[#52047] ruby-talk separation, part II — " JamesBritt" <james@...>

32 messages 2002/10/01
[#52099] Re: ruby-talk separation, part II — Holden Glova <dsafari@...> 2002/10/01

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[#52111] Re: ruby-talk separation, part II — "Bulat Ziganshin" <bulatz@...> 2002/10/01

[#52118] Re: ruby-talk separation, part II — Jim Freeze <jim@...> 2002/10/01

On Tue, Oct 01, 2002 at 09:03:44PM +0900, Bulat Ziganshin wrote:

[#52167] Re: ruby-talk separation, part II — Sean Chittenden <sean@...> 2002/10/01

FreeBSD's got a decent setup. Few additions to the list here:

[#52245] Compiling stuff under Windows: list of problems — "Gavin Sinclair" <gsinclair@...>

I don't want my tortuous experience of trying to get things working under this

13 messages 2002/10/02

[#52259] bugs — "Kontra, Gergely" <kgergely@...>

Hi!

26 messages 2002/10/02
[#52261] Re: bugs — nobu.nokada@... 2002/10/02

Hi,

[#52269] Re: bugs — "Stathy G. Touloumis" <stathy.touloumis@...> 2002/10/02

[#52300] Can soneone tell me what I'm doing wrong... — Jeremy Gregorio <gunvalk@...>

I'm trying to write a little script to rename my mp3s I started with this:

15 messages 2002/10/02

[#52391] CRuby (Was: R) — Nikodemus Siivola <tsiivola@...>

CRuby = subset of Ruby + typed methods + compiler to C

28 messages 2002/10/03
[#52395] Re: CRuby (Was: R) — Anders Bengtsson <ndrsbngtssn@...> 2002/10/03

Nikodemus Siivola wrote:

[#52400] Re: CRuby (Was: R) — Michael Campbell <michael_s_campbell@...> 2002/10/03

[#52402] Re: CRuby (Was: R) — Anders Bengtsson <ndrsbngtssn@...> 2002/10/03

Michael Campbell wrote:

[#52436] Specifying local and external block parameters (that old chestnut) — "Gavin Sinclair" <gsinclair@...>

I've cannibalised discussion from the "Bugs" thread. I hope it is a service to

49 messages 2002/10/04
[#52440] Re: Specifying local and external block parameters (that old chestnut) — matz@... (Yukihiro Matsumoto) 2002/10/04

Hi,

[#52610] Re: Specifying local and external block parameters (that old chestnut) — "MikkelFJ" <mikkelfj-anti-spam@...> 2002/10/06

[#52612] Re: Specifying local and external block parameters (that old chestnut) — ts <decoux@...> 2002/10/06

>>>>> "M" == MikkelFJ <mikkelfj-anti-spam@bigfoot.com> writes:

[#52557] Speed of Ruby/modruby vs PHP — Jim Freeze <jim@...>

Hi:

27 messages 2002/10/05
[#52598] Re: Speed of Ruby/modruby vs PHP — "MikkelFJ" <mikkelfj-anti-spam@...> 2002/10/06

[#52600] Re: Speed of Ruby/modruby vs PHP — Jim Freeze <jim@...> 2002/10/06

On Sun, Oct 06, 2002 at 08:50:48PM +0900, MikkelFJ wrote:

[#52601] Re: Speed of Ruby/modruby vs PHP — MoonWolf <moonwolf@...> 2002/10/06

> How do I configure mod_ruby to run with a cached script?

[#52628] Re: Speed of Ruby/modruby vs PHP — Jim Freeze <jim@...> 2002/10/06

Ok, here is how I understand this.

[#52636] Re: Speed of Ruby/modruby vs PHP — Jim Freeze <jim@...> 2002/10/06

On Sun, Oct 06, 2002 at 05:07:25PM -0400, Jim Freeze wrote:

[#52581] Platform again — Friedrich Dominicus <frido@...>

Well I ask again. On what platforms are you using ruby most of the

36 messages 2002/10/06

[#52602] Another take on ensuring right args to methods — Massimiliano Mirra <list@...>

11 messages 2002/10/06

[#52653] webforms — "Kontra, Gergely" <kgergely@...>

Hi!

19 messages 2002/10/07

[#52669] Things That Newcomers to Ruby Should Know — billtj@... (Bill Tj)

Hi,

59 messages 2002/10/07
[#52805] Re: Things That Newcomers to Ruby Should Know — "Bulat Ziganshin" <bulatz@...> 2002/10/09

Hello Bill,

[#52982] Re: Things That Newcomers to Ruby Should Know — "Kontra, Gergely" <kgergely@...> 2002/10/11

>3) 'x+=b', 'x*=b' and other assignment operators is internally translated

[#52727] block vars (some theory) — "Bulat Ziganshin" <bulatz@...>

Hello all,

37 messages 2002/10/08
[#52728] Re: block vars (some theory) — ts <decoux@...> 2002/10/08

>>>>> "B" == Bulat Ziganshin <bulatz@integ.ru> writes:

[#52806] strange Hash default behaviour — John Tromp <tromp@...>

I wrote a ruby program to read a list of graph edges and produce

16 messages 2002/10/09

[#52823] CGI sessions without cookies? — Stefan Scholl <stefan.scholl@...>

I haven't tried sessions, yet. But I'm curious if you can work

17 messages 2002/10/09

[#52848] Polymorphism, Isomorphism — ptkwt@...1.aracnet.com (Phil Tomson)

Consider this a bit of public pondering...

21 messages 2002/10/09

[#53045] Sorting — warren@... (Warren Brian Noronha)

dear developer,

31 messages 2002/10/12
[#53048] Re: Sorting — dblack@... 2002/10/12

Hello --

[#53082] Re: Sorting — "Mike Campbell" <michael_s_campbell@...> 2002/10/13

> I think almost anything is a better name than CRAN, as that (to me)

[#53083] Re: Sorting — dblack@... 2002/10/13

Hello --

[#53093] Re: Sorting — "Gavin Sinclair" <gsinclair@...> 2002/10/13

[#53109] Re: Sorting — "Mike Campbell" <michael_s_campbell@...> 2002/10/13

> Just a thought: why *not* copy CPAN? It's pretty good, isn't it?

[#53183] final in ruby — "Kontra, Gergely" <kgergely@...>

Hi!

21 messages 2002/10/14

[#53230] Please check my algorithm — Vincent Foley <vinfoley@...>

Hi, I found a nice programming challenge:

12 messages 2002/10/14

[#53278] ruby-dev summary 18458-18504 — TAKAHASHI Masayoshi <maki@...>

Hi all,

16 messages 2002/10/15

[#53285] Psyco — Travis Whitton <whitton@...>

There's an interesting article on IBM developerWorks about a new program

18 messages 2002/10/16

[#53297] Interfaces in Ruby — web2ed@... (Edward Wilson)

Is there a way to write/inforce interfaces in Ruby like one can using

44 messages 2002/10/16
[#53409] Re: Interfaces in Ruby — web2ed@... (Edward Wilson) 2002/10/17

>http://rm-f.net/~cout/code/ruby/treasures/RubyTreasures-0.3/lib/hacks/interface.rb.html

[#53470] Re: Interfaces in Ruby — Paul Brannan <pbrannan@...> 2002/10/17

On Thu, Oct 17, 2002 at 01:25:57PM +0900, Edward Wilson wrote:

[#53514] Re: Interfaces in Ruby — Massimiliano Mirra <list@...> 2002/10/18

On Fri, Oct 18, 2002 at 12:16:30AM +0900, Paul Brannan wrote:

[#53300] Re: Interfaces in Ruby — Chris Gehlker <canyonrat@...> 2002/10/16

[#53334] Re: Interfaces in Ruby — Paul Brannan <pbrannan@...> 2002/10/16

On Wed, Oct 16, 2002 at 01:30:04PM +0900, Chris Gehlker wrote:

[#53359] Things That Newcomers to Ruby Should Know (10/16/02) — William Djaja Tjokroaminata <billtj@...>

Hi,

29 messages 2002/10/16
[#53774] Re: Things That Newcomers to Ruby Should Know (10/16/02) — "Hal E. Fulton" <hal9000@...> 2002/10/22

----- Original Message -----

[#53556] Help wanted with an experimental FAQ facility — Dave Thomas <Dave@...>

24 messages 2002/10/18

[#53626] XMLParser, NQXML, REXML, ... — Armin Roehrl <armin@...>

Hi XML-freaks,

23 messages 2002/10/20
[#53897] Re: XMLParser, NQXML, REXML, ... — Sean Chittenden <sean@...> 2002/10/23

> Hi XML-freaks,

[#53902] Ruby.bah! (was Re: XMLParser, NQXML... and also RAA.succ) — Austin Ziegler <austin@...> 2002/10/23

On Wed, 23 Oct 2002 13:01:59 +0900, Sean Chittenden wrote:

[#53904] Re: Ruby.bah! (was Re: XMLParser, NQXML... and also RAA.succ) — Sean Chittenden <sean@...> 2002/10/23

> > Markus and I are working on rubydoc which is now able to

[#53911] Re: Ruby.bah! (was Re: XMLParser, NQXML... and also RAA.succ) — Austin Ziegler <austin@...> 2002/10/23

On Wed, 23 Oct 2002 14:07:46 +0900, Sean Chittenden wrote:

[#53652] RAA.succ? — ptkwt@...1.aracnet.com (Phil Tomson)

I hope there will be some discussion of RAA.succ (or is it RAA.next) at

78 messages 2002/10/21
[#53654] Re: RAA.succ? — nobu.nokada@... 2002/10/21

Hi,

[#53669] Re: RAA.succ? — "NAKAMURA, Hiroshi" <nahi@...> 2002/10/21

Hi,

[#54022] RAA replaced — "NAKAMURA, Hiroshi" <nahi@...> 2002/10/24

Hi,

[#53914] Re: RAA.succ? (rpkg vs rubynet) — ptkwt@...1.aracnet.com (Phil Tomson) 2002/10/23

In article <20021023041621.GC48080@perrin.int.nxad.com>,

[#53688] functional Ruby equiv to this perl snippet — bobx@... (Bob)

# parses a text file looking for server names and ignoring lines

29 messages 2002/10/21
[#53694] Re: functional Ruby equiv to this perl snippet — Austin Ziegler <austin@...> 2002/10/21

def load_server_list

[#53696] Re: functional Ruby equiv to this perl snippet — Austin Ziegler <austin@...> 2002/10/21

I realised that my first test wasn't good for non-empty but blank

[#53718] Re: functional Ruby equiv to this perl snippet — "Bob X" <bobx@...> 2002/10/21

"Austin Ziegler" <austin@halostatue.ca> wrote in message

[#53703] rb_gc_register_address problem — Paul Brannan <pbrannan@...>

We ran into a problem today with the garbage collector (caused by our

28 messages 2002/10/21

[#53771] Perl multiple match RE in Ruby? — michael libby <x@...>

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14 messages 2002/10/22

[#53865] XMLRPC and IP authentication — Daniel Berger <djberge@...>

Hi all,

13 messages 2002/10/22

[#53884] SQLite — "Bob X" <bobx@...>

Anyone working on a Ruby interface for SQLite?

109 messages 2002/10/23
[#53894] Re: SQLite — Austin Ziegler <austin@...> 2002/10/23

On Wed, 23 Oct 2002 10:38:31 +0900, Bob X wrote:

[#54714] Thoughts on Ruby — Enric Lafont <enric@1smart.com> 2002/11/03

Hi all,

[#54724] Re: Thoughts on Ruby — Albert Wagner <alwagner@...> 2002/11/03

On Saturday 02 November 2002 7:57 pm, Enric Lafont wrote:

[#54725] Re: Thoughts on Ruby — Austin Ziegler <austin@...> 2002/11/03

On Sun, 3 Nov 2002 10:57:29 +0900, Enric Lafont wrote:

[#54784] Re: Thoughts on Ruby — Enric Lafont <enric@1smart.com> 2002/11/03

Austin Ziegler wrote:

[#54802] Re: Thoughts on Ruby — Austin Ziegler <austin@...> 2002/11/03

On Mon, 4 Nov 2002 06:44:46 +0900, Enric Lafont wrote:

[#54826] Re: Thoughts on Ruby — "Gavin Sinclair" <gsinclair@...> 2002/11/04

From: "Enric Lafont" <enric@1smart.com>

[#54903] Re: Thoughts on Ruby — Brian Candler <B.Candler@...> 2002/11/05

On Mon, Nov 04, 2002 at 10:02:12PM +0900, Gavin Sinclair wrote:

[#54920] Re: Thoughts on Ruby — Austin Ziegler <austin@...> 2002/11/05

On Tue, 5 Nov 2002 20:18:47 +0900, Brian Candler wrote:

[#54927] Re: Thoughts on Ruby lack of IDE — Brad Cox <bcox@...> 2002/11/05

It is a sign of my hybrid Objective-C background, no doubt, but I

[#54929] Re: Thoughts on Ruby lack of IDE — "Curt Hibbs" <curt@...> 2002/11/05

Brad Cox wrote:

[#55322] FreeRIDE and FUI ?? (was: Re: Thoughts on Ruby lack of IDE) — "Rich" <rich@...> 2002/11/08

> > >

[#55346] Re: FreeRIDE and FUI ?? (was: Re: Thoughts on Ruby lack of IDE) — "Rich Kilmer" <rich@...> 2002/11/09

> -----Original Message-----

[#53953] Re: Things That Newcomers to Ruby Should Know (10/16/02) — "Mills Thomas (app1tam)" <app1tam@...>

But why does it really, REALLY mean that? Was there a reason for doing

13 messages 2002/10/23

[#53957] NODE tree introspection — Simon Cozens <simon@...>

13 messages 2002/10/23

[#53983] Re: Things That Newcomers to Ruby Should Know (10/16/02) — "Mills Thomas (app1tam)" <app1tam@...>

Actually, the way you describe '+=' makes sense to me. It is what I would

17 messages 2002/10/23
[#54001] Re: Things That Newcomers to Ruby Should Know (10/16/02) — William Djaja Tjokroaminata <billtj@...> 2002/10/23

Hi,

[#54012] Re: Things That Newcomers to Ruby Should Know (10/16/02) — dblack@... 2002/10/24

Hi --

[#54111] How come true, false don't support <=> (comparison) operator? — cilibrar@... (Rudi Cilibrasi)

I am wondering if there is a good reason why Ruby does not by default

24 messages 2002/10/25
[#54112] Re: How come true, false don't support <=> (comparison) operator? — dblack@... 2002/10/25

Hello --

[#54139] Re: How come true, false don't support <=> (comparison) operator? — ptkwt@...1.aracnet.com (Phil Tomson) 2002/10/25

In article <Pine.LNX.4.44.0210250754010.2650-100000@candle.superlink.net>,

[#54156] Re: How come true, false don't support <=> (comparison) operator? — dblack@... 2002/10/25

Hi --

[#54239] Snippet request: Ruby Web Server written in under an hour — Phlip <phlipcpp@...>

Rubies:

37 messages 2002/10/28
[#54328] Snippet: Tiny Featureless Ruby Web Server — Phlip <phlipcpp@...> 2002/10/29

Rubies:

[#54339] method-call style (was Re: Snippet: Tiny Featureless Ruby Web Server) — dblack@... 2002/10/29

Hi --

[#54517] Re: method-call style (was Re: Snippet: Tiny Featureless Ruby Web Server) — William Djaja Tjokroaminata <billtj@...> 2002/10/30

Bulat Ziganshin <bulatz@integ.ru> wrote:

[#54519] Re: method-call style (was Re: Snippet: Tiny Featureless Ruby Web Server) — dblack@... 2002/10/30

Hi --

[#54525] Re: method-call style (was Re: Snippet: Tiny Featureless Ruby Web Server) — William Djaja Tjokroaminata <billtj@...> 2002/10/30

dblack@candle.superlink.net wrote:

[#54527] Re: method-call style (was Re: Snippet: Tiny Featureless Ruby Web Server) — dblack@... 2002/10/30

Hi --

[#54280] exerb & fox-problem; converting gui-script to .exe on windows — Armin Roehrl <armin@...>

Hi,

12 messages 2002/10/28

[#54354] good link to read as we contemplate RAA, RAA.succ, et al — Pat Eyler <pate@...>

http://www.onlamp.com/pub/wlg/2225

28 messages 2002/10/29
[#54356] Re: good link to read as we contemplate RAA, RAA.succ, et al — dblack@... 2002/10/29

Hi --

[#54385] Re: good link to read as we contemplate RAA, RAA.succ, et al — " JamesBritt" <james@...> 2002/10/29

> Interesting. Simon (hi Simon!) is probably right that "Definitive

[#54421] want to meet Microsoft .NET guy? — matz@... (Yukihiro Matsumoto)

Hi,

17 messages 2002/10/30

[#54449] feature idea: custom literals — loats205@... (loats205)

wouldn't it be cool if you could define custom literal representations for your

30 messages 2002/10/30
[#54459] Re: feature idea: custom literals — Peter Hickman <peter@...> 2002/10/30

loats205 wrote:

[#54476] Re: feature idea: custom literals — Nikodemus Siivola <tsiivola@...> 2002/10/30

Re: How come true, false don't support <=> (comparison) operator?

From: ptkwt@...1.aracnet.com (Phil Tomson)
Date: 2002-10-26 04:06:12 UTC
List: ruby-talk #54169
In article <Pine.LNX.4.44.0210251926200.4149-100000@candle.superlink.net>,
 <dblack@candle.superlink.net> wrote:
>Hi --
>
>On Sat, 26 Oct 2002, Phil Tomson wrote:
>
>> In article <Pine.LNX.4.44.0210250754010.2650-100000@candle.superlink.net>,
>>  <dblack@candle.superlink.net> wrote:
>> >Hello --
>> >
>> >On Fri, 25 Oct 2002, Rudi Cilibrasi wrote:
>> >
>> >> I am wondering if there is a good reason why Ruby does not by default
>> >> support, for instance,
>> >> true <=> false  (should be +1 or -1)
>> >> or even
>> >> false <=> false (should be 0)
>> >
>> >I guess one reason is that it's not clear (to me, anyway) why true
>> >would be > false, or false > true.  Is there ordinality to Boolean
>> >values?
>>
>> Actually if you want to get theoretical and mathematical there is an
>> ordering to boolean values in Boolean Algebra.
>>
>> Here's a definition from one of my textbooks ("Logic Synthesis and
>> Verification Algorithms" by Hachtel and Somenzi):
>>
>> "A complemented, distributive lattice is a Boolean Lattice or Boolean
>> Algebra"
>>
>> What's a lattice:
>>
>> "A lattice is a poset [partially _ordered_ set] (AXA, <=) [meaning that
>> the Cartesian product of the set A with itself with the result ordered by
>> the less-than or equal relation] in which any two elements have a meet
>> [greatest lower bound] and a join [least upper bound].  Consequently, all
>> finite lattices have a _greatest_ element, denoted by 1 [or true], and a
>> least element 0 [or false], where 1 [true] is an element of set A and 0
>> [false] is an element of set A."
>>
>> So technically true is greater than false.
>
>We're waaaay over my head mathematically, but I'm finding this
>interesting enough that I'll go ahead and ask a couple of stupid
>questions :-)
>

No they're good questions...

>1. Why couldn't one swap 'true' and 'false' in your square-bracket
>comments in the above?  That is: why does true have to go with 1 and
>false with 0?

Well, you're getting deep with this one.  I suppose you could say that its 
a human imposed convention to associate 1 with true and 0 with false.
But yes, the book I referred to does (I think in order to play with your 
mind a bit and to illustrate that different types of boolean algebras can 
be concocted [more below]) show an example where the 1 and 0 are switched.
However, I don't think we'd want to do that.  It would be kind of like 
saying that every place in your program where you see a '0' it actually 
means '9' and everyplace you see an '8' it actually means '1' and so on 
like:
0 <--> 9
1 <--> 8
2 <--> 7
3 <--> 6
4 <--> 5

Yes you could do it as a mathematical exercise, but others wouldn't get 
the same meaning out of it.

>
>2. Does being the greatest and least, in a lattice, have to propagate
>to a direct comparison between the two elements?  I'm thinking (by way
>of analogy) of an array: [3,1,5,4], where 5 is the greatest element in
>one sense, and 4 is the greatest in another sense (highest indexed).

Well, a lattice represents a partially ordered set, so some kind of 
comparison relation (which you can define, but usually based on 
less-than-or-equal) needs to exist between them.

3, 1, 5, and 4 are just symbols whose meaning we supply:

3 generally means a cardinality of three as in here are 3 dots: ...
You could just as easily supply some alternate notation as is done by 
Hofstadter in "Godel, Escher, Bach" (yeah, I was reading it again recently :):
0 - means 0
S0 - successor to 0 (1)
SS0 - successor to the successor to 0 (2)
.... and so on.
(oops, jump back from tangent)

And when you look at a set A = [3,1,5,4] you could interpret it as:
4>5>1>3
5>1>3
1>3

if you decide that the cardinality of (or magnitude represented by)  
these symbols is solely based on their index position within the array.

>
>3. Does all of this necessarily apply to Ruby?  That is, does the
>presence of true and false in a programming language imply support for
>Boolean algebra?

Primarily I was responding to your question above: 
"Is there ordinality to Boolean values?"
To which I reply: yes, there is in the context of the Boolean Algebra.  
There has to be for the rules of Boolean Algebra to 'work' at a basic level.
BTW: what we're calling the Boolean Algebra here is commonly 
known as the switching algebra.  I don't want to go into it, but there are 
potentially an infinite number of boolean algebras that could be concocted 
(note the change in case to lower case, where the Boolean Algebra refers 
to the specific  type of boolean algebra that is familiar to us.)

Now whereas true and false are often referred to as boolean values perhaps 
we're splitting semantic hairs to say that that infers a relation to the 
Boolean Algebra since in Ruby true and false are just constant values that 
have no common superclass (as is often proposed) called Boolean.

However, we do depend on boolean operations (&&,||,!,and,or,not) in our 
programs, true? (!false?) ;-)  and we do expect these identities to hold:

true && true  = true  
true && false = false 
true || false = true 
true || true  = true
false || false= false

And if x,y can take on only the values true or false:

if x || y = true
and
   x && y = false
then 
   x is the complement of y and vce versa.

And: x || false = x, x && true = x (Identity)

Given the way we've defined the operators to work with the true and false 
values in Ruby it would seem isomorphic to the Boolean Algebra 
(ie. they match the properties of a boolean algebra in that they are 
Idempotent, Commutative, Associative, Absoptive ( x && (x || y) = x ),
Distributive, Identities,  and there exists a complement)

If it walks like a duck...

>
>These questions are probably all OT babytalk, but I thought I'd give
>it a try, just out of curiosity.
>

it's a fun discussion.

Phil

"What is truth?" - Pilate's question to Jesus circa 33AD

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