From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Ann: Natools.Chunked_Strings, beta 1
Date: Fri, 2 Dec 2011 14:11:19 +0100
Date: 2011-12-02T14:11:19+01:00 [thread overview]
Message-ID: <1p2as5zhorw26.1lj8cjmzr1to0$.dlg@40tude.net> (raw)
In-Reply-To: 4ed89aa8$0$7616$9b4e6d93@newsspool1.arcor-online.net
On Fri, 02 Dec 2011 10:30:11 +0100, Georg Bauhaus wrote:
> On 02.12.11 09:27, Dmitry A. Kazakov wrote:
>> DNA chain is not a text string. Furthermore it would likely have some
>> specific operations and a representation tailored substring search.
>
> I have tried this once. Sequence information is given and is using just
> a handful of characters. I mapped those to some 4bit type, even tried less.
> Added lots of purportedly smart unchecked conversions, some shifting,
> made my head spin by thinking about what combinations of "characters"
> might suggest there could be clever additions, not shifts and the like
> for obtaining info about substrings or single "characters", noted that
> addition is faster than shifting or logical operations on the processor,
> etc. Tried specializing searching. If there is a solution, it seems tricky.
> Perhaps to be found by someone with more than ordinary combinatorial skills.
> In my case this effort has produced only minuscule advantages, sometimes
> the opposite, but the cost was a large number of specialized subprograms.
There is a simple way to do such things efficiently, You tabulate
operations you want. It is just 2**16 combinations for a dyadic operation
taking two arguments of 2**8 states. A 64K array is nothing in these times.
The array can be initialized by an aggregate which text is generated once.
I am using such techniques from time to time, e.g. for character conversion
maps, for small images (icons etc) embedded into the application, etc.
--
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de
next prev parent reply other threads:[~2011-12-02 13:12 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-29 15:16 Ann: Natools.Chunked_Strings, beta 1 Natasha Kerensikova
2011-11-29 15:37 ` Pascal Obry
2011-11-29 16:34 ` Natasha Kerensikova
2011-11-29 17:08 ` Georg Bauhaus
2011-11-30 9:51 ` Natasha Kerensikova
2011-11-29 20:25 ` Randy Brukardt
2011-11-30 10:44 ` Yannick Duchêne (Hibou57)
2011-11-30 10:39 ` Yannick Duchêne (Hibou57)
2011-11-30 10:57 ` Dmitry A. Kazakov
2011-12-01 0:11 ` Randy Brukardt
2011-12-01 8:30 ` Dmitry A. Kazakov
2011-12-01 23:26 ` Vinzent Hoefler
2011-12-02 8:27 ` Dmitry A. Kazakov
2011-12-02 9:30 ` Georg Bauhaus
2011-12-02 13:11 ` Dmitry A. Kazakov [this message]
2011-12-02 0:39 ` Randy Brukardt
2011-12-01 9:02 ` Yannick Duchêne (Hibou57)
2011-11-30 13:08 ` Natasha Kerensikova
2011-11-30 19:39 ` Jeffrey Carter
2011-12-01 10:57 ` Natasha Kerensikova
2011-12-01 19:07 ` Jeffrey Carter
2011-12-01 21:19 ` Yannick Duchêne (Hibou57)
2011-12-01 22:49 ` Natasha Kerensikova
2011-12-02 16:16 ` Tero Koskinen
2011-12-02 17:36 ` Adam Beneschan
2011-12-02 18:52 ` Tero Koskinen
2011-12-02 18:14 ` Yannick Duchêne (Hibou57)
2011-12-02 19:07 ` Adam Beneschan
2011-11-30 10:33 ` Yannick Duchêne (Hibou57)
2011-11-30 11:04 ` Natasha Kerensikova
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