I should have read Henry’s more carefully (sorry Henry), very similar approach,
bust the display of the ‘slices’ differs.
1 HR a
0 12
4 16
8 20
1 13
5 17
9 21
2 14
6 18
10 22
3 15
7 19
11 23
1 T a
0 1 2 3
12 13 14 15
4 5 6 7
16 17 18 19
8 9 10 11
20 21 22 23
> On
Very nice Ben, your TT is “hard coded to rank 3”, so fails on other than rank 3.
I “tinkered” by replacing 0 1 2 with i. $ $, and converted to tacit using 13 :
which worked, but less readable...
]a=:i.2 3 4
0 1 2 3
4 5 6 7
8 9 10 11
12 13 14 15
16 17 18 19
20 21 22 23
]b=:i.2 2
0
Still not quite sure what you mean, but how about:
]n =: i.2 3 4
0 1 2 3
4 5 6 7
8 9 10 11
12 13 14 15
16 17 18 19
20 21 22 23
1{0 T n NB. -: 1{n
12 13 14 15
16 17 18 19
20 21 22 23
1{1 T n
4 5 6 7
16 17 18 19
1{2 T n
1 5 9
13 17 21
If that's the one, then T would be:
T =: {{
This works!
Except the ordering of the axes is slightly unusual to my way of thinking.
For example suppose m=.i.3 3 3 is the “cube" be sliced and v is your verb.
Then the items of (0 v m) has successive items “going back” into the cube.
The items (1 v m) are the horizontal slices.
The items of (2
Getting close. But wish I could avoid the annoying “column” vectors on some
of the slices. This would be an annoying hurdle in the further slice
processing.
> On 7 Sep 2023, at 08:50, 'robert therriault' via Programming
> wrote:
>
> Is this closer to what you are looking for Piet?
>
>
Is this closer to what you are looking for Piet?
[n=: i. 3 3 3
0 1 2
3 4 5
6 7 8
9 10 11
12 13 14
15 16 17
18 19 20
21 22 23
24 25 26
slice=: ;@{"]:
0 (2 slice) n
0 1 2
9 10 11
18 19 20
1 (2 slice) n
3 4 5
12 13 14
21 22 23
2 (2 slice) n
6 7 8
15 16 17
24 25
Since you want all the slices, what you are looking for is a transpose.
Maybe
~.@(, i.@#) |: ]
Untested.
Henry Rich
On Wed, Sep 6, 2023, 6:10 PM Piet de Jong wrote:
> Here is my “wish"
>
> A dyadic (tacit) verb such that x v y gives all the slices of y along
> dimension x, where x is integer
Here is my “wish"
A dyadic (tacit) verb such that x v y gives all the slices of y along dimension
x, where x is integer. That is to say
i{ x v y
is slice i of the array y along dimension x.
Thanks for all your help!
> On 7 Sep 2023, at 08:04, 'robert therriault' via Programming
> wrote:
Or something like this?
[n =. i. 2 2 2
0 1
2 3
4 5
6 7
,./ n
0 1 4 5
2 3 6 7
($ $ (,@,./)) n
0 1
4 5
2 3
6 7
Cheers, bob
> On Sep 6, 2023, at 14:49, 'robert therriault' via Programming
> wrote:
>
> Hi Piet,
>
> Maybe show us what you would want to do with higher dimensions? Or a
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
> --
Hi Piet,
Maybe show us what you would want to do with higher dimensions? Or a less
symmetric 2 dimensional shape?
For shape 2 2, I would use the even simpler
|: m
0 2
1 3
Hope this helps.
Cheers, bob
> On Sep 6, 2023, at 14:26, Brian Schott wrote:
>
> ,./0 1 {"1 m
---
Does this help?
,./0 1 {"1 m
0 2
1 3
--
(B=) <-my sig
Brian Schott
--
For information about J forums see http://www.jsoftware.com/forums.htm
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
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