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Re: Wanted: List of intervals

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On 2/19/2017 5:31 PM, Robert Klemme wrote:
> On 19.02.2017 23:18, Eric Sosman wrote:
>> On 2/19/2017 5:13 PM, Arne Vajhøj wrote:
>>> On 2/19/2017 2:02 PM, Robert Klemme wrote:
>
>>>> Even for ints the approach seems pretty wasteful, if I understood you
>>>> correctly.
>>>
>>> I am not so sure about that. It is O(n) in number of intervals.
>>> No sorting required.
>
> When I said "wasteful" I thought of the memory usage.

But is it a problem?

>>     If I understand you correctly, the time should be O(n+m)
>> for n intervals containing a total of m bytes.  Memory use
>> would be O(biggestOffset - smallestOffset).
>
> That is what I would assume, too.  Runtime I would have said is O(n*m+o)
> with n = number of intervals, m = average length of interval and o =
> biggestOffset - smallestOffset (for the output generation).

See my reply to Eric. I don't think two variable big O is standard.

>                                                             It might
> still work well if the range is not too big.

Which is why I asked about the data size.

> For the time being, I would stick with the sorting approach as this has
> better predictable memory consumption.  There memory usage depends on
> the number of intervals input and not on the distribution of interval
> ends.  What I mean is, that for the bitset approach a single outlier is
> sufficient to make memory consumption explode.

If this data map can be in memory, then I would do an actual
comparison to one of the better sorting approaches. Because
of the different characteristics.

Arne

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Thread

Wanted: List of intervals v_borchert@despammed.com (Volker Borchert) - 2017-02-16 21:13 +0000
  Re: Wanted: List of intervals Arne Vajhøj <arne@vajhoej.dk> - 2017-02-16 17:11 -0500
    Re: Wanted: List of intervals v_borchert@despammed.com (Volker Borchert) - 2017-02-17 02:49 +0000
      Re: Wanted: List of intervals Arne Vajhøj <arne@vajhoej.dk> - 2017-02-16 22:32 -0500
        Re: Wanted: List of intervals v_borchert@despammed.com (Volker Borchert) - 2017-02-18 07:28 +0000
        Re: Wanted: List of intervals Robert Klemme <shortcutter@googlemail.com> - 2017-02-19 20:02 +0100
          Re: Wanted: List of intervals Arne Vajhøj <arne@vajhoej.dk> - 2017-02-19 17:13 -0500
            Re: Wanted: List of intervals Eric Sosman <esosman@comcast-dot-net.invalid> - 2017-02-19 17:18 -0500
              Re: Wanted: List of intervals Robert Klemme <shortcutter@googlemail.com> - 2017-02-19 23:31 +0100
                Re: Wanted: List of intervals Arne Vajhøj <arne@vajhoej.dk> - 2017-02-19 23:00 -0500
                Re: Wanted: List of intervals Arne Vajhøj <arne@vajhoej.dk> - 2017-02-19 23:09 -0500
              Re: Wanted: List of intervals Arne Vajhøj <arne@vajhoej.dk> - 2017-02-19 22:52 -0500
                Re: Wanted: List of intervals Eric Sosman <esosman@comcast-dot-net.invalid> - 2017-02-20 07:47 -0500
                Re: Wanted: List of intervals Andreas Leitgeb <avl@logic.at> - 2017-02-20 13:30 +0000
                Re: Wanted: List of intervals Arne Vajhøj <arne@vajhoej.dk> - 2017-02-20 08:51 -0500
  Re: Wanted: List of intervals Robert Klemme <shortcutter@googlemail.com> - 2017-02-16 23:18 +0100
    Re: Wanted: List of intervals v_borchert@despammed.com (Volker Borchert) - 2017-02-17 02:54 +0000
  Re: Wanted: List of intervals Martin Gregorie <martin@address-in-sig.invalid> - 2017-02-16 23:58 +0000
    Re: Wanted: List of intervals v_borchert@despammed.com (Volker Borchert) - 2017-02-17 03:30 +0000
      Re: Wanted: List of intervals Martin Gregorie <martin@address-in-sig.invalid> - 2017-02-17 12:10 +0000
        Re: Wanted: List of intervals v_borchert@despammed.com (Volker Borchert) - 2017-02-18 08:06 +0000
          Re: Wanted: List of intervals Martin Gregorie <martin@address-in-sig.invalid> - 2017-02-18 13:18 +0000
            Re: Wanted: List of intervals v_borchert@despammed.com (Volker Borchert) - 2017-02-18 19:58 +0000
              Re: Wanted: List of intervals Martin Gregorie <martin@address-in-sig.invalid> - 2017-02-18 20:45 +0000
              Re: Wanted: List of intervals Eric Sosman <esosman@comcast-dot-net.invalid> - 2017-02-19 10:57 -0500
                Re: Wanted: List of intervals Andreas Leitgeb <avl@logic.at> - 2017-02-19 17:36 +0000
  Re: Wanted: List of intervals a.laforgia@gmail.com - 2017-02-17 03:13 -0800
  Re: Wanted: List of intervals Eric Sosman <esosman@comcast-dot-net.invalid> - 2017-02-17 08:20 -0500
  Re: Wanted: List of intervals Roedy Green <inquiry@mindprod.com> - 2017-03-08 01:30 -0800
    Re: Wanted: List of intervals v_borchert@despammed.com (Volker Borchert) - 2017-03-09 19:32 +0000
      Re: Wanted: List of intervals Andreas Leitgeb <avl@logic.at> - 2017-03-09 23:05 +0000
        Re: Wanted: List of intervals v_borchert@despammed.com (Volker Borchert) - 2017-03-11 01:40 +0000
          Re: Wanted: List of intervals Andreas Leitgeb <avl@logic.at> - 2017-03-11 12:39 +0000
            Re: Wanted: List of intervals v_borchert@despammed.com (Volker Borchert) - 2017-03-11 18:15 +0000
              Re: Wanted: List of intervals Andreas Leitgeb <avl@logic.at> - 2017-03-11 21:47 +0000

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