My solution is a quick hack and, I suppose, not easy to generalize.
Given a template
[T=:_3[\1 0 0 0 0 1 0 1 0
1 0 0
0 0 1
0 1 0
Rearrange (>:i.3 4) in a shape (4 3 3) noun according to that template.
Like
T ((-@#@])[\"1 ,@[ #^:_1"1|:@])>:i.3 4
1 0 0
0 0 5
0 9 0
2 0 0
0 0 6
0 10 0
3 0 0
0 0 7
0 11 0
4 0 0
0 0 8
0 12 0
(2 _2 {."0"1 |: arr1,:arr2) -: (1 0,: 0 1) ((-@#@])[\"1 ,@[
#^:_1"1|:@])>:i.2 3
1
R.E. Boss
-----Original Message-----
From: Programming <[email protected]> On Behalf Of R.E.
Boss
Sent: zaterdag 8 augustus 2020 11:02
To: [email protected]
Subject: Re: [Jprogramming] Constructing arrays by filling "templates"
2 _2 {."0"1 |: arr1,:arr2
R.E. Boss
-----Original Message-----
From: Programming <[email protected]> On Behalf Of
xash@?.land
Sent: zaterdag 8 augustus 2020 10:31
To: [email protected]
Subject: Re: [Jprogramming] Constructing arrays by filling "templates"
(0 0;1 1)}&(2 2$0)"1 (arr1 ,. arr2)
On Sat, 08 Aug 2020 10:13:08 +0200
Thomas Bulka <[email protected]> wrote:
> Hello everyone,
>
> I'm stuck with a problem, which (I think) should be really easy to
> solve in J, but I somehow am not able to do it. This is what I want to do:
>
> Let's assume I have two arrays:
>
> arr1 =: 1 2 3
> arr2 =: 4 5 6
>
> Now I do imagine some kind of "template" for a matrix which looks like
> this:
>
> X 0
> 0 Y
>
> What I want to do now is to construct a rank-3 array (shape 3 2 2), in
> which in each consecutive plane X has been replaced by one element of
> arr1 and Y has been replaced with one element of arr2. The final array
> should therefore be:
>
> finalarr =: 3 2 2 $ 1 0 0 4 2 0 0 5 3 0 0 6
>
> I'm looking for a sentence/function, that constructs an array of shape
> n
> 2 2 (in the example given above) where n equals # arr1 (we can assume
> that (# arr1) = # arr2). As I said - I've got the feeling that this
> should be not too hard to do in J, but somehow I'm stuck.
>
> Thank you very much for your help!
>
> Regards,
>
> Thomas
>
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