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Re: How to parse an array?

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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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Thread

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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