Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!us.feeder.erje.net!news2.arglkargh.de!newsfeed.fsmpi.rwth-aachen.de!eternal-september.org!feeder.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: Martin Gregorie <martin@address-in-sig.invalid>
Newsgroups: comp.lang.java.programmer
Subject: Re: Autoboxing and Performance ?
Date: Fri, 23 Aug 2013 23:16:04 +0000 (UTC)
Organization: A noiseless patient Spider
Lines: 26
Message-ID: <kv8qfj$1co$1@dont-email.me>
References: <fcudnTCLD6xZ3I7PnZ2dnUVZ_gadnZ2d@giganews.com> <wbsfj3kz9x6.1hthr4dxr2yvl$.dlg@40tude.net> <cLydnRPXuKJn2I7PnZ2dnUVZ_jydnZ2d@giganews.com> <b7ih9oF5l3bU1@mid.dfncis.de> <kv1j3p$h2v$1@news.albasani.net> <b7lk0hFpbj9U1@mid.dfncis.de> <5csRt.197906$jW3.50636@fx23.iad> <kv5p7j$30v$1@dont-email.me> <units-20130822220059@ram.dialup.fu-berlin.de> <kv5v87$1og$1@dont-email.me> <kyvRt.176811$Z84.113359@fx29.iad> <distance-20130822234736@ram.dialup.fu-berlin.de> <kv6il1$4a1$1@dont-email.me> <symbolic-calculations-20130823063501@ram.dialup.fu-berlin.de>
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Injection-Date: Fri, 23 Aug 2013 23:16:04 +0000 (UTC)
Injection-Info: mx05.eternal-september.org; posting-host="e5160e2be48f1ea550cf61512446f525"; logging-data="1432"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX1/5HSVUGHvswdP9hEDR69l+cxOGbBbV5PA="
User-Agent: Pan/0.139 (Sexual Chocolate; GIT bf56508 git://git.gnome.org/pan2)
Cancel-Lock: sha1:tBHQJlpzgQuty0yOAyg9Bte5vYo=
Xref: csiph.com comp.lang.java.programmer:25129

On Fri, 23 Aug 2013 04:41:45 +0000, Stefan Ram wrote:

> markspace <markspace@nospam.nospam> writes:
>>Hmm, ok.  Symbolic means speed = distance / time.  No units involved
>>there.
> 
>   For example, when an object initially rests at height h,
>   we want to known its terminal speed v upon impact.
>   The potential energy is mgh, so mgh=½mv², thus v = sqrt(2gh).
>   Thus, we have symbolically calculated the impact speed v.
> 
>   Computer Software also can do such calculations after it has learned
>   the assertions to start from, such as mgh=½mv², and been told to which
>   variable to solve this for. The symbolic result of the software will
>   be: »v=sqrt(2gh)«.
>
In my book that's algebraic manipulation, i.e. mathematics, not physics. 
Physics purports to describe the real world and hence any measurement 
must specify the units, while algebra is dimensionless.



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