what I meant is there is no automagical colating sequence
u: 197 65
ÅA
(1 u: 'B') (\: -&{. /:)@,&< 4 u: 197
1
(u: 66) (\: -&{. /:)@,&< u: 197
1
'B' (\: -&{. /:)@,&< 'A'
_1
I understand (recently learned) that universal collating sequences don't exist
as Swedes and Germans sort differently.
----- Original Message -----
From: Raul Miller <[email protected]>
To: Programming forum <[email protected]>
Cc:
Sent: Thursday, November 13, 2014 12:09 PM
Subject: Re: [Jprogramming] Need analog strcmp-function verb
I was initially puzzled by what you meant by "/: doesn't really work
for unicode".
But then I realized, that while things like...
$u: 9824 9829 9830 9827
4
u: 9824 9829 9830 9827
♠♥♦♣
/: u: 9824 9829 9830 9827
0 3 1 2
... do work, it is possible to sort the octets of the utf-8
representation of unicode and that can result in a non-unicode
sequence of octets.
/: 8 u: u: 9824 9829 9830 9827
1 4 7 10 2 11 5 8 0 3 6 9
/:~ 8 u: u: 9824 9829 9830 9827
[garbage]
Then again, you do not need to sort the octets and expect them to be
meaningful unicode.
/: 7 u: 8 u: u: 9824 9829 9830 9827
0 3 1 2
That said, this kind of a distinction matters quite a lot to
implementers and is likely to escape the awareness of people doing the
specifications.
Thanks,
--
Raul
On Thu, Nov 13, 2014 at 11:35 AM, 'Pascal Jasmin' via Programming
<[email protected]> wrote:
> /: doesn't really work for unicode, unless you convert unicode into an
> integer mapping and then use that as x for /:
>
> /: has the advantage of working with boxed data, or "records"/lists
>
> With those limitations we could think of using ,:&(a.&i.)&": to build numeric
> arrays to compare, but that runs into rank quirks with single "character"
> left sides, so boxing seems simpler with:
>
> '3'([: ,/&> ,&<&(a.&i.)&":) '3a'
> 51 0
> 51 97
>
>
> You gain the "benefit" of being able to treat original integers as strings.
>
> comparing then with < and > is a little harder due to handling tie breaks,
> and you are duplicating the real work of /: in doing so?
>
> '3'([: * [: -~/ 1 i."1~ [: (</ ,: >/ ) [: ,/&> ,&<&(a.&i.)&":) '3a'
>
>
> ----- Original Message -----
> From: bill lam <[email protected]>
> To: Programming forum <[email protected]>
> Cc:
> Sent: Thursday, November 13, 2014 8:11 AM
> Subject: Re: [Jprogramming] Need analog strcmp-function verb
>
> Sorting is an expensive operation. Could it be only once?
>
> On Thu, Nov 13, 2014 at 8:43 PM, Henry Rich <[email protected]> wrote:
>> strcmp =: (\: -&{. /:)@,&<
>>
>> Henry Rich
>>
>>
>> On 11/13/2014 5:35 AM, Jan-Pieter Jacobs wrote:
>>>
>>> J has total ordering (meaning anything can be sorted):
>>> http://www.jsoftware.com/jwiki/Essays/The%20TAO%20of%20J
>>>
>>> Using the verbs listed there you can define:
>>>
>>> strcmp =: _1 0 1 #~ gt , eq , lt
>>> gt =: 1 0 -: /:@,&<
>>> eq =: -:!.0
>>> lt =: 1 0 -: \:@,&<
>>>
>>> ('a a a ac') strcmp&>&:;: 'ab aa a ab'
>>>
>>> 1
>>>
>>> 1
>>>
>>> 0
>>>
>>> _1
>>>
>>>
>>> 2014-11-13 11:16 GMT+01:00 Sergey Kamenev <[email protected]>:
>>>
>>>> Hello folks!
>>>>
>>>> Need strcmp verb
>>>> http://php.net/manual/function.strcmp.php
>>>>
>>>> 'a' strcmp 'ab'
>>>> 1
>>>>
>>>> 'a' strcmp 'aa'
>>>> 1
>>>>
>>>> 'a' strcmp 'a'
>>>> 0
>>>>
>>>> 'ac' strcmp 'ab'
>>>> _1
>>>>
>>>> May be you have implementation of this verb?
>>>>
>>>> Thank you!
>>>> Sergey
>>>> ----------------------------------------------------------------------
>>>> For information about J forums see http://www.jsoftware.com/forums.htm
>
>
>
>>>>
>>> ----------------------------------------------------------------------
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>>>
>> ----------------------------------------------------------------------
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> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
>
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