Thanks for all the great suggestions which has helped me a lot.
To my mind it does raise a couple of issues or questions.
I’ll stick my head out with them, knowing there might be much blowback.
But bear with me.
Slicing is a pretty intuitive concept so why should it be so intricate and
“hard"?
Maybe this is one of the reasons why J is not as popular as it ought to be.
I “love” J and always use it.
But I have not been able to convince a single other person to take it up.
I’m always wondering why? Does it mean it’s just too intricate for the
average Joe.
Most people on this forum I imagine love the intricacy and see it as an
enjoyable challenge.
But the average Joe just wants to solve problems as quickly as possible and get
on with life, not waste time on challenging intricate puzzles.
So perhaps J is too much “puzzle solving” rather than “problem solving”
Notwithstanding the above — I’ll always stick with J.
> On 8 Sep 2023, at 04:22, Jose Mario Quintana <jose.mario.quint...@gmail.com>
> wrote:
>
> Oops, I forgot o=. @:
>
> On Thu, Sep 7, 2023 at 1:27 PM Jose Mario Quintana <
> jose.mario.quint...@gmail.com> wrote:
>
>>> The order of the last two appear "unnatural". (To my way of thinking at
>> least)
>>> This seems to beg the question what is the natural order when slicing.
>>
>> The answer might depend on the intended usage of the verb that you have in
>> mind. If, for example,
>> you want to preserve the order of the remaining axes, then Henry's
>> suggestion modified by Raul would work,
>>
>> $ Y=. i.2 3 4 5
>> 2 3 4 5
>>
>> slicep=. ~.@(, i.@#@$) |: ]
>>
>> (0 1 2 3) ($ o slicep"0 _) Y
>> 2 3 4 5
>> 3 2 4 5
>> 4 2 3 5
>> 5 2 3 4
>>
>> Another possibility is to rotate the axes,
>>
>> slicer=. (|. i.@:#@:$@:]) |: ]
>>
>> (0 1 2 3) ($ o slicer"0 _) Y
>> 2 3 4 5
>> 3 4 5 2
>> 4 5 2 3
>> 5 2 3 4
>>
>> I hope this helps
>>
>>
>> On Wed, Sep 6, 2023 at 7:58 PM Piet de Jong <pietd...@gmail.com> wrote:
>>>
>>> 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 v m) are the vertical slices.
>>>
>>> The order of the last two appear "unnatural". (To my way of thinking at
>> least)
>>> This seems to beg the question what is the natural order when slicing.
>>>
>>>> On 7 Sep 2023, at 08:32, Henry Rich <henryhr...@gmail.com> wrote:
>>>>
>>>> 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 <pietd...@gmail.com> 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. 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 <
>>>>> programm...@jsoftware.com> 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 <
>>>>> programm...@jsoftware.com> wrote:
>>>>>>>
>>>>>>> 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 <schott.br...@gmail.com>
>> wrote:
>>>>>>>>
>>>>>>>> ,./0 1 {"1 m
>>>>>>>
>>>>>>>
>> ----------------------------------------------------------------------
>>>>>>> For information about J forums see
>> http://www.jsoftware.com/forums.htm
>>>>>>
>>>>>>
>> ----------------------------------------------------------------------
>>>>>> For information about J forums see
>> http://www.jsoftware.com/forums.htm
>>>>>
>>>>> ----------------------------------------------------------------------
>>>>> For information about J forums see
>> http://www.jsoftware.com/forums.htm
>>>>>
>>>> ----------------------------------------------------------------------
>>>> For information about J forums see http://www.jsoftware.com/forums.htm
>>>
>>> ----------------------------------------------------------------------
>>> For information about J forums see http://www.jsoftware.com/forums.htm
>>
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
