[25307] in Perl-Users-Digest
Perl-Users Digest, Issue: 7552 Volume: 10
daemon@ATHENA.MIT.EDU (Perl-Users Digest)
Wed Dec 22 11:11:05 2004
Date: Wed, 22 Dec 2004 08:10:14 -0800 (PST)
From: Perl-Users Digest <Perl-Users-Request@ruby.OCE.ORST.EDU>
To: Perl-Users@ruby.OCE.ORST.EDU (Perl-Users Digest)
Perl-Users Digest Wed, 22 Dec 2004 Volume: 10 Number: 7552
Today's topics:
Re: Is zero even or odd? <bik.mido@tiscalinet.it>
Re: Is zero even or odd? <invalid@msgid.michael.mendelsohn.de>
Re: Is zero even or odd? <yd.techHAT@techie.com>
Re: Is zero even or odd? <dak@gnu.org>
Re: Is zero even or odd? <shawn.corey@sympatico.ca>
Re: Is zero even or odd? <chichess@beforeRCNafter.com>
Re: Is zero even or odd? <hadrainc@earthlink.net>
Re: Is zero even or odd? <hadrainc@earthlink.net>
Re: Is zero even or odd? <hadrainc@earthlink.net>
Re: Is zero even or odd? <hadrainc@earthlink.net>
Re: Is zero even or odd? <hadrainc@earthlink.net>
Re: Is zero even or odd? <hadrainc@earthlink.net>
Re: Is zero even or odd? <hadrainc@earthlink.net>
Re: Is zero even or odd? <hadrainc@earthlink.net>
Re: Is zero even or odd? <hadrainc@earthlink.net>
Re: Is zero even or odd? <hadrainc@earthlink.net>
Re: Is zero even or odd? <hadrainc@earthlink.net>
Re: Is zero even or odd? <hadrainc@earthlink.net>
Re: Is zero even or odd? <spikeywan@bigfoot.com>
Re: Is zero even or odd? <hadrainc@earthlink.net>
Re: Is zero even or odd? <hadrainc@earthlink.net>
Re: Is zero even or odd? <hadrainc@earthlink.net>
Re: Is zero even or odd? <jmw@jmwa.demon.contraspam.yuk>
Re: Is zero even or odd? <see@sig.com>
Re: Is zero even or odd? <nowhere@nowhere.net>
Re: Is zero even or odd? <dak@gnu.org>
Re: Is zero even or odd? <salesEXTRACT@anasoft.co.uk>
Re: Is zero even or odd? <salesEXTRACT@anasoft.co.uk>
Re: Is zero even or odd? <do-not-use@invalid.net>
need help in programming linux with perl <lie_huo@hotmail.com>
Re: need help in programming linux with perl <no@email.com>
newbie question...can't die..whod a thunk it? <bbeaman2@cox.net>
Re: newbie question...can't die..whod a thunk it? (Anno Siegel)
Re: newbie question...can't die..whod a thunk it? <zen13097@zen.co.uk>
Re: newbie question...can't die..whod a thunk it? <noreply@gunnar.cc>
Re: Newbie question <x3v0-usenet@yahoo.com>
Re: selecting STDOUT AND STDERR <bill@gites.org.uk>
Digest Administrivia (Last modified: 6 Apr 01) (Perl-Users-Digest Admin)
----------------------------------------------------------------------
Date: Wed, 22 Dec 2004 08:33:26 +0100
From: Michele Dondi <bik.mido@tiscalinet.it>
Subject: Re: Is zero even or odd?
Message-Id: <kj8sru8s9ogmqfkp28m9f81d913hm1hb3u@4ax.com>
On Mon, 20 Dec 2004 14:21:11 -0000, Gactimus <gactimus@xrs.net> wrote:
>Subject: Is zero even or odd?
Yes it is!
Michele
--
{$_=pack'B8'x25,unpack'A8'x32,$a^=sub{pop^pop}->(map substr
(($a||=join'',map--$|x$_,(unpack'w',unpack'u','G^<R<Y]*YB='
.'KYU;*EVH[.FHF2W+#"\Z*5TI/ER<Z`S(G.DZZ9OX0Z')=~/./g)x2,$_,
256),7,249);s/[^\w,]/ /g;$ \=/^J/?$/:"\r";print,redo}#JAPH,
------------------------------
Date: Wed, 22 Dec 2004 09:23:58 +0100
From: Michael Mendelsohn <invalid@msgid.michael.mendelsohn.de>
Subject: Re: Is zero even or odd?
Message-Id: <41C92F1E.4146E7FD@msgid.michael.mendelsohn.de>
John Woodgate schrieb:
> I read in sci.electronics.design that Nicholas O. Lindan <see@sig.com>
>
> >Slightly OT, is there an accepted ASCII-gram for square root?
>
> I've seen v/(x) used; it's fairly evident what it means. I just found
> that decimal 175 is an 'overscore' character, ¯, which means that v/¯(x)
> could be used.
I suggest
²v¯(a+b) = v¯(a+b) = (a+b)^(1/2) = (a+b)^½ = sqrt(a+b)
³v¯(a+b) = (a+b)^(1/3)
The ASCII-grams have the worst readability of the bunch, IMO.
Cheers
Michael
--
Still an attentive ear he lent Her speech hath caused this pain
But could not fathom what she meant Easier I count it to explain
She was not deep, nor eloquent. The jargon of the howling main
-- from Lewis Carroll: The Three Usenet Trolls
------------------------------
Date: Wed, 22 Dec 2004 07:26:13 -0300
From: YD <yd.techHAT@techie.com>
Subject: Re: Is zero even or odd?
Message-Id: <koiis0dkltn2j65kscolct561m971edl5f@4ax.com>
On Wed, 22 Dec 2004 04:09:21 +0000, John Woodgate
<jmw@jmwa.demon.contraspam.yuk> wrote:
>I read in sci.electronics.design that Nicholas O. Lindan <see@sig.com>
>wrote (in <zv4yd.7675$Z47.4756@newsread2.news.atl.earthlink.net>) about
>'Is zero even or odd?', on Wed, 22 Dec 2004:
>
>>Slightly OT, is there an accepted ASCII-gram for square root?
>
>I've seen v/(x) used; it's fairly evident what it means. I just found
>that decimal 175 is an 'overscore' character, ¯, which means that v/¯(x)
>could be used.
Not all newsreaders or fontsets may be able to render that correctly.
Though I doubt anyone is still using 7-bit ASCII.
>
>How about) for cube root?
There, you see? It became a ) for me.
- YD.
--
Remove HAT if replying by mail.
------------------------------
Date: Wed, 22 Dec 2004 11:11:19 +0100
From: David Kastrup <dak@gnu.org>
Subject: Re: Is zero even or odd?
Message-Id: <x5zn064p88.fsf@lola.goethe.zz>
Willem <willem@stack.nl> writes:
> ) "Franz Heymann" <notfranz.heymann@btopenworld.com> wrote in message
> ) news:cqab4k$7m1$6@sparta.btinternet.com...
> ) <snip>
> )> If you knew any maths worth talking about, you would have known that
> )> sin(0) / 0 is not the same as the limit of sin(x) / x as x tends to 0.
> )> The first is undefined and the second is unity.
>
> Tam/WB2TT wrote:
>
> ) Tell that to all the book publishers who print curves for sinx/x.
>
> If you zoom in on those printed curves far enough, you'll notice
> that there is no ink at the actual point (0,1).
Exactly at 0 (and nowhere else), there is a vertical smear from
roadkill. If you ever wondered where Schrödinger's cat ended up after
all, this is it.
--
David Kastrup, Kriemhildstr. 15, 44793 Bochum
------------------------------
Date: Wed, 22 Dec 2004 07:18:34 -0500
From: Shawn Corey <shawn.corey@sympatico.ca>
Subject: Re: Is zero even or odd?
Message-Id: <wBdyd.10298$Z%3.634233@news20.bellglobal.com>
Richard S Beckett wrote:
>>>Nicholas O. Lindan wrote:
>>>
>>>>1 + 1 = 0/0 + 0/0 = (0 + 0)/0 = 2 * 0/0 = 2
>>>>
>>>
>>> a = b
>>> a^2 = ab
>>> a^2 - b^2 = ab - b^2
>>>(a+b)(a-b) = b(a-b)
>
>
> When you attempt to divide by zero, you get...
>
>
>>> a+b = b
>
>
> Division by zero error!
>
>
>>>but a = b
>>> a+a = a
>>> 2a = a
You missed one. The above implies a=0 therefore the next statement also
divides by zero.
>>> 2 = 1
>>>
>>>What could be clearer?
>
>
> Erm, dunno. Glass?
>
>
Don't you know sarcasm when you hear it?
--- Shawn
------------------------------
Date: Wed, 22 Dec 2004 07:23:14 -0600
From: "Bill Smythe" <chichess@beforeRCNafter.com>
Subject: Re: Is zero even or odd?
Message-Id: <kcCdnSQbjJQq6lTcRVn-jg@rcn.net>
"Gactimus" wrote:
> I know 0 is neither negative or positive but what about odd/even? I think
> it's even.
Of course it is. There exists a whole number X such that X*2=0. Thus, 0 is
even.
Bill Smythe
------------------------------
Date: Wed, 22 Dec 2004 13:56:07 GMT
From: vonroach <hadrainc@earthlink.net>
Subject: Re: Is zero even or odd?
Message-Id: <7luis0ptcsi8cbs3k5qjqpj3h106k6calt@4ax.com>
On Mon, 20 Dec 2004 15:24:39 +0100, Josef Moellers
<josef.moellers@fujitsu-siemens.com> wrote:
>Gactimus wrote:
>> I know 0 is neither negative or positive but what about odd/even? I think
>> it's even.
>>
>> Odd numbers start at 1 and go every other number 1,3,5,7;1,-1,-3,-5,-7
>> Even starts at 2 and go every other number 2,4,6,8;2,0,-2,-4,-6,-8
>
>As it can be divided by 2 without a remainder, it is obviously even.
Er..., it can also be divided by every other number (rational,
irrational, and imaginary) without a remainder, although some of us
are amused by the strange concept of dividing nothing and the absurd
idea that there may be a `remainder'. Then comes the wild assertion
that when a number is divided by nothing, it becomes infinite.
------------------------------
Date: Wed, 22 Dec 2004 14:04:15 GMT
From: vonroach <hadrainc@earthlink.net>
Subject: Re: Is zero even or odd?
Message-Id: <79vis01cj5jgfkdmsf49nbctor722kk1r8@4ax.com>
On Mon, 20 Dec 2004 14:34:03 -0000, BB <BB@BB.BB> wrote:
>The divisor would have to be something smaller than 0 like -2.
>Therefore zero is both even and negative.
Whoa! A new concept: -0. Let's make up some other numbers. I suggest
wizzad and fugawe. I'd have suggested Arunda, but I believe some
obscure African group already uses that in their alphabet.
------------------------------
Date: Wed, 22 Dec 2004 14:08:44 GMT
From: vonroach <hadrainc@earthlink.net>
Subject: Re: Is zero even or odd?
Message-Id: <rmvis0tbevrfksf89mu5ef73s9cc79cgdj@4ax.com>
On 20 Dec 2004 07:02:45 -0800, merlyn@stonehenge.com (Randal L.
Schwartz) wrote:
>This is a troll. *Negative*? Can I have some of the drug you're
>smoking? :)
That's no good Randy, no matter how much you buy, you still have
nothing. Coincidentally with constant use the measurable IQ approaches
zero as a limit.
------------------------------
Date: Wed, 22 Dec 2004 14:12:02 GMT
From: vonroach <hadrainc@earthlink.net>
Subject: Re: Is zero even or odd?
Message-Id: <iuvis019i9afhth7ui8gojpscfrnfgrciu@4ax.com>
On Mon, 20 Dec 2004 09:21:25 -0600, John Sefton <john@petcom.com>
wrote:
>Randal L. Schwartz wrote:
>>>>>>>"BB" == BB <BB@BB.BB> writes:
>>>>>>
>>
>> BB> The divisor would have to be something smaller than 0 like -2.
>> BB> Therefore zero is both even and negative.
>>
>> This is a troll. *Negative*? Can I have some of the drug you're
>> smoking? :)
>>
>
>It's not a prime, because a prime can
>only be divided by itself and 1.
>0 can't be divided by itself, but
>can be divided by everything else.
>An anti-prime?
>John
Perhaps a superprime. `antiprime' is as mysterious as - 0.
------------------------------
Date: Wed, 22 Dec 2004 14:19:44 GMT
From: vonroach <hadrainc@earthlink.net>
Subject: Re: Is zero even or odd?
Message-Id: <h60js0haedvtl6nnmf0rqdj0h2ol36bgh6@4ax.com>
On Mon, 20 Dec 2004 15:36:15 GMT, "Nicholas O. Lindan" <see@sig.com>
wrote:
>"John Sefton" <john@petcom.com> wrote
>
>> 0 can't be divided by itself,
>
>Sure it can: 0 / 0 = 0 * (1 / 0) = 0 * infinity = 1
>
>It works if the only three numbers in the universe are
>0, 1, and infinity -- A number system that seems very
>suited to usenet.
Add to that the troubling thought that 1/0, 1/1, 0/1, and 0/0 are all
rational numbers. If 1/0 = `infinity' how do we decide if there is any
remainder? Looks like there should be a remainder of 1. If that is so,
how do we know it has really been divided by 0?
------------------------------
Date: Wed, 22 Dec 2004 14:24:59 GMT
From: vonroach <hadrainc@earthlink.net>
Subject: Re: Is zero even or odd?
Message-Id: <7s0js0tu6h6o9o7gibltfkucgj375gkmai@4ax.com>
On Mon, 20 Dec 2004 22:19:46 +0000 (UTC), "Franz Heymann"
<notfranz.heymann@btopenworld.com> wrote:
>There is no lack of rigour in the definition of infinity. Read anbout
>the work of Cantor, Dedekind and others.
Do you have similar `readings' covering 0?
------------------------------
Date: Wed, 22 Dec 2004 14:27:48 GMT
From: vonroach <hadrainc@earthlink.net>
Subject: Re: Is zero even or odd?
Message-Id: <rv0js09fv412de0e0ev8gnqidesff70ndt@4ax.com>
On Mon, 20 Dec 2004 15:43:59 -0500, Shawn Corey
<shawn.corey@sympatico.ca> wrote:
>Nicholas O. Lindan wrote:
>> "John Sefton" <john@petcom.com> wrote
>>
>>
>>>0 can't be divided by itself,
>>
>>
>> Sure it can: 0 / 0 = 0 * (1 / 0) = 0 * infinity = 1
>>
>> It works if the only three numbers in the universe are
>> 0, 1, and infinity -- A number system that seems very
>> suited to usenet.
>>
>
>Zero is even. You cannot divide by zero. Limits are not division.
>Infinity is not a number. Computers bugger up the system.
>
> --- Shawn
Shawn, I am equally convinced that it is neither even or odd. Though I
will admit that those who need to decide are rather odd.
------------------------------
Date: Wed, 22 Dec 2004 14:33:47 GMT
From: vonroach <hadrainc@earthlink.net>
Subject: Re: Is zero even or odd?
Message-Id: <n61js0tmffd8pdsbk0uvg6qj6r6hpf768m@4ax.com>
On Mon, 20 Dec 2004 15:21:14 -0800, "Alfred Z. Newmane"
<a.newmane.remove@eastcoastcz.com> wrote:
>Except for the fact that: 0 / 0 = undefined
>
>Or actually more correct: n / 0 = undefined
Really, Al Z? Where did you get that doctorate in math? Various
middle eastern types have worked hard to see that was not the case.
------------------------------
Date: Wed, 22 Dec 2004 14:35:54 GMT
From: vonroach <hadrainc@earthlink.net>
Subject: Re: Is zero even or odd?
Message-Id: <6g1js0hq28c3e8voli8jt7nh161gf7520j@4ax.com>
On Tue, 21 Dec 2004 01:08:55 GMT, Fred Bloggs <nospam@nospam.com>
wrote:
>
>
>Alfred Z. Newmane wrote:
>> Nicholas O. Lindan wrote:
>>
>>>"John Sefton" <john@petcom.com> wrote
>>>
>>>
>>>>0 can't be divided by itself,
>>>
>>>Sure it can: 0 / 0 = 0 * (1 / 0) = 0 * infinity = 1
>>>
>>>It works if the only three numbers in the universe are
>>>0, 1, and infinity -- A number system that seems very
>>>suited to usenet.
>>
>>
>> Except for the fact that: 0 / 0 = undefined
>>
>> Or actually more correct: n / 0 = undefined
>>
>>
>
>0/0={ SET OF ALL INTEGERS }
>
>n/0= NULL SET for n<>0
Why drag n <>0 into an otherwise friendly discussion.
>It is very well-defined.
------------------------------
Date: Wed, 22 Dec 2004 14:38:20 GMT
From: vonroach <hadrainc@earthlink.net>
Subject: Re: Is zero even or odd?
Message-Id: <bk1js0pbesrhte5jbkri8n3fq98s244it7@4ax.com>
On Tue, 21 Dec 2004 07:08:11 GMT, "Kevin Aylward"
<salesEXTRACT@anasoft.co.uk> wrote:
>Fred Bloggs wrote:
>> Alfred Z. Newmane wrote:
>>> Nicholas O. Lindan wrote:
>>>
>>>> "John Sefton" <john@petcom.com> wrote
>>>>
>>>>
>>>>> 0 can't be divided by itself,
>>>>
>>>> Sure it can: 0 / 0 = 0 * (1 / 0) = 0 * infinity = 1
>>>>
>>>> It works if the only three numbers in the universe are
>>>> 0, 1, and infinity -- A number system that seems very
>>>> suited to usenet.
>>>
>>>
>>> Except for the fact that: 0 / 0 = undefined
>>>
>>> Or actually more correct: n / 0 = undefined
>>>
>>>
>>
>> 0/0={ SET OF ALL INTEGERS }
>
>No.
>
>>
>> n/0= NULL SET for n<>0
>>
>> It is very well-defined.
>
>No it isnt.
>
>Kevin Aylward
Now that you are in to definitions, what does `Aylward' mean?
------------------------------
Date: Wed, 22 Dec 2004 14:43:11 GMT
From: vonroach <hadrainc@earthlink.net>
Subject: Re: Is zero even or odd?
Message-Id: <op1js0lul6ccphgi4fe5ubavrd07g0qqhd@4ax.com>
On Tue, 21 Dec 2004 10:37:35 GMT, Fred Bloggs <nospam@nospam.com>
wrote:
>
>
>Kevin Aylward wrote:
>> Fred Bloggs wrote:
>>
>>>Alfred Z. Newmane wrote:
>>>
>>>>Nicholas O. Lindan wrote:
>>>>
>>>>
>>>>>"John Sefton" <john@petcom.com> wrote
>>>>>
>>>>>
>>>>>
>>>>>>0 can't be divided by itself,
>>>>>
>>>>>Sure it can: 0 / 0 = 0 * (1 / 0) = 0 * infinity = 1
>>>>>
>>>>>It works if the only three numbers in the universe are
>>>>>0, 1, and infinity -- A number system that seems very
>>>>>suited to usenet.
>>>>
>>>>
>>>>Except for the fact that: 0 / 0 = undefined
>>>>
>>>>Or actually more correct: n / 0 = undefined
>>>>
>>>>
>>>
>>>0/0={ SET OF ALL INTEGERS }
>>
>>
>> No.
>>
>>
>>>n/0= NULL SET for n<>0
>>>
>>>It is very well-defined.
>>
>>
>> No it isnt.
>>
>> Kevin Aylward
>
>You apparently have stumbled on something else you know damn little
>about. In case you need help with this , you might note that "/" is NOT
>an operator on the integers, it is the "inverse" of a multiplication
>operator. Inverse is a well-defined concept but not necessarily a
>function, it is a set theoretic mapping. E.G. m/n={ q: m=q*n} by
>definition, so that m/n which is actually a set which can be empty, a
>singleton, or infinite. In the case of m/n, it is then m/n = F^-1(m)
>where F(x)= n*x. Your reasoning would lead one to believe /: I x I -> I
>is a function, which it isn't.
Ah, the inverse , like 1/0 is inverse of 0/1? Is 0/0 the inverse of
0/0? And 1/1, the inverse of 1/1.
------------------------------
Date: Wed, 22 Dec 2004 14:46:31 GMT
From: vonroach <hadrainc@earthlink.net>
Subject: Re: Is zero even or odd?
Message-Id: <642js0529adl4s0cmpr1c69emvun2beboq@4ax.com>
On Tue, 21 Dec 2004 11:04:59 GMT, "Kevin Aylward"
<salesEXTRACT@anasoft.co.uk> wrote:
>Sure, you can have *another* meaning to the / operator in a different
>context, but this aint that context. This discussion is about a/b as
>usually understood in arithmetic.
a/b ? Now your getting into complicated stuff.
------------------------------
Date: Wed, 22 Dec 2004 14:14:13 -0000
From: "Richard S Beckett" <spikeywan@bigfoot.com>
Subject: Re: Is zero even or odd?
Message-Id: <cqbvl9$o9n$1@newshost.mot.com>
"Shawn Corey" <shawn.corey@sympatico.ca> wrote
> >>>What could be clearer?
> > Erm, dunno. Glass?
> Don't you know sarcasm when you hear it?
Nope! ;-)
------------------------------
Date: Wed, 22 Dec 2004 14:49:45 GMT
From: vonroach <hadrainc@earthlink.net>
Subject: Re: Is zero even or odd?
Message-Id: <fa2js0pd4v6o2cp1c1j8kkn0vubhgaf7lu@4ax.com>
On Tue, 21 Dec 2004 10:39:22 -0500, "Richards Noah \(IFR LIT MET\)"
<Noah.Richards@infineon.com> wrote:
>You guys are arguing two different things. The argument that 0/0 is the set
>of all integers/reals/whatever you are using is the set theory response to
>the question. However, the more commonly used form is the algebraicly
>accepted argument that states that division is a function of the forms: Z /
>Z -> Q, R / R -> R, etc. In this definition, division by 0 is undefined for
>all Z or R, including 0. So, you are both correct, but arguing different
>things.
Then infinity is undefined?
------------------------------
Date: Wed, 22 Dec 2004 14:54:12 GMT
From: vonroach <hadrainc@earthlink.net>
Subject: Re: Is zero even or odd?
Message-Id: <af2js0hj8fs5cjvah4cvljr2qb4q5otnup@4ax.com>
On Tue, 21 Dec 2004 10:40:32 GMT, Fred Bloggs <nospam@nospam.com>
wrote:
>Wrong- where do you get off saying (2*0)/0= 2*(0/0) ?
(2 x0)/0 = 2x(0/0) . there now is that better?
------------------------------
Date: Wed, 22 Dec 2004 14:58:35 GMT
From: vonroach <hadrainc@earthlink.net>
Subject: Re: Is zero even or odd?
Message-Id: <ro2js0tcpbq8t2nrevsqu0patpenhcb549@4ax.com>
On Wed, 22 Dec 2004 01:56:47 GMT, "Nicholas O. Lindan" <see@sig.com>
wrote:
>If I treat 0 as an imaginary number
Now you say 0= -1^1/2? You are using your imagination.
------------------------------
Date: Wed, 22 Dec 2004 14:59:18 +0000
From: John Woodgate <jmw@jmwa.demon.contraspam.yuk>
Subject: Re: Is zero even or odd?
Message-Id: <WrWgc+HGvYyBFwOH@jmwa.demon.co.uk>
I read in sci.electronics.design that Franz Heymann <notfranz.heymann@bt
openworld.com> wrote (in <cq7j61$6gm$2@sparta.btinternet.com>) about 'Is
zero even or odd?', on Mon, 20 Dec 2004:
>There is no lack of rigour in the definition of infinity. Read anbout
>the work of Cantor, Dedekind and others.
Indeed: I was referring to the lack of rigour in '1/0 = infinity'.
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
------------------------------
Date: Wed, 22 Dec 2004 15:17:40 GMT
From: "Nicholas O. Lindan" <see@sig.com>
Subject: Re: Is zero even or odd?
Message-Id: <oegyd.8897$yK.550@newsread3.news.atl.earthlink.net>
"vonroach" <hadrainc@earthlink.net> wrote
> On Wed, 22 Dec 2004 01:56:47 GMT, "Nicholas O. Lindan" <see@sig.com>
> >If I treat 0 as an imaginary number
> Now you say 0= -1^1/2? You are using your imagination.
No, I think you are the first to say that, at least in this thread.
There are more imaginary numbers in the usenet than are counted
in your philosophy.
--
Nicholas O. Lindan, Cleveland, Ohio
Consulting Engineer: Electronics; Informatics; Photonics.
Remove spaces etc. to reply: n o lindan at net com dot com
psst.. want to buy an f-stop timer? nolindan.com/da/fstop/
------------------------------
Date: Wed, 22 Dec 2004 10:32:46 -0500
From: "robert j. kolker" <nowhere@nowhere.net>
Subject: Re: Is zero even or odd?
Message-Id: <32tid2F3n5bihU1@individual.net>
vonroach wrote:
> Er..., it can also be divided by every other number (rational,
> irrational, and imaginary) without a remainder,
irrelevent. The -definition- of an even integer is an integer equivalent
to zero mod 2. Given any integer k != 0 we can always find an even
multiple of k. We can also find an odd multiple of k.
Bob Kolker
------------------------------
Date: Wed, 22 Dec 2004 16:44:43 +0100
From: David Kastrup <dak@gnu.org>
Subject: Re: Is zero even or odd?
Message-Id: <x5d5x2jq1g.fsf@lola.goethe.zz>
vonroach <hadrainc@earthlink.net> writes:
> On Wed, 22 Dec 2004 01:56:47 GMT, "Nicholas O. Lindan" <see@sig.com>
> wrote:
>
>>If I treat 0 as an imaginary number
>
> Now you say 0= -1^1/2? You are using your imagination.
0 is even, but not odd, but it is _both_ a purely real and a purely
imaginary number. And it is the _only_ number that manages that feat.
Like f(x)=0 is the only function that manages the feat to be at the
same time an even and an odd function.
--
David Kastrup, Kriemhildstr. 15, 44793 Bochum
------------------------------
Date: Wed, 22 Dec 2004 15:51:57 GMT
From: "Kevin Aylward" <salesEXTRACT@anasoft.co.uk>
Subject: Re: Is zero even or odd?
Message-Id: <xKgyd.2110$0W6.673@fe2.news.blueyonder.co.uk>
vonroach wrote:
> On Mon, 20 Dec 2004 14:34:03 -0000, BB <BB@BB.BB> wrote:
>
>> The divisor would have to be something smaller than 0 like -2.
>> Therefore zero is both even and negative.
>
> Whoa! A new concept: -0. Let's make up some other numbers. I suggest
> wizzad and fugawe. I'd have suggested Arunda, but I believe some
> obscure African group already uses that in their alphabet.
-0 often/usually signifies a limit approaching from the negative
direction.
Kevin Aylward
salesEXTRACT@anasoft.co.uk
http://www.anasoft.co.uk
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.
------------------------------
Date: Wed, 22 Dec 2004 15:52:43 GMT
From: "Kevin Aylward" <salesEXTRACT@anasoft.co.uk>
Subject: Re: Is zero even or odd?
Message-Id: <fLgyd.2114$0W6.1277@fe2.news.blueyonder.co.uk>
vonroach wrote:
> On Tue, 21 Dec 2004 07:08:11 GMT, "Kevin Aylward"
> <salesEXTRACT@anasoft.co.uk> wrote:
>
>> Fred Bloggs wrote:
>>> Alfred Z. Newmane wrote:
>>>> Nicholas O. Lindan wrote:
>>>>
>>>>> "John Sefton" <john@petcom.com> wrote
>>>>>
>>>>>
>>>>>> 0 can't be divided by itself,
>>>>>
>>>>> Sure it can: 0 / 0 = 0 * (1 / 0) = 0 * infinity = 1
>>>>>
>>>>> It works if the only three numbers in the universe are
>>>>> 0, 1, and infinity -- A number system that seems very
>>>>> suited to usenet.
>>>>
>>>>
>>>> Except for the fact that: 0 / 0 = undefined
>>>>
>>>> Or actually more correct: n / 0 = undefined
>>>>
>>>>
>>>
>>> 0/0={ SET OF ALL INTEGERS }
>>
>> No.
>>
>>>
>>> n/0= NULL SET for n<>0
>>>
>>> It is very well-defined.
>>
>> No it isnt.
>>
>> Kevin Aylward
> Now that you are in to definitions, what does `Aylward' mean?
"Warden of the King's Ale"
Kevin Aylward
salesEXTRACT@anasoft.co.uk
http://www.anasoft.co.uk
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.
------------------------------
Date: 22 Dec 2004 16:59:55 +0100
From: Arndt Jonasson <do-not-use@invalid.net>
Subject: Re: Is zero even or odd?
Message-Id: <yzd652ujpc4.fsf@invalid.net>
"Kevin Aylward" <salesEXTRACT@anasoft.co.uk> writes:
> vonroach wrote:
> > On Mon, 20 Dec 2004 14:34:03 -0000, BB <BB@BB.BB> wrote:
> >
> >> The divisor would have to be something smaller than 0 like -2.
> >> Therefore zero is both even and negative.
> >
> > Whoa! A new concept: -0. Let's make up some other numbers. I suggest
> > wizzad and fugawe. I'd have suggested Arunda, but I believe some
> > obscure African group already uses that in their alphabet.
>
> -0 often/usually signifies a limit approaching from the negative
> direction.
And in computing, there are representations of integers in binary that
have both a 0 and a -0. Of floating-point too, for that matter.
------------------------------
Date: Wed, 22 Dec 2004 09:25:29 -0500
From: "Roll" <lie_huo@hotmail.com>
Subject: need help in programming linux with perl
Message-Id: <059972638b42ea4f1d4fc9ece9ec0652@localhost.talkaboutprogramming.com>
hi ppl
i need to configure the linux dns, dhcp and iptables all that using a web
based control and i know that i could do so using perl programming.
basically what i need is to use perl to program out a cgi for me to edit
the .conf file of linux dhcp, dns and iptables using a webpage. can anyone
help me or give me or let me know if there is a guide for me to learn how
to do all this.
anyone who can help can email to me at lie_huo@htmail.com.
thanks to all those who help.
------------------------------
Date: Wed, 22 Dec 2004 14:30:39 -0000
From: "Brian Wakem" <no@email.com>
Subject: Re: need help in programming linux with perl
Message-Id: <32teofF3p4r1fU1@individual.net>
"Roll" <lie_huo@hotmail.com> wrote in message
news:059972638b42ea4f1d4fc9ece9ec0652@localhost.talkaboutprogramming.com...
> hi ppl
> i need to configure the linux dns, dhcp and iptables all that using a web
> based control and i know that i could do so using perl programming.
> basically what i need is to use perl to program out a cgi for me to edit
> the .conf file of linux dhcp, dns and iptables using a webpage. can anyone
> help me or give me or let me know if there is a guide for me to learn how
> to do all this.
>
> anyone who can help can email to me at lie_huo@htmail.com.
> thanks to all those who help.
Have you looked at Webmin?
http://www.webmin.com/
--
Brian Wakem
------------------------------
Date: Tue, 21 Dec 2004 22:32:17 -0600
From: "die" <bbeaman2@cox.net>
Subject: newbie question...can't die..whod a thunk it?
Message-Id: <pl9yd.394$4h.236@okepread03>
Is there any reason the script below should not print the message after
'die'?Thanks.
----------------------------------------------------
$var1='a';
$var2='b';
print"Content-type:text/html\n\n";
$var1 eq "$var2" or die "PERL die function\n";
----------------------------------------------------
------------------------------
Date: 22 Dec 2004 07:53:26 GMT
From: anno4000@lublin.zrz.tu-berlin.de (Anno Siegel)
Subject: Re: newbie question...can't die..whod a thunk it?
Message-Id: <cqb95m$nco$1@mamenchi.zrz.TU-Berlin.DE>
die <bbeaman2@cox.net> wrote in comp.lang.perl.misc:
> Is there any reason the script below should not print the message after
> 'die'?Thanks.
> ----------------------------------------------------
> $var1='a';
> $var2='b';
>
> print"Content-type:text/html\n\n";
>
> $var1 eq "$var2" or die "PERL die function\n";
> ----------------------------------------------------
No.
Anno
------------------------------
Date: 22 Dec 2004 08:46:42 GMT
From: Dave Weaver <zen13097@zen.co.uk>
Subject: Re: newbie question...can't die..whod a thunk it?
Message-Id: <41c93472$0$27242$db0fefd9@news.zen.co.uk>
On Tue, 21 Dec 2004 22:32:17 -0600, die <bbeaman2@cox.net> wrote:
> Is there any reason the script below should not print the message after
> 'die'?Thanks.
> ----------------------------------------------------
> $var1='a';
> $var2='b';
>
> print"Content-type:text/html\n\n";
>
> $var1 eq "$var2" or die "PERL die function\n";
> ----------------------------------------------------
No.
[davew@localhost tmp] $ perl
$var1='a';
$var2='b';
print"Content-type:text/html\n\n";
$var1 eq "$var2" or die "PERL die function\n";
__END__
Content-type:text/html
PERL die function
[davew@localhost tmp] $
Works as expected.
Is there any reason you expect it not to die?
------------------------------
Date: Wed, 22 Dec 2004 10:44:55 +0100
From: Gunnar Hjalmarsson <noreply@gunnar.cc>
Subject: Re: newbie question...can't die..whod a thunk it?
Message-Id: <32sv1oF3qmcrbU1@individual.net>
die wrote:
> Is there any reason the script below should not print the message after
> 'die'?Thanks.
> ----------------------------------------------------
> $var1='a';
> $var2='b';
>
> print"Content-type:text/html\n\n";
>
> $var1 eq "$var2" or die "PERL die function\n";
> ----------------------------------------------------
No. However, die statements are printed to STDERR by default, so if you
run the script from the browser, i.e. as a CGI script, you won't see the
message on the screen. To change that, you can add this line at the
beginning of the script:
use CGI::Carp 'fatalsToBrowser';
--
Gunnar Hjalmarsson
Email: http://www.gunnar.cc/cgi-bin/contact.pl
------------------------------
Date: Wed, 22 Dec 2004 09:42:41 -0500
From: Ken <x3v0-usenet@yahoo.com>
Subject: Re: Newbie question
Message-Id: <CJfyd.12008$FE.4169@fe37.usenetserver.com>
Tad McClellan wrote:
> Ken <x3v0-usenet@yahoo.com> wrote:
>
>>Dave Weaver wrote:
>>
>>>On Mon, 20 Dec 2004 09:37:47 -0500, Ken <x3v0-usenet@yahoo.com> wrote:
>>>
>>>
>>>>Try this instead:
>>>>
>>>>prepare();
>>>>
>>>>You can't call subroutines without the parentheses.
>>>
>>>
>>>Yes you can, as long as the sub has been defined before the call:
>
>
>
>>Cool I didn't know that. Still, probably not a good habit to get into.
>
>
>
> Why not?
>
>
I just think it can get confusing. When you put the empty (), you know
right away that it is a sub. Maybe it's just my own personal habit
though. Also, I have always put subs at the bottom of my script which is
probably why I've never tried calling a sub as a bare word.
So it's bad habit only because it could be confusing to someone else
reading your script. And because it looks weird ;).
------------------------------
Date: Wed, 22 Dec 2004 10:46:06 +0100
From: "Bill Parker" <bill@gites.org.uk>
Subject: Re: selecting STDOUT AND STDERR
Message-Id: <41c9425f$0$9538$8fcfb975@news.wanadoo.fr>
>> $stdout = select(LOG)
>> print "something\n";
>> select($stdout);
>
>
> What does that get you?
>
> Why not just
>
> print LOG "something\n";
>
> instead, with no select()ing required?
>
Because I don't necessarily know what is going to be output during the run
of the proggie, or what subcalls are going to generate any output. And as I
want it to write ALL it's output to a file, rather than (in my case anyway)
get lost by Windoze, a global redirect of STDOUT (and STDERR) is a
cheap'n'easy way for me to achieve it. It's a trick I use on shell
scripting, which also helps me keep the code looking a bit neater...
>
>> But can I exactly mimic the ksh/bash redirect of stderr as well as
>> stdout?
> ^^^^^^
>
> perldoc -q stderr
>
Hey, this works on Activestates perl and Windoze. Impressed am I! Thanks for
this tip. Complicated looking output - I may have to turn my brain on to
handle it :-} I need to make more use of perldoc, obviously.
> The very first sentence of
>
> perldoc -f die
>
> answers that.
Umm, not that I yet understand why but Activestate requires me to to
perldoc.bat -f die
before it works. But again, good tip. I DID actually mean "try and browse
the docm" rather than being lazy and stating "I'll test it" - as I said, me
being lazy over my typing.
Many thanks, very helpful
Bill
------------------------------
Date: 6 Apr 2001 21:33:47 GMT (Last modified)
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Subject: Digest Administrivia (Last modified: 6 Apr 01)
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------------------------------
End of Perl-Users Digest V10 Issue 7552
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