The rank of (>:@?) is 0; the rank of ([:>:?) is _ . So g creates fill
BEFORE >:, f does it AFTER >:.
g1=: 13 :'([:>:?)"0~>:i.# y'
g1 'abcde'
1 0 0 0 0
2 1 0 0 0
3 2 1 0 0
4 1 3 2 0
3 1 4 2 5
Henry Rich
On 2/28/2012 7:57 PM, Linda Alvord wrote:
>
> Henry, I have hit a snag in how @ is working in your program. Why are f
> and g different?
>
> (>:@?)~>:i.# 'abcde'
> 1 0 0 0 0
> 2 1 0 0 0
> 1 2 3 0 0
> 3 2 1 4 0
> 2 5 3 4 1
> ([:>:?)~>:i.# 'abcde'
> 1 1 1 1 1
> 2 1 1 1 1
> 1 2 3 1 1
> 1 3 4 2 1
> 2 5 1 3 4
> f=: 13 :'(>:@?)~>:i.# y'
> f 'abcde'
> 1 0 0 0 0
> 2 1 0 0 0
> 1 2 3 0 0
> 2 3 1 4 0
> 3 5 2 4 1
> g=: 13 :'([:>:?)~>:i.# y'
> g 'abcde'
> 1 1 1 1 1
> 1 2 1 1 1
> 3 2 1 1 1
> 1 3 4 2 1
> 2 3 5 4 1
> 5!:4<'f'
> -- [:
> │ -->:
> +- ~ --- @ -+- ?
> --+
> │ -- [:
> │ +->:
> L-----+ -- [:
> L-----+- i.
> L- #
> 5!:4<'g'
> -- [:
> │ -- [:
> +- ~ ------+->:
> --+ L- ?
> │ -- [:
> │ +->:
> L-----+ -- [:
> L----+- i.
> L- #
>
> Linda
>
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Henry Rich
> Sent: Monday, February 27, 2012 10:24 PM
> To: Programming forum
> Subject: Re: [Jprogramming] Challenge 6 Many Many Cherry Trees
>
> @ has its uses.
>
> tree =. (] ; ;/@,.)&' ' ;@({~ |.)"1>:@?~@>:@i.@#
> tree 'abcde'
> a
> b a
> b a c
> b c a d
> d b a e c
>
> Henry Rich
>
> On 2/27/2012 9:31 PM, Kip Murray wrote:
>> Here is how I would now do it, borrowing sh and the idea of using |.
>> from you, Linda.
>>
>> sh =: ] {~ # ? #
>>
>> gwk =: ([: |. [: - [: i. #) |."0 1 [: ([ , ' ' , ])/"1 [: sh\ sh
>>
>> gwk 'abcde'
>> b
>> d b
>> e d b
>> e a b d
>> b e d c a
>>
>> Kip
>>
>> On 2/27/2012 4:35 AM, Linda Alvord wrote:
>>> Here is my latest version which has simple tacit definitions. I was
>>> impressed with all the different strategies that were submitted and it
>>> should provide you with many options to consider and hopefully allow you
> to
>>> understand J better. I know I learned a lot and I still have many more
>>> versions to study.
>>>
>>> f=: 13 :'((#y)?#y){y'
>>> f
>>> ] {~ # ? #
>>> f 'abcde'
>>> deacb
>>>
>>> g=: 13 :'|. f \. f y'
>>> g
>>> [: |. [: f\. f
>>> g 'abcde'
>>> c
>>> ac
>>> dca
>>> eadc
>>> eacdb
>>>
>>> h=: 13 :'|.,"2 |:'' '',:|:|. g y'
>>> h
>>> [: |. [: ,"2 [: |: ' ' ,: [: |: [: |. g
>>> h 'abcde'
>>> a
>>> e a
>>> e a d
>>> d b a e
>>> a c e d b
>>>
>>> gw=: 13 :'(,.(1+#y)+i.#y)|."1 h y'
>>> gw
>>> ([: ,. (1 + #) + [: i. #) |."1 h
>>> gw 'cherrytrees'
>>> e
>>> c e
>>> c e r
>>> e c h r
>>> r y h c e
>>> y h t r c e
>>> r t r c e y h
>>> y c r h t s e r
>>> r h e y t r c e s
>>> c r t e h s r r y e
>>> t s e e y r r h e r c
>>>
>>> All the tacit expressions are quite simple looking. If I misses some of
> your
>>> good ideas please let me know. Maybe I can get rid of some of the
>>> parentheses in the final verb. I anticipate having some questions about
> some
>>> of the strategies you've used when I look at them more carefully.
>>>
>>> Linda
>>>
>>>
>>> -----Original Message-----
>>> From: [email protected]
>>> [mailto:[email protected]] On Behalf Of Linda Alvord
>>> Sent: Sunday, February 26, 2012 3:33 PM
>>> To: 'Programming forum'
>>> Subject: Re: [Jprogramming] Challenge 6 Many Many Cherry Trees
>>>
>>> I noticed that all the first group begin with c but I didn't notice
> that
>>> all the last group end with d
>>>
>>> I don't often find my own problems.
>>>
>>> Linda
>>>
>>> -----Original Message-----
>>> From: [email protected]
>>> [mailto:[email protected]] On Behalf Of Linda Alvord
>>> Sent: Sunday, February 26, 2012 6:10 AM
>>> To: 'Programming forum'
>>> Subject: Re: [Jprogramming] Challenge 6 Many Many Cherry Trees
>>>
>>> Here's more I don't understand.
>>>
>>> p=: 13 :'((#y)?#y){y'
>>> p\p 'abcde'
>>> e
>>> eb
>>> bea
>>> bdea
>>> baedc
>>>
>>> Why is this a domain error?
>>>
>>> (((#y)?#y){y)\((#y)?#y){y=:'abcde'
>>> |domain error
>>> | (((#y)?#y){y)\((#y)?#y){y=:'abcde'
>>>
>>> Why is each row not scrambled in the first example but they are in the
>>> second?
>>>
>>> ]\ 'cbaed'
>>> c
>>> cb
>>> cba
>>> cbae
>>> cbaed
>>>
>>> ]\. 'cbaed'
>>> cbaed
>>> baed
>>> aed
>>> ed
>>> d
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: [email protected]
>>> [mailto:[email protected]] On Behalf Of Raul Miller
>>> Sent: Friday, February 24, 2012 11:57 AM
>>> To: Programming forum
>>> Subject: Re: [Jprogramming] Challenge 6 Many Many Cherry Trees
>>>
>>> On Fri, Feb 24, 2012 at 11:39 AM, Kip Murray<[email protected]> wrote:
>>>> Raul has explained "0 _ . In effect I was re-inventing<\. (box suffix)
> .
>>>
>>> Or, more specifically:
>>> ]\. 'cbaed'
>>>
>> ----------------------------------------------------------------------
>> 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
