Ben, Jose, Raul, Roger,
Thanks so much for your efforts in providing various solutions to my index
problem.
I am continually amazed at the diversity of options that J's primitives
provide to approach problems.
Ben:
4$.$. i.3 4 NB. Unboxed using Sparse
NB. Wow! I would have never even thought of
Note that the row/column indices correspond to the decode of the
integer indices.
3 4 #: i. 3 4
0 0
0 1
0 2
0 3
1 0
1 1
1 2
1 3
2 0
2 1
2 2
2 3
Likewise, the integer indices correspond to the encode of the
row/column indices:
3 4 #. 3 4 #: i. 3 4
0 1 2 3
4 5 6 7
8 9 10 11
All that r
Yes. I gathered that. It would be nice of a warning about coreq updates.
On Tue, Jan 10, 2017 at 5:07 PM, bill lam wrote:
> It needs exiting once to complete installation. The changes are switching
> to 11!:x for calling wd and gl2.
>
>
> On 11 Jan, 2017 1:20 am, "Don Guinn" wrote:
>
> > Reinst
Alternatively,
{ i.&.> 2 3
┌───┬───┬───┐
│0 0│0 1│0 2│
├───┼───┼───┤
│1 0│1 1│1 2│
└───┴───┴───┘
{ i.&.> 2 3 4
┌─┬─┬─┬─┐
│0 0 0│0 0 1│0 0 2│0 0 3│
├─┼─┼─┼─┤
│0 1 0│0 1 1│0 1 2│0 1 3│
├─┼─┼─┼─┤
│0 2 0│0 2 1│0 2 2│0 2 3│
└─┴─┴─┴─┘
It needs exiting once to complete installation. The changes are switching
to 11!:x for calling wd and gl2.
On 11 Jan, 2017 1:20 am, "Don Guinn" wrote:
> Reinstalling J corrected the problem.
> -- Forwarded message --
> From: "Don Guinn"
> Date: Jan 10, 2017 9:58 AM
> Subject: J
"Ultimately, I want to design a verb bix, that will take a list of
dimensions of any length, and generate boxed indices of the resulting
array."
bix 10
┌─┬─┬─┬─┬─┬─┬─┬─┬─┬─┐
│0│1│2│3│4│5│6│7│8│9│
└─┴─┴─┴─┴─┴─┴─┴─┴─┴─┘
bix 3 4
┌───┬───┬───┬───┐
│0 0│0 1│0 2│0 3│
├───┼───┼───┼───┤
│1 0│1 1│1
There is also:
a =: i.3 4
{i. each $ a
+---+---+---+---+
|0 0|0 1|0 2|0 3|
+---+---+---+---+
|1 0|1 1|1 2|1 3|
+---+---+---+---+
|2 0|2 1|2 2|2 3|
+---+---+---+---+
Ben
From: Programming [programming-boun...@forums.jsoftware.com] on behalf of Skip
For a little more color: previous discussion:
http://www.jsoftware.com/pipermail/programming/2014-March/035994.html
I'm going to switch back to using i. for this
On Tue, Jan 10, 2017 at 6:15 PM, Joe Bogner wrote:
> Looks like it is due to the boxing. Please disregard
>
> http://code.jsoftware
Looks like it is due to the boxing. Please disregard
http://code.jsoftware.com/wiki/Vocabulary/comma#dyadic mentions that append
in place special code does not work for boxes
f4 =: 3 : 0
a=:a:
for_n. (i. y) do. a=:a,( wrote:
> Why are these so different in execution speed? I'm surprised assemb
How about:
4$.$. i.3 4
0 1
0 2
0 3
1 0
1 1
1 2
1 3
2 0
2 1
2 2
2 3
4$.$. i.2 3 4
0 0 1
0 0 2
0 0 3
0 1 0
0 1 1
0 1 2
0 1 3
0 2 0
0 2 1
0 2 2
0 2 3
1 0 0
1 0 1
1 0 2
1 0 3
1 1 0
1 1 1
1 1 2
1 1 3
1 2 0
1 2 1
1 2 2
1 2 3
(thanks to Marshall Lochbaum iirc)
Ben
Given a 3x4 matrix:
a =. i. 3 4
a
0 1 2 3
4 5 6 7
8 9 10 11
I can get the horizontal indices:
4|a
0 1 2 3
0 1 2 3
0 1 2 3
How do I get the vertical indices?
3?a NB. The question-mark represents the unknown verb
0 0 0 0
1 1 1 1
2 2 2 2
Ultimately, I want
Why are these so different in execution speed? I'm surprised assembling
that linking boxes makes that much of a difference over an number. I need
it to be boxed because I'm going to something more complex with each
iteration.
f1 =: 3 : '(>: each)^:(:)^:(http://www.jsoftware.com/forums.htm
Reinstalling J corrected the problem.
-- Forwarded message --
From: "Don Guinn"
Date: Jan 10, 2017 9:58 AM
Subject: J Android error
To: "Programming forum"
Cc:
Just installed latest updates for J on Android. Got following error. Left
> in current locale of z.
>
> |domain error:
Just installed latest updates for J on Android. Got following error. Left
in current locale of z.
|domain error: wd
| ver=.wd'version'
--
For information about J forums see http://www.jsoftware.com/forums.htm
It seems my AtDot from long ago is doing the trick.
AtDot=: 2 : (':';'[ v^:_1 u@v')
0 0 1 0 0 1 >:@] AtDot # i.6
0 0 3 0 0 6
/Erling
On 2017-01-01 21:40, David Koppenhoefer wrote:
Reading the wonderful NuVoc I found the gem that dyadic # has an inverse
- it can therefore be used in &. like
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