Dear J enthusiasts,
What is your recommended way to call linux command/invoke program from J and
capture result? Let's say I want to invoke
*dd if=/dev/urandom bs=100 count=1*
Could you point me to example showing how to deal with bigger streams in J,
ie. process the source by chunks.
Thanks a l
J built in primitives can only work with regular files. Those can be seek
to the end. If it is then you can use index read or map the file to a J
noun. See memory mapped file lab or documentation.
On Fri, 24 Jun 2022 at 5:10 PM Pawel Jakubas
wrote:
> Dear J enthusiasts,
>
> What is your recomm
Sorry for late posting - apparently a problem with my broadband
provider's server.
Yes, it can be worth doing a limited feasibility check on your input.
Every column,
row and small box should have no repeated elements apart from the "missing"
indicator, such as 0 or perhaps one of '.-*0' ,
But, in addition to J's built in primitives, you can use code in
"dlls" (*.so files, on Linux).
See, for example: https://code.jsoftware.com/wiki/Guides/DLLs/Calling_DLLs
Thus, for example, you could use libc's fread if you wanted.
--
Raul
On Fri, Jun 24, 2022 at 5:56 AM bill lam wrote:
>
> J
I went to a "print out the hexadoku page" on that site, and did a
right click save-as on the resulting html page.
Extracting the puzzle seems straight forward (but beware email induced
line wrap):
htm=: fread '~/Downloads/16x16 sudoku, Hexadoku puzzle to print_ level
beginner, #1.html'
extract=:
Perhaps I was just unlucky, but I tried an iPad-type “share” to Documents,
which didn’t produce a useable file; later downloaded a pdf with the Windows
11 laptop. Copy-paste from adobe worked to the extent that multi-spaces became
single spaces,
which I then filled out by hand!
Anyway, I’ll
Ahhh... I hadn’t spotted “hexadoku” - I’d used “alphadoku”. We shall see in
due course!
M
Sent from my iPad
> On 24 Jun 2022, at 12:24, 'Mike Day' via Programming
> wrote:
>
> Perhaps I was just unlucky, but I tried an iPad-type “share” to Documents,
> which didn’t produce a useable file;
thanks for the pointers.
I will know now how to deal with shared libraries.
But what about the example I gave, ie. "*dd if=/dev/urandom bs=100 count=1*"
?
How to invoke it in a simpliest possible way?
Kindest regards,
Pawel
--
F
Mike,
To check the inputs of a grid I found that Hui's verb 'ok' works for me.
Your revision of the verb 'solve' looks problematic to me because it
suggests there is a dyadic version, but I could only find a monadic version
from your earlier post. Also there is an example in this post using a ver
Raul,
Your script for parsing the printed grid looks very effective, but I could
not find an example html page at
https://www.sudoku-puzzles-online.com/ to try it with.
Instead I found a page like the following one and simply
selected/highlighted the grid from the screen and copy-pasted that into
Sorry, Brian. I thought I’d removed the h from solveh- the h was for Hui, but
not
relevant for the version I prepared for this example. I had another “solve” in
a larger
script.
As for the dyadic version, the line below solve =: 3 : 0 , and before the :
line, shows a
default lhs argum
Mike,
What I mean is, I never saw a line starting with : in your solve script.
Maybe I missed a script or email somewhere?
On Fri, Jun 24, 2022 at 1:31 PM 'Mike Day' via Programming <
programm...@jsoftware.com> wrote:
> Sorry, Brian. I thought I’d removed the h from solveh- the h was for
> Hui,
require 'task'
shell 'dd if=/dev/urandom bs=100 count=1'
I hope this helps,
--
Raul
On Fri, Jun 24, 2022 at 9:33 AM Pawel Jakubas wrote:
>
> thanks for the pointers.
>
> I will know now how to deal with shared libraries.
>
> But what about the example I gave, ie. "*dd if=/dev/urandom bs=100 c
Brian: the html page I saved was the html from the
https://www.sudoku-puzzles-online.com/cgi-bin/hexadoku/print-a-grid-hexadoku.cgi
page which in turn was generated from the [print] button at
https://www.sudoku-puzzles-online.com/hexadoku/print-hexadoku.php
Looking at
view-source:https://www.sudo
Pawel Jakubas asked:
>
> What is your recommended way to call linux command/invoke program
> from J and capture result? Let's say I want to invoke
> *dd if=/dev/urandom bs=100 count=1*
NB. 2!:0 returns stdout, stderr goes to the console
s =. 2!:0 'dd if=/dev/urandom bs=100 count=1'
1+0
2!:0'dd if=/dev/urandom bs=100 count=1'
1+0 records in
1+0 records out
100 bytes copied, 0.000193284 s, 517 kB/s
@�!" `�)� �fg�
┬��R �`�D��w��r�Ĵ+�H��H�
;┘h`(wB�wS��̎��
J�$�F��` 3��<`/�[��X@�l=��ٝe�y��
|Date: Fri, 24 Jun 2022 11:12:11 +0200
|From: Pawel Jakubas
|To: programm...@jsoftwa
On Fri, Jun 24, 2022 at 4:12 PM wrote:
> NB. 2!:0 returns stdout, stderr goes to the console
> s =. 2!:0 'dd if=/dev/urandom bs=100 count=1'
...
Thanks, I keep forgetting that 2!:0 works on linux.
(I guess it's kind of a mess that we have to use require'task' for windows.)
Thanks again,
A slightly more careful addition to prior message. I'll guess that
stderr was displayed, not caught by the shell command &> .
A=:2!:0'dd if=/dev/urandom bs=100 count=1'
1+0 records in
1+0 records out
100 bytes copied, 6.2358e-05 s, 1.6 MB/s
datatype A
literal
a.i.A
133 162 11 135 17
If you do not want the stder messages, you can use 2>/dev/null in your
command line:
#A=: 2!:0'dd if=/dev/urandom bs=11 count=1 2>/dev/null'
11
FYI,
--
Raul
On Fri, Jun 24, 2022 at 5:30 PM David Lambert wrote:
>
> A slightly more careful addition to prior message. I'll guess that
> stder
It looks as if some line-wrapping hid the singleton " : " at the end of
the preceding line.
Sorry I didn't spot it!
M
On 24/06/2022 18:37, Brian Schott wrote:
Mike,
What I mean is, I never saw a line starting with : in your solve script.
Maybe I missed a script or email somewhere?
On Fri, Jun
In this episode, a behind-the-scenes look at the Array Cast podcast.
Host: Conor Hoekstra Panel: Adám Brudzewsky, Stephen Taylor and Bob
Therriault.
https://www.arraycast.com/episodes/episode30-our-first-year
Cheers, bob
--
Fo
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