantage was that it had derivatives and
n: 100
>>> Best Value: 0.
>>> Best Var set:
>>> 0.0000 0.0000
>>> ++---+
>>> |1.06998e_15 _3.06813e_15|1.05583e_29|2020|
>>> || ||
>>> ...
>>>
>&
I 'm trying to use the "deoptim" math addon package.
However can't figure it out.Tried the following trite example to
understand how things work.
NB. Minimize the sum of squares within the range _3 to 3
require 'math/deoptim'
ssq=:+/@*:
deoptim 'ssq';_3 3
This fails for a
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