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Groups > comp.lang.java.programmer > #36682 > unrolled thread

How to parse an array?

Started byEric Douglas <e.d.programmer@gmail.com>
First post2017-06-20 12:18 -0700
Last post2017-06-25 12:20 +0200
Articles 5 on this page of 25 — 8 participants

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  How to parse an array? Eric Douglas <e.d.programmer@gmail.com> - 2017-06-20 12:18 -0700
    Re: How to parse an array? Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2017-06-20 14:49 -0500
    Re: How to parse an array? Arne Vajhøj <arne@vajhoej.dk> - 2017-06-20 16:15 -0400
    Re: How to parse an array? Eric Sosman <esosman@comcast-dot-net.invalid> - 2017-06-20 16:23 -0400
    Re: How to parse an array? Robert Klemme <shortcutter@googlemail.com> - 2017-06-24 12:02 +0200
      Re: How to parse an array? Eric Douglas <e.d.programmer@gmail.com> - 2017-06-26 05:10 -0700
        Re: How to parse an array? Eric Sosman <esosman@comcast-dot-net.invalid> - 2017-06-26 09:36 -0400
          Re: How to parse an array? Eric Douglas <e.d.programmer@gmail.com> - 2017-06-26 07:47 -0700
            Re: How to parse an array? Martin Gregorie <martin@address-in-sig.invalid> - 2017-06-26 15:47 +0000
          Re: How to parse an array? Arne Vajhøj <arne@vajhoej.dk> - 2017-06-26 20:37 -0400
        Re: How to parse an array? lewbloch@gmail.com - 2017-06-27 12:29 -0700
          Re: How to parse an array? Eric Douglas <e.d.programmer@gmail.com> - 2017-06-27 12:50 -0700
            Re: How to parse an array? Martin Gregorie <martin@address-in-sig.invalid> - 2017-06-27 20:05 +0000
              Re: How to parse an array? Eric Douglas <e.d.programmer@gmail.com> - 2017-06-27 14:01 -0700
                Re: How to parse an array? Martin Gregorie <martin@address-in-sig.invalid> - 2017-06-27 22:34 +0000
                  Re: How to parse an array? Eric Douglas <e.d.programmer@gmail.com> - 2017-06-28 05:10 -0700
                    Re: How to parse an array? Martin Gregorie <martin@address-in-sig.invalid> - 2017-06-28 19:09 +0000
                      Re: How to parse an array? Eric Douglas <e.d.programmer@gmail.com> - 2017-06-28 13:02 -0700
                        Re: How to parse an array? Martin Gregorie <martin@address-in-sig.invalid> - 2017-06-28 21:55 +0000
                          Re: How to parse an array? Eric Douglas <e.d.programmer@gmail.com> - 2017-06-30 06:10 -0700
                            Re: How to parse an array? Martin Gregorie <martin@address-in-sig.invalid> - 2017-06-30 16:52 +0000
    Re: How to parse an array? Jerry Stuckle <jstucklex@attglobal.net> - 2017-06-24 16:34 -0400
      Re: How to parse an array? Martin Gregorie <martin@address-in-sig.invalid> - 2017-06-24 22:42 +0000
        Re: How to parse an array? Jerry Stuckle <jstucklex@attglobal.net> - 2017-06-24 20:05 -0400
        Re: How to parse an array? Robert Klemme <shortcutter@googlemail.com> - 2017-06-25 12:20 +0200

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#36779

FromMartin Gregorie <martin@address-in-sig.invalid>
Date2017-06-30 16:52 +0000
Message-ID<oj5vjn$n4e$1@dont-email.me>
In reply to#36776
On Fri, 30 Jun 2017 06:10:48 -0700, Eric Douglas wrote:

> Nice, I'm not sure I did exactly everything you were suggesting but it
> seems I get barely a 1 second delay now on clicking a column header to
> sort the table.  That is on a full table, tested 74,707 rows, 24
> columns, totaling 1,792,968 cells.
> 
> That is with the full sort processing, I can click one column to be
> ascending or descending, then a second column with duplicate values
> which remain sorted on the first column as secondary.
> 
> That is with full search capability.  I have 2 JTextComponent controls
> with key listeners that update the table search, each linked to list
> buttons where I can select to search on any specific column or all
> columns.  All cells indexed, with wildcards.
> 
> That includes mixed cell styles.  Some cells are just text, some are
> masked numbers, some are masked dates, some are list buttons.

Excellent! I'm really pleased to hear that the change has got you a 300% 
speedup.


-- 
martin@   | Martin Gregorie
gregorie. | Essex, UK
org       |

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#36715

FromJerry Stuckle <jstucklex@attglobal.net>
Date2017-06-24 16:34 -0400
Message-ID<oimi4i$9ko$1@jstuckle.eternal-september.org>
In reply to#36682
On 6/20/2017 3:29 PM, Stefan Ram wrote:
> Eric Douglas <e.d.programmer@gmail.com> writes:
>> I'm writing a method to take 2 arrays and return the subset of the first array. 
> 
>   »The subset of the first array« makes no sense in English,
>   because
>

It makes perfect sense in the mathematical realm.  A set is a group of
values (or similar).  A subset is another group of values, all of which
are members of the original set.  The subset may contain all of the
values in the original set, or only some of the values in the original
set.  But it does not contain any values not in the original set.

In this particular case, a subset of the array would be another array
containing some (or all) of the values in the original array.

His English is very clear.  It's not his fault your understanding is
lacking.

-- 
==================
Remove the "x" from my email address
Jerry Stuckle
jstucklex@attglobal.net
==================

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#36716

FromMartin Gregorie <martin@address-in-sig.invalid>
Date2017-06-24 22:42 +0000
Message-ID<oimps5$g3v$1@dont-email.me>
In reply to#36715
On Sat, 24 Jun 2017 16:34:08 -0400, Jerry Stuckle wrote:

> On 6/20/2017 3:29 PM, Stefan Ram wrote:
>> Eric Douglas <e.d.programmer@gmail.com> writes:
>>> I'm writing a method to take 2 arrays and return the subset of the
>>> first array.
>> 
>>   »The subset of the first array« makes no sense in English,
>>   because
>>
>>
> It makes perfect sense in the mathematical realm.  A set is a group of
> values (or similar).  A subset is another group of values, all of which
> are members of the original set.  The subset may contain all of the
> values in the original set, or only some of the values in the original
> set.  But it does not contain any values not in the original set.
>
However, this doesn't apply to the OP's example code. His larger array 
contains alphabetic valueds, while the second list contains integer 
values, IOW it is not a subset of the first array.
  
> In this particular case, a subset of the array would be another array
> containing some (or all) of the values in the original array.
>
But that's not what it contains. 

In fact it looks as though its meant to  be a list of subscripts 
referencing the first array. I don't know what I'd call it other than a 
list of subscripts, but it clearly doesn't match your definition of a 
subset.


-- 
martin@   | Martin Gregorie
gregorie. | Essex, UK
org       |

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#36717

FromJerry Stuckle <jstucklex@attglobal.net>
Date2017-06-24 20:05 -0400
Message-ID<oimug5$tk5$1@jstuckle.eternal-september.org>
In reply to#36716
On 6/24/2017 6:42 PM, Martin Gregorie wrote:
> On Sat, 24 Jun 2017 16:34:08 -0400, Jerry Stuckle wrote:
> 
>> On 6/20/2017 3:29 PM, Stefan Ram wrote:
>>> Eric Douglas <e.d.programmer@gmail.com> writes:
>>>> I'm writing a method to take 2 arrays and return the subset of the
>>>> first array.
>>>
>>>   »The subset of the first array« makes no sense in English,
>>>   because
>>>
>>>
>> It makes perfect sense in the mathematical realm.  A set is a group of
>> values (or similar).  A subset is another group of values, all of which
>> are members of the original set.  The subset may contain all of the
>> values in the original set, or only some of the values in the original
>> set.  But it does not contain any values not in the original set.
>>
> However, this doesn't apply to the OP's example code. His larger array 
> contains alphabetic valueds, while the second list contains integer 
> values, IOW it is not a subset of the first array.
>   
>> In this particular case, a subset of the array would be another array
>> containing some (or all) of the values in the original array.
>>
> But that's not what it contains. 
> 
> In fact it looks as though its meant to  be a list of subscripts 
> referencing the first array. I don't know what I'd call it other than a 
> list of subscripts, but it clearly doesn't match your definition of a 
> subset.
> 
> 

But yes, it does.  He has an ArrayList with values.  This is a set.  He
wants another ArrayList containing selected values from the first.  That
is a subset.

The OP is discussing the design.  Whether it uses ArrayLists or any
other collections is an implementation detail.

-- 
==================
Remove the "x" from my email address
Jerry Stuckle
jstucklex@attglobal.net
==================

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#36719

FromRobert Klemme <shortcutter@googlemail.com>
Date2017-06-25 12:20 +0200
Message-ID<er9h3nFqgrmU1@mid.individual.net>
In reply to#36716
On 25.06.2017 00:42, Martin Gregorie wrote:
> On Sat, 24 Jun 2017 16:34:08 -0400, Jerry Stuckle wrote:
> 
>> On 6/20/2017 3:29 PM, Stefan Ram wrote:
>>> Eric Douglas <e.d.programmer@gmail.com> writes:
>>>> I'm writing a method to take 2 arrays and return the subset of the
>>>> first array.
>>>
>>>    »The subset of the first array« makes no sense in English,
>>>    because
>>>
>>>
>> It makes perfect sense in the mathematical realm.  A set is a group of
>> values (or similar).  A subset is another group of values, all of which
>> are members of the original set.  The subset may contain all of the
>> values in the original set, or only some of the values in the original
>> set.  But it does not contain any values not in the original set.
>>
> However, this doesn't apply to the OP's example code. His larger array
> contains alphabetic valueds, while the second list contains integer
> values, IOW it is not a subset of the first array.

No, but the result is.

>> In this particular case, a subset of the array would be another array
>> containing some (or all) of the values in the original array.
>>
> But that's not what it contains.

I am with Jerry here: the result ("retval") does indeed contain a subset 
of the entries in "list1", because it does contain some values from it.

> In fact it looks as though its meant to  be a list of subscripts
> referencing the first array. I don't know what I'd call it other than a
> list of subscripts, but it clearly doesn't match your definition of a
> subset.

Yes, "list2" is a list of subscripts or indexes.  But Eric never talked 
about that as a subset.  He wants to _return_ a "subset of the first 
array" (see above) - "list1" and "list2" are obviously the inputs.

You may claim that Eric's wording is imprecise (e.g. he does not explain 
the role of sorting the result) and a lot of context is lacking which 
prevents us from fully assessing the fitness of his approach - but the 
problem does make sense and he specifically does not abuse the term 
"subset".

Kind regards

	robert

-- 
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/

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