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I think notes from 6.1.3.6 Float Functions about ceil and floor should be
replaced:
cail: ".. greater than .." => "... not less than ..."
floor: "... less than ..." => ".. not greater than .."
ABX
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From: Thorsten Froehlich
Subject: Re: not precise ceil and floor description
Date: 21 Sep 2002 13:48:59
Message: <3d8cb10b@news.povray.org>
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In article <2hhmouc2puaigl2f29e5tu01mddju0o3pf@4ax.com> , ABX
<abx### [at] abx artpl> wrote:
> I think notes from 6.1.3.6 Float Functions about ceil and floor should be
> replaced:
>
> cail: ".. greater than .." => "... not less than ..."
> floor: "... less than ..." => ".. not greater than .."
No, double negations and negations of comparisons are extremely bad.
Thorsten
____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde
Visit POV-Ray on the web: http://mac.povray.org
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On Sat, 21 Sep 2002 19:48:58 +0200, "Thorsten Froehlich" <tho### [at] trfde>
wrote:
> > cail: ".. greater than .." => "... not less than ..."
> > floor: "... less than ..." => ".. not greater than .."
>
> No, double negations and negations of comparisons are extremely bad.
We use double negations in polish so it can insfluence my report however I'm
confused. I can't find double negation in my replacement proposition and
before I send it I have checked many sites with C descriptions and mostly
found they use "not less"/"not greater" versions. Those C functions are
directly called in POV parser. Would you like to unroll your statement ?
ABX
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From: Thorsten Froehlich
Subject: Re: not precise ceil and floor description
Date: 23 Sep 2002 16:54:25
Message: <3d8f7f81$1@news.povray.org>
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In article <hibtoug7u3s1731hppu1l70c3bm3sa8og8@4ax.com> , ABX
<abx### [at] abxartpl> wrote:
>> No, double negations and negations of comparisons are extremely bad.
>
> We use double negations in polish so it can insfluence my report however I'm
> confused. I can't find double negation in my replacement proposition and
> before I send it I have checked many sites with C descriptions and mostly
> found they use "not less"/"not greater" versions. Those C functions are
> directly called in POV parser. Would you like to unroll your statement ?
It is meant general and specifically. The general part of the "double
negations" and the specific part is the "negations of comparisons". The
term "not less" means "greater or equal", and "not greater" means "less or
equal". Or in C terms "!(a < b)" is much better presented as "(a >= b)" ;-)
Thorsten
____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde
Visit POV-Ray on the web: http://mac.povray.org
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