Re: Simple Sort - the smallest sorting routine?

From	Bernd Paysan <bernd.paysan@gmx.de>
Newsgroups	comp.lang.forth
Subject	Re: Simple Sort - the smallest sorting routine?
Date	2013-07-06 13:45 +0200
Organization	1&1 Internet AG
Message-ID	<kr901e$bk8$1@online.de> (permalink)
References	(8 earlier) <18f27274-dc2c-4cda-95e7-a3526b319786@googlegroups.com> <bde62eee-6e01-422c-b2c6-104080ee6855@googlegroups.com> <1d68e6bc-f11c-4bd8-a907-fc819f0d4373@googlegroups.com> <ef461c0a-4955-4104-a17c-2f669ebfccfa@googlegroups.com> <kr7jth$ref$1@dont-email.me>

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Alex McDonald wrote:
> But quicksort is, on the average, much faster that heapsort. Only when
> the input is sorted is quicksort appreciably slower (for large n, yes, it
> can be hugely expensive) so it's fairly standard practice to swap the
> imput before starting.

The "standard pratice" for quicksort I know is to take the pivot right from 
the middle of the to-be-sorted array.  That way, it is highly unlikely that 
the worst case behavior will show, and sorting sorted inputs that way works 
quite well.

If you want predictable time behavior, I would implement merge-sort (also 
maybe for an interview).  Mergesort is very easy to remember:

Split the input into two halfs, sort both recursively, and then merge them 
together.  Mergesort doesn't work in-place, so you need temporary storage.  
There is a short-cut for mergesort for pre-sorted arrays: Compare the last 
element of the sorted first half with the first element of the sorted second 
half - if that is smaller, don't merge, just append.

If you want better than O(n log n) for average case, use bucketsort.  It's 
also not in-place, but for strings (the usual sort case) it has the big 
advantage of not requiring compares - you use the letters as buckets, and 
you just have to take the head of the string to decide which bucket the 
string should go into.

Bucketsort also works very well for highly parallel systems (for big data - 
many machines): You do the split into many buckets in parallel, and then do 
the merging/sorting of each bucket in parallel, too.

-- 
Bernd Paysan
"If you want it done right, you have to do it yourself"
http://bernd-paysan.de/

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Simple Sort - the smallest sorting routine? The Beez <the.beez.speaks@gmail.com> - 2013-06-25 13:12 -0700
  Re: Simple Sort - the smallest sorting routine? Mark Wills <markrobertwills@yahoo.co.uk> - 2013-06-25 23:48 -0700
    Re: Simple Sort - the smallest sorting routine? The Beez <the.beez.speaks@gmail.com> - 2013-06-26 09:11 -0700
  Re: Simple Sort - the smallest sorting routine? m.a.m.hendrix@tue.nl - 2013-06-26 02:03 -0700
  Re: Simple Sort - the smallest sorting routine? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-06-26 11:25 -0500
    Re: Simple Sort - the smallest sorting routine? the_gavino_himself <visphatesjava@gmail.com> - 2013-06-26 12:36 -0700
      Re: Simple Sort - the smallest sorting routine? "Elizabeth D. Rather" <erather@forth.com> - 2013-06-26 09:49 -1000
    Re: Simple Sort - the smallest sorting routine? "WJ" <w_a_x_man@yahoo.com> - 2013-06-26 20:24 +0000
  Re: Simple Sort - the smallest sorting routine? "WJ" <w_a_x_man@yahoo.com> - 2013-06-26 20:23 +0000
    Re: Simple Sort - the smallest sorting routine? Alex McDonald <blog@rivadpm.com> - 2013-06-26 13:35 -0700
      Re: Simple Sort - the smallest sorting routine? hughaguilar96@yahoo.com - 2013-06-26 16:37 -0700
        Re: Simple Sort - the smallest sorting routine? The Beez <the.beez.speaks@gmail.com> - 2013-06-27 01:31 -0700
          Re: Simple Sort - the smallest sorting routine? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-06-27 04:04 -0500
          Re: Simple Sort - the smallest sorting routine? hughaguilar96@yahoo.com - 2013-06-30 09:27 -0700
            Re: Simple Sort - the smallest sorting routine? Alex McDonald <blog@rivadpm.com> - 2013-06-30 13:23 -0700
            Re: Simple Sort - the smallest sorting routine? "Alex McDonald" <blog@rivadpm.com> - 2013-06-30 21:48 +0100
              Re: Simple Sort - the smallest sorting routine? hughaguilar96@yahoo.com - 2013-06-30 16:53 -0700
                Re: Simple Sort - the smallest sorting routine? Alex McDonald <blog@rivadpm.com> - 2013-07-01 04:34 -0700
                Re: Simple Sort - the smallest sorting routine? hughaguilar96@yahoo.com - 2013-07-03 18:41 -0700
                Re: Simple Sort - the smallest sorting routine? Alex McDonald <blog@rivadpm.com> - 2013-07-04 02:58 -0700
                Re: Simple Sort - the smallest sorting routine? hughaguilar96@yahoo.com - 2013-07-04 21:30 -0700
                Re: Simple Sort - the smallest sorting routine? "Alex McDonald" <blog@rivadpm.com> - 2013-07-06 00:18 +0100
                Re: Simple Sort - the smallest sorting routine? Bernd Paysan <bernd.paysan@gmx.de> - 2013-07-06 13:45 +0200
                Re: Simple Sort - the smallest sorting routine? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-07-06 07:49 -0500
                Re: Simple Sort - the smallest sorting routine? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-07-06 13:38 +0000
                Re: Simple Sort - the smallest sorting routine? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-07-06 10:06 -0500
                Re: Simple Sort - the smallest sorting routine? hughaguilar96@yahoo.com - 2013-07-06 23:08 -0700
                Re: Simple Sort - the smallest sorting routine? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-07-07 06:24 -0500
                Re: Simple Sort - the smallest sorting routine? Bernd Paysan <bernd.paysan@gmx.de> - 2013-07-07 23:47 +0200
                Re: Simple Sort - the smallest sorting routine? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-07-07 09:59 +0000
                Re: Simple Sort - the smallest sorting routine? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-07-07 06:52 -0500
                Re: Simple Sort - the smallest sorting routine? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-07-07 12:18 +0000
                Re: Simple Sort - the smallest sorting routine? m.a.m.hendrix@tue.nl - 2013-07-08 00:06 -0700
                Re: Simple Sort - the smallest sorting routine? albert@spenarnc.xs4all.nl (Albert van der Horst) - 2013-07-08 09:50 +0000
                Re: Simple Sort - the smallest sorting routine? m.a.m.hendrix@tue.nl - 2013-07-08 03:14 -0700
                Re: Simple Sort - the smallest sorting routine? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-07-08 09:53 -0500
                Re: Simple Sort - the smallest sorting routine? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-07-09 14:25 +0000
                Re: Simple Sort - the smallest sorting routine? Bernd Paysan <bernd.paysan@gmx.de> - 2013-07-09 23:39 +0200
                Re: Simple Sort - the smallest sorting routine? Paul Rubin <no.email@nospam.invalid> - 2013-07-09 18:03 -0700
                Re: Simple Sort - the smallest sorting routine? Bernd Paysan <bernd.paysan@gmx.de> - 2013-07-10 23:05 +0200
                Re: Simple Sort - the smallest sorting routine? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-07-10 03:21 -0500
                Re: Simple Sort - the smallest sorting routine? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-07-10 10:29 +0000
                Re: Simple Sort - the smallest sorting routine? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-07-10 05:44 -0500
                Re: Simple Sort - the smallest sorting routine? Paul Rubin <no.email@nospam.invalid> - 2013-07-10 04:07 -0700
                Re: Simple Sort - the smallest sorting routine? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-07-10 06:06 -0500
                Re: Simple Sort - the smallest sorting routine? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-07-10 14:21 +0000
                Re: Simple Sort - the smallest sorting routine? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-07-10 04:45 -0500
                Re: Simple Sort - the smallest sorting routine? Paul Rubin <no.email@nospam.invalid> - 2013-07-10 03:13 -0700
                Re: Simple Sort - the smallest sorting routine? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-07-10 05:09 -0500
                Re: Simple Sort - the smallest sorting routine? albert@spenarnc.xs4all.nl (Albert van der Horst) - 2013-07-10 12:16 +0000
                Re: Simple Sort - the smallest sorting routine? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-07-10 10:38 +0000
                Re: Simple Sort - the smallest sorting routine? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-07-10 06:45 -0500
                Re: Simple Sort - the smallest sorting routine? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-07-10 13:56 +0000
                Re: Simple Sort - the smallest sorting routine? hughaguilar96@yahoo.com - 2013-07-10 10:54 -0700
                Re: Simple Sort - the smallest sorting routine? Alex McDonald <blog@rivadpm.com> - 2013-07-10 13:57 -0700
                Re: Simple Sort - the smallest sorting routine? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-07-10 07:15 -0500
                Re: Simple Sort - the smallest sorting routine? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-07-10 13:52 +0000
                Re: Simple Sort - the smallest sorting routine? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-07-10 15:00 -0500
                Re: Simple Sort - the smallest sorting routine? Coos Haak <chforth@hccnet.nl> - 2013-07-10 16:13 +0200
                Re: Simple Sort - the smallest sorting routine? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-07-10 17:07 -0500
                Re: Simple Sort - the smallest sorting routine? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-07-11 10:53 +0000
                Re: Simple Sort - the smallest sorting routine? hughaguilar96@yahoo.com - 2013-07-11 10:40 -0700
                Re: Simple Sort - the smallest sorting routine? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-07-11 15:17 -0500
                Re: Simple Sort - the smallest sorting routine? hughaguilar96@yahoo.com - 2013-07-11 16:54 -0700
                Re: Simple Sort - the smallest sorting routine? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-07-12 03:07 -0500
                Re: Simple Sort - the smallest sorting routine? Bernd Paysan <bernd.paysan@gmx.de> - 2013-07-07 00:43 +0200
                Re: Simple Sort - the smallest sorting routine? albert@spenarnc.xs4all.nl (Albert van der Horst) - 2013-07-07 00:21 +0000
                Re: Simple Sort - the smallest sorting routine? hughaguilar96@yahoo.com - 2013-07-06 20:32 -0700
                Re: Simple Sort - the smallest sorting routine? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-07-07 06:38 -0500
                Re: Simple Sort - the smallest sorting routine? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-07-07 07:05 -0500
                Re: Simple Sort - the smallest sorting routine? albert@spenarnc.xs4all.nl (Albert van der Horst) - 2013-07-07 13:00 +0000
                Re: Simple Sort - the smallest sorting routine? hughaguilar96@yahoo.com - 2013-07-07 09:47 -0700
                Re: Simple Sort - the smallest sorting routine? "Alex McDonald" <blog@rivadpm.com> - 2013-07-07 21:22 +0100
                Re: Simple Sort - the smallest sorting routine? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-07-07 19:25 -0500
                Re: Simple Sort - the smallest sorting routine? hughaguilar96@yahoo.com - 2013-07-07 21:58 -0700
                Re: Simple Sort - the smallest sorting routine? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-07-08 02:27 -0500
                Re: Simple Sort - the smallest sorting routine? hughaguilar96@yahoo.com - 2013-07-08 21:18 -0700
                Re: Simple Sort - the smallest sorting routine? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-07-09 04:20 -0500
                Re: Simple Sort - the smallest sorting routine? hughaguilar96@yahoo.com - 2013-07-10 10:30 -0700
                Re: Simple Sort - the smallest sorting routine? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-07-10 15:13 -0500
                Re: Simple Sort - the smallest sorting routine? hughaguilar96@yahoo.com - 2013-07-10 13:57 -0700
                Re: Simple Sort - the smallest sorting routine? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-07-10 16:57 -0500
                Re: Simple Sort - the smallest sorting routine? Elizabeth D Rather <erather@forth.com> - 2013-07-10 13:00 -1000
                Re: Simple Sort - the smallest sorting routine? hughaguilar96@yahoo.com - 2013-07-10 22:19 -0700
                Re: Simple Sort - the smallest sorting routine? hughaguilar96@yahoo.com - 2013-07-11 10:23 -0700
                Re: Simple Sort - the smallest sorting routine? Bernd Paysan <bernd.paysan@gmx.de> - 2013-07-11 01:12 +0200
                Re: Simple Sort - the smallest sorting routine? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-07-11 00:33 -0500
                Re: Simple Sort - the smallest sorting routine? Bernd Paysan <bernd.paysan@gmx.de> - 2013-07-11 11:48 +0200
                Re: Simple Sort - the smallest sorting routine? Paul Rubin <no.email@nospam.invalid> - 2013-07-11 03:08 -0700
                Re: Simple Sort - the smallest sorting routine? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-07-11 05:00 -0500
                Re: Simple Sort - the smallest sorting routine? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-07-11 10:17 +0000
                Re: Simple Sort - the smallest sorting routine? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-07-11 06:53 -0500
                Re: Simple Sort - the smallest sorting routine? albert@spenarnc.xs4all.nl (Albert van der Horst) - 2013-07-11 15:21 +0000
                Re: Simple Sort - the smallest sorting routine? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-07-11 10:37 -0500
                Re: Simple Sort - the smallest sorting routine? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-07-11 17:07 +0000
                Re: Simple Sort - the smallest sorting routine? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-07-11 15:19 -0500
                Re: Simple Sort - the smallest sorting routine? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-07-11 17:33 +0000
                Re: Simple Sort - the smallest sorting routine? albert@spenarnc.xs4all.nl (Albert van der Horst) - 2013-07-11 18:18 +0000
                Re: Simple Sort - the smallest sorting routine? hughaguilar96@yahoo.com - 2013-07-11 16:46 -0700
                Re: Simple Sort - the smallest sorting routine? Alex McDonald <blog@rivadpm.com> - 2013-07-12 03:48 -0700
                Re: Simple Sort - the smallest sorting routine? hughaguilar96@yahoo.com - 2013-07-12 10:55 -0700
                Re: Simple Sort - the smallest sorting routine? albert@spenarnc.xs4all.nl (Albert van der Horst) - 2013-07-12 19:29 +0000
                Re: Simple Sort - the smallest sorting routine? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-07-15 09:50 +0000
                Re: Simple Sort - the smallest sorting routine? Alex McDonald <blog@rivadpm.com> - 2013-07-12 13:22 -0700
                Re: Simple Sort - the smallest sorting routine? hughaguilar96@yahoo.com - 2013-07-13 20:05 -0700
                Re: Simple Sort - the smallest sorting routine? albert@spenarnc.xs4all.nl (Albert van der Horst) - 2013-07-14 11:34 +0000
                Re: Simple Sort - the smallest sorting routine? Alex McDonald <blog@rivadpm.com> - 2013-07-14 09:18 -0700
                Re: Simple Sort - the smallest sorting routine? hughaguilar96@yahoo.com - 2013-07-14 16:05 -0700
                Re: Simple Sort - the smallest sorting routine? Ron Aaron <rambamist@gmail.com> - 2013-07-15 06:12 +0300
                Re: Simple Sort - the smallest sorting routine? hughaguilar96@yahoo.com - 2013-07-14 22:17 -0700
                Re: Simple Sort - the smallest sorting routine? Ron Aaron <rambamist@gmail.com> - 2013-07-15 11:44 +0300
                Re: Simple Sort - the smallest sorting routine? Alex McDonald <blog@rivadpm.com> - 2013-07-15 09:42 -0700
                Re: Simple Sort - the smallest sorting routine? hughaguilar96@yahoo.com - 2013-07-16 18:03 -0700
                Re: Simple Sort - the smallest sorting routine? Alex McDonald <blog@rivadpm.com> - 2013-07-17 00:54 -0700
                Re: Simple Sort - the smallest sorting routine? Howerd <howerdo@yahoo.co.uk> - 2013-07-14 10:09 -0700
                Re: Simple Sort - the smallest sorting routine? hughaguilar96@yahoo.com - 2013-07-14 15:35 -0700
                Re: Simple Sort - the smallest sorting routine? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-07-11 17:08 +0000
                Re: Simple Sort - the smallest sorting routine? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-07-11 15:30 -0500
                Re: Simple Sort - the smallest sorting routine? hughaguilar96@yahoo.com - 2013-07-11 09:34 -0700
                Re: Simple Sort - the smallest sorting routine? Michael Morris <morrimichael@gmail.com> - 2013-07-15 23:09 -0500
                Re: Simple Sort - the smallest sorting routine? hughaguilar96@yahoo.com - 2013-07-16 17:46 -0700
                Re: Simple Sort - the smallest sorting routine? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-07-17 03:14 -0500
                Re: Simple Sort - the smallest sorting routine? "Rod Pemberton" <do_not_have@notemailnotq.cpm> - 2013-07-17 21:47 -0400
                Re: Simple Sort - the smallest sorting routine? "Alex McDonald" <blog@rivadpm.com> - 2013-07-11 04:06 +0100
                Re: Simple Sort - the smallest sorting routine? hughaguilar96@yahoo.com - 2013-07-06 20:18 -0700
                Re: Simple Sort - the smallest sorting routine? "Alex McDonald" <blog@rivadpm.com> - 2013-07-07 16:48 +0100
                Re: Simple Sort - the smallest sorting routine? hughaguilar96@yahoo.com - 2013-07-07 09:13 -0700
                Re: Simple Sort - the smallest sorting routine? hughaguilar96@yahoo.com - 2013-07-07 09:13 -0700
                Re: Simple Sort - the smallest sorting routine? "Alex McDonald" <blog@rivadpm.com> - 2013-07-07 21:24 +0100
                Re: Simple Sort - the smallest sorting routine? albert@spenarnc.xs4all.nl (Albert van der Horst) - 2013-07-04 14:41 +0000
        Re: Simple Sort - the smallest sorting routine? Alex McDonald <blog@rivadpm.com> - 2013-06-27 01:59 -0700
          Re: Simple Sort - the smallest sorting routine? hughaguilar96@yahoo.com - 2013-06-30 09:30 -0700
            Re: Simple Sort - the smallest sorting routine? Alex McDonald <blog@rivadpm.com> - 2013-06-30 12:59 -0700
    Re: Simple Sort - the smallest sorting routine? awegel@arcor.de (Alex Wegel) - 2013-06-27 00:08 +0200
    Re: Simple Sort - the smallest sorting routine? Doug Hoffman <glidedog@gmail.com> - 2013-06-26 19:31 -0400
      Re: Simple Sort - the smallest sorting routine? Doug Hoffman <glidedog@gmail.com> - 2013-06-27 06:26 -0400
  Re: Simple Sort - the smallest sorting routine? albert@spenarnc.xs4all.nl (Albert van der Horst) - 2013-06-28 02:05 +0000
    Re: Simple Sort - the smallest sorting routine? Alex McDonald <blog@rivadpm.com> - 2013-07-04 07:33 -0700
      Re: Simple Sort - the smallest sorting routine? Coos Haak <chforth@hccnet.nl> - 2013-07-05 00:47 +0200
        Re: Simple Sort - the smallest sorting routine? albert@spenarnc.xs4all.nl (Albert van der Horst) - 2013-07-14 19:01 +0000
          Re: Simple Sort - the smallest sorting routine? albert@spenarnc.xs4all.nl (Albert van der Horst) - 2013-07-15 01:28 +0000
        Re: Simple Sort - the smallest sorting routine? Ian Osgood <iano@quirkster.com> - 2013-07-19 11:29 -0700
  Re: Simple Sort - the smallest sorting routine? Brad Eckert <hwfwguy@gmail.com> - 2013-07-19 09:09 -0700

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