Note that you can manipulate this.
Include stderr in returned result:
hostcmd_j_ 'example 2>&1'
or
hostcmd_j_ 'exec 2>&1; example'
return only stderr and echo stdout in jconsole:
hostcmd_j_ 'exec 3>&1; exec 1>&2; exec 2>&3; example'
Thanks,
--
Raul
On Mon, Nov 27, 2017 at 9:58 PM, b
Oh, I might be wrong, stderr (not stdout) is echoed in jconsole.
On Sun, Nov 26, 2017 at 4:45 PM, bill lam wrote:
> When using jqt, there is no standard screen output on J session term. But
> should be there if running under jconsole.
>
>
> On Nov 26, 2017 4:06 AM, "J. Patrick Harrington" wrote:
I think if you modify the code from
2!:0 'cmd output'
to one that just read result using J
output fwrite~ 2!:0 'cmd ... wrote:
> Many thanks. The expression
> hostcmd_j_ =: [: 2!:0 '(' , ,&' || true)' solves the problem I had with
> just 2!:0. But is there an explination
> why an exprssi
Second that! A lot of really good work that shows a real payback. I'm
encouraged to revisit my own stuff to make it fit new paradigms better.
The under the covers stuff, like memory management, caused a 2x performance
improvement in the benchmark I've used in APL then J for 50 years. That's a
g
Well then, nice work as a 'slinger' of code. The JE improvements were
substantial and appreciated (as was the rest of the update).
Cheers, bob
> On Nov 27, 2017, at 4:14 PM, Henry Rich wrote:
>
> Thanks, but I'm certainly not the leader - I just sling code for the JE.
> There's a lot more t
Thanks, but I'm certainly not the leader - I just sling code for the
JE. There's a lot more to the system than that.
Henry Rich
On 11/27/2017 6:24 PM, robert therriault wrote:
Henry,
You (and the rest of the team, because there is always a team when there is a
leader) did a great job on tha
> On Nov 27, 2017, at 2:19 PM, Andrew Dabrowski wrote:
>
> Perhaps, but rank seems to be one aspect of J that other languages have
> avoided.
The word “avoided” suggests the decision was conscious.
> APL/J have been very influential, rank may have been a dead end.
Disagree with both. :) By t
Henry,
You (and the rest of the team, because there is always a team when there is a
leader) did a great job on that update!
For more of the improvements with J8.06 see:
http://code.jsoftware.com/wiki/System/ReleaseNotes/J806
Cheers, bob
> On Nov 27, 2017, at 2:43 PM, Henry Rich wrote:
>
>
Mathematica also has a way of specifying at what level a function
should be applied, but specification is relative to the top of the
array rather than the bottom, and that seems to work better.
Rank can be negative.
Henry Rich
---
This email has been checked for viruses by AVG.
http://www.a
Starting in 8.06 all you need is ?@6 .
Henry Rich
On 11/27/2017 4:46 PM, Raul Miller wrote:
It's different, though - the explicit is not a part of the result:
? bind 6
?@(6"_)
But bind has been around for as long as I can remember.
Also, it's mentioned here: http://www.jsoftware.com/help
It's different, though - the explicit is not a part of the result:
? bind 6
?@(6"_)
But bind has been around for as long as I can remember.
Also, it's mentioned here: http://www.jsoftware.com/help/user/lib_stdlib.htm
(The wayback machine says that that particular page has been around
only si
I was reading Stokes' Learning J, but bind is not in the index. Was it a
recent addition to J?
Incidentally,
bind =: 2 : x@(y"_),
so that solution is just a variant of mine. Someone else seems to have
perceived the same lack that I did.
On 11/27/2017 01:54 PM, Raul Miller wrote:
I think
On 11/27/2017 01:00 PM, Daniel Lyons wrote:
I’m sure after we master J, having to program without rank is going to make all
other programming languages seem like much bigger kludges.
Perhaps, but rank seems to be one aspect of J that other languages have
avoided. APL/J have been very influenti
That would require a buffering mechanism, which the file system
already provides.
Thanks,
--
Raul
On Mon, Nov 27, 2017 at 3:29 PM, Xiao-Yong Jin wrote:
> Looks like you ought to call popen for collecting outputs.
>
>> On Nov 26, 2017, at 11:51 PM, bill lam wrote:
>>
>> In j805 2!:0 always fa
Oh, oops.
I think you are right. Sorry about that, I'm really getting careless...
Let's go with the process specified by Erling Hellenäs:
require'stats'
perm=: A.~ i.@!@#
sper=: ,/@:(perm"1)@comb
Thanks,
--
Raul
On Mon, Nov 27, 2017 at 3:47 PM, Andrew Dabrowski wrote:
> This is the correct
This is the correct solution to a different problem. Isn't k sper n
supposed to return lists without repetitions?
On 11/27/2017 11:36 AM, Raul Miller wrote:
http://code.jsoftware.com/wiki/Essays/Odometer
sper=: ] #.^:_1 i.@^~
Thanks,
--
> On Nov 27, 2017, at 1:43 PM, Don Guinn wrote:
>
> So it's not a nilladic function in the sense it requires an argument list
> that's empty.
Standard ML, OCaml and F# also have the limitation that you can’t really have a
niladic function, so they instead have this special value called “unit”
So it's not a nilladic function in the sense it requires an argument list
that's empty. I thought that you wanted a nilladic function that had only a
name.
On Nov 27, 2017 1:12 PM, "Daniel Lyons" wrote:
> >
> > On Nov 27, 2017, at 1:02 PM, Erling Hellenäs
> wrote:
> >
> > Hi all !
> >
> > In F#
Looks like you ought to call popen for collecting outputs.
> On Nov 26, 2017, at 11:51 PM, bill lam wrote:
>
> In j805 2!:0 always failed for this both on linux and mac, On j806,
> change had been made on the linux branch but not on mac. The code
> starts from line 42 of
> the file xh.c
> https:
>
> On Nov 27, 2017, at 1:02 PM, Erling Hellenäs wrote:
>
> Hi all !
>
> In F# there is a unit type, corresponding to void in many other languages. To
> execute a function without arguments you have to give it a unit argument.
> Execute the function f:
> f ()
> A function could also return uni
Hi all !
In F# there is a unit type, corresponding to void in many other
languages. To execute a function without arguments you have to give it a
unit argument.
Execute the function f:
f ()
A function could also return unit:
Here is a function with a unit argument returning unit:
let f () =
When will NuVoc be updates?
On Mon, Nov 27, 2017 at 8:35 AM, Eric Iverson
wrote:
> A Jd update available. Main additions are upsert (new data inserted or
> updated to table as appropriate based on key) and support of keys in delete
> and update.
>
> See release notes at:
> http://code.jsoftware.
Yes, I think this is the shape tail alignment:
alignr=: 1 : 'u&.|: '
(i.2 3) +alignr 10 20 30
10 21 32
13 24 35
/Erling
On 2017-11-27 10:55, Marshall Lochbaum wrote:
There is a way: you transpose the argument array, apply the desired
operation, then possibly transpose the result (as Bri
Sure, similarly
(i.2 3)+" 10 20 30
|syntax error
| (i.2 3)+"10 20 30
Do you see why that's an error?
Thanks,
--
Raul
On Mon, Nov 27, 2017 at 12:54 PM, Erling Hellenäs
wrote:
>align=:2 :0 NB. like x u"n y but coercing cell shapes
> :
>x u/@,:"n y
> )
>(i.2 5) + align 1
I think I'd work through the books and the labs to find out more about
provided functions that are not yet detailed in the wiki. (The wiki is
an ongoing project.)
http://code.jsoftware.com/wiki/Books/Beginners
http://code.jsoftware.com/wiki/Books
http://www.jsoftware.com/help/dictionary/vocabul.ht
The event handlers for buttons and other things in a form are explicit. As
are interval timer event handlers. Look at the source for Help/QT
Demos/Form Styles. Notice all the handlers for events at the bottom are
explicit definitions. Almost every form has a handler to close the form.
Form Styles h
A niladic function would make hook/fork impossible, right? If I can say
randlist
and have it execute the verb randlist to produce a noun, it follows that
rand =: +: randlist
would also execute the two verbs to produce a noun. (f g) and (f g h)
would cease to be hook/fork and would just exec
The reason J has no nullary (niladic, in APL terminology) functions is
that the syntax doesn't support it very well. How do you know when to
evaluate a niladic function? If f is a regular (monadic or dyadic,
depending on context) functions and nil is niladic, is (f@:nil) the same
as ([: f nil)?
Ul
> On Nov 27, 2017, at 11:07 AM, Don Guinn wrote:
>
> The wd callbacks are all explicit.
Can you elaborate on this? I’m not sure what you mean.
--
Daniel Lyons
--
For information about J forums see http://www.jsoftware.co
Nothing wrong with using explicit definitions to force reevaluation on each
call. The wd callbacks are all explicit.
On Nov 27, 2017 11:00 AM, "Daniel Lyons" wrote:
>
> > On Nov 27, 2017, at 10:50 AM, Andrew Dabrowski
> wrote:
> >
> > I didn't say it was a big problem, it's just a slight proble
> On Nov 27, 2017, at 10:50 AM, Andrew Dabrowski wrote:
>
> I didn't say it was a big problem, it's just a slight problem but one that
> came up when I was trying to do something very simple. That's what worries
> me: I can't write even simple programs without using what seem like kludges
> a
align=:2 :0 NB. like x u"n y but coercing cell shapes
:
x u/@,:"n y
)
(i.2 5) + align 1 i.2 3
0 2 4 3 4
8 10 12 8 9
(i. 2 3)+align 10 20 30
|syntax error
| (i.2 3)+align 10 20 30
/Erling
On 2017-11-27 10:51, Raul Miller wrote:
(i.2 5) + align 1 i.2 3
---
Yes, J has a the function "prompt" that when called with the same
argument can return different values. So J is not a pure functional
programming language like Haskell. That's why I thought it might allow
nullary functions.
I didn't say it was a big problem, it's just a slight problem but on
I used
randel =: (? @: #) { ]
Your definition
rand =: randel bind l
does indeed work. I didn't know there was another bind op besides &,
which I now note is actually "bond".
How can I learn more about functions like bind that aren't on NuVoc?
On 11/27/2017 12:09 PM, Raul Miller wrote:
I
> On Nov 27, 2017, at 10:03 AM, Andrew Dabrowski wrote:
>
> Is J supposed to be a pure functional language, like Haskell? Outside of that
> narrow category functions like this are common, and hard to get around for io
> - input functions are like this.
>
I thought I’d look into this specific
It's all about tradeoffs.
Also, you did not provide a definition nor any examples for randel,
but I suspect that (rand =: randel bind l) will do what you are asking
for.
Good luck,
--
Raul
On Mon, Nov 27, 2017 at 12:03 PM, Andrew Dabrowski wrote:
> On 11/26/2017 01:27 PM, Raul Miller wrote:
>
On 11/26/2017 01:27 PM, Raul Miller wrote:
You don't really mean that. ;)
I do.
A function is a relationship between argument and result where there's
each argument has exactly one result.
That's the mathematical definition. I'm talking about programming.
So a function of no arguments
would
Nice,
Perhaps I should more time reading and less time at quick hacks. ;-)
Cheers, bob
> On Nov 27, 2017, at 8:36 AM, Raul Miller wrote:
>
> http://code.jsoftware.com/wiki/Essays/Odometer
>
> sper=: ] #.^:_1 i.@^~
>
> Thanks,
>
> --
> Raul
>
>
> On Mon, Nov 20, 2017 at 2:49 AM, 'Skip
http://code.jsoftware.com/wiki/Essays/Odometer
sper=: ] #.^:_1 i.@^~
Thanks,
--
Raul
On Mon, Nov 20, 2017 at 2:49 AM, 'Skip Cave' via Programming
wrote:
> How to find the permutations of y objects taken x at a time?
>
> 3 sper 4
>
> 0 1 2
>
> 0 1 3
>
> 0 2 1
>
> 0 2 3
>
> 0 3 1
>
> 0
A Jd update available. Main additions are upsert (new data inserted or
updated to table as appropriate based on key) and support of keys in delete
and update.
See release notes at:
http://code.jsoftware.com/wiki/Jd/Index
--
For in
sper=:>@(#~(-: ~.)@>)@,@{@($ <@i.)
10#.1+2 sper 4
12 13 14 21 23 24 31 32 34 41 42 43
10#.1+3 sper 4
123 124 132 134 142 143 213 214 231 234 241 243 312 314 321 324 341 342 412 413
421 423 431 432
Den 6:22 mandag den 27. november 2017 skrev Linda Alvord
:
It took me a while, but h
There is a way: you transpose the argument array, apply the desired
operation, then possibly transpose the result (as Brian's answer
indicates). An efficient implementation would do this under the covers
anyway for nearly all of the column-wise operations that can't be
implemented using rank.
The
Rank uses a "first dimension(s)" simplifying assumption, and and
columns are the last dimensions here.
You can use transpose to rearrange dimensions (though that's
unnecessary for this result). Or, you can use indexing (though that's
also unnecessary here).
That said, you can rather simply define
Well, and since Box is not a scalar verb alignment does not help us out
in this case. /Erling
Den 2017-11-27 kl. 10:12, skrev Erling Hellenäs:
Hi all!
It might seem strange that you can't easily address the columns with
Rank.
Alignment has a similar irregularity:
10 20 +i. 2 3
10 11 12
Hi all!
It might seem strange that you can't easily address the columns with Rank.
Alignment has a similar irregularity:
10 20 +i. 2 3
10 11 12
23 24 25
(i. 2 3)+10 20 30
|length error
| (i.2 3) +10 20 30
(i. 2 3)+10 20
10 11 12
23 24 25
Common first parts of the argument shapes
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