[#68415] eval'ing a config file — Ian Macdonald <ian@...>

Hi,

19 messages 2003/04/01

[#68421] sharing objects between tests (revisited?) — Paul Brannan <pbrannan@...>

I don't know if I've asked this on this list before or only on irc (I

13 messages 2003/04/01

[#68436] April Fools. — Daniel Carrera <dcarrera@...>

Hey guys and gals,

24 messages 2003/04/01

[#68449] Newbie question:read file speed — "Greg Brondo" <greg@...>

Why is ruby (on windows) so much slower at reading lines in a file (as

36 messages 2003/04/01

[#68527] Any Hardware/EDA engineers out there? — ptkwt@...1.aracnet.com (Phil Tomson)

12 messages 2003/04/03

[#68605] keeping track of non-exported global variables — "Simon Strandgaard" <0bz63fz3m1qt3001@...>

problem:

12 messages 2003/04/04

[#68623] To inherit or to include? That is the question. — Jim Freeze <jim@...>

Hi

11 messages 2003/04/04

[#68707] Call for standardised package installation procedure — google@... (Tom Payne)

I'm helping maintain Ruby and Ruby packages in Gentoo Linux.

57 messages 2003/04/06
[#68712] Re: Call for standardised package installation procedure — "James Britt" <james@...> 2003/04/06

> It would make my job a lot easier if just one were chosen, and perhaps

[#68729] Re: Call for standardised package installation procedure — "Hal E. Fulton" <hal9000@...> 2003/04/06

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

[#68738] Re: Call for standardised package installation procedure — google@... (Tom Payne) 2003/04/07

John Johnson <jj5412@earthlink.net> wrote in message news:<1049655145.1847.10.camel@hppav.home.net>...

[#68779] Re: Call for standardised package installation procedure — Austin Ziegler <austin@...> 2003/04/07

On Mon, 7 Apr 2003 16:47:20 +0900, Tom Payne wrote:

[#68781] Re: Call for standardised package installation procedure — Mauricio Fern疣dez <batsman.geo@...> 2003/04/07

On Tue, Apr 08, 2003 at 02:34:26AM +0900, Austin Ziegler wrote:

[#68826] Re: Call for standardised package installation procedure — Gavin Sinclair <gsinclair@...> 2003/04/08

On Tuesday, April 8, 2003, 3:42:49 AM, Mauricio wrote:

[#68803] Having trouble getting iconv-0.5 working on OS X — Sam Roberts <sroberts@...>

I do a make, install, and then:

10 messages 2003/04/08
[#68806] Re: Having trouble getting iconv-0.5 working on OS X — Nobuyoshi Nakada <nobu.nokada@...> 2003/04/08

Hi,

[#68811] Array Sutraction — Jim Freeze <jim@...>

Ok, this has been discussed at length previously,

25 messages 2003/04/08
[#68820] Re: Array Sutraction — "Robert Klemme" <bob.news@...> 2003/04/08

[#68828] Re: Array Sutraction — Michael Campbell <michael_s_campbell@...> 2003/04/08

>

[#68843] Ruby for graphics — "Your Name Here" <jim@...>

I just learned of Ruby, and was wondering if its a good lang for

17 messages 2003/04/08
[#68844] Re: [Q] Ruby for graphics — Michael Campbell <michael_s_campbell@...> 2003/04/08

--- Your Name Here <jim@fivek.com> wrote:

[#68908] The "!" and "?" characters. — Daniel Carrera <dcarrera@...>

One of the things I like about Ruby is that it can use ! and ? in method

22 messages 2003/04/08

[#68929] embedding ruby — emilie3012@... (Steve Hart)

Please forgive the following if answers appear elsewhere but I have

13 messages 2003/04/09

[#68943] unknown node type 0 — Francois GORET <fg@...>

Hello,

12 messages 2003/04/09

[#68996] ANN: ri v1.8 — Dave Thomas <dave@...>

I'm releasing a very preliminary version of 'ri' for Ruby 1.8. This

21 messages 2003/04/09

[#69025] tutorial on embedding ruby (review) — "Simon Strandgaard" <0bz63fz3m1qt3001@...>

What do you think about it ?

30 messages 2003/04/09

[#69054] PRIVATE AND CONFIDENTIAL — "Mr. John Eze" <mr_musa3@...>

16 messages 2003/04/10
[#69066] Re: PRIVATE AND CONFIDENTIAL — Peter Hickman <peter@...> 2003/04/10

As an aside not only would the origonal spam be removed by your rules,

[#69096] Need IO Optimization help — Jim Freeze <jim@...>

Hello:

69 messages 2003/04/10
[#69197] Re: Need IO Optimization help — ptkwt@...1.aracnet.com (Phil Tomson) 2003/04/11

In article <20030411115918.A35958@linnet.org>,

[#69239] Does dynamic typing make it easier to place an object in a container? — Mark Wilson <mwilson13@...> 2003/04/12

The following is from

[#69240] Re: Does dynamic typing make it easier to place an object in a container? — Joel VanderWerf <vjoel@...> 2003/04/12

Mark Wilson wrote:

[#69245] Re: Does dynamic typing make it easier to place an object in a container? — Ryan Pavlik <rpav@...> 2003/04/12

On Sat, 12 Apr 2003 13:40:07 +0900

[#69581] Re: Need IO Optimization help — David King Landrith <dave@...> 2003/04/17

In my experience, the fastest way to access files (by far) is mmap.

[#69583] Re: Need IO Optimization help — Jim Freeze <jim@...> 2003/04/17

On Thursday, 17 April 2003 at 19:29:16 +0900, David King Landrith wrote:

[#69591] Re: Need IO Optimization help — David King Landrith <dave@...> 2003/04/17

On Thursday, April 17, 2003, at 06:45 AM, Jim Freeze wrote:

[#69593] Re: Need IO Optimization help — Jim Freeze <jim@...> 2003/04/17

On Thursday, 17 April 2003 at 22:11:55 +0900, David King Landrith wrote:

[#69179] Two questions — "Steve Adams" <adamss@...>

What restrictions does the Ruby license place on the construction and sale

14 messages 2003/04/11

[#69194] splat question — "Chris Pine" <nemo@...>

(This question assumes that the unary `*' (used in arrays and such) is

13 messages 2003/04/11

[#69214] class documentation — "Bermejo, Rodrigo" <rodrigo.bermejo@...>

Hi all;

13 messages 2003/04/11

[#69271] Controlling an interactive program from Ruby — Daniel Carrera <dcarrera@...>

Hi,

12 messages 2003/04/13

[#69280] ruby_script() — "Simon Strandgaard" <0bz63fz3m1qt3001@...>

I am wondering what exactly ruby_script() is doing ?

15 messages 2003/04/13

[#69357] A class, that knows about it's instances + Sets — KONTRA Gergely <kgergely@...>

Hi!

11 messages 2003/04/14

[#69413] rb_class_new_instance behaves strange — "Simon Strandgaard" <0bz63fz3m1qt3001@...>

My code is behaving different, when im doing this change:

23 messages 2003/04/15

[#69424] Urgent Assistance — "Victor Aloma" <victorloma@...>

12 messages 2003/04/15

[#69439] ANN: Debian packages of FreeRIDE, FOX, FXRuby, Ripper, FXScintilla, etc — Mauricio Fern疣dez <batsman.geo@...>

9 messages 2003/04/15

[#69470] regular expressions — "Chris Pine" <nemo@...>

When I first learned regular expressions, they were no problem. It was in a

27 messages 2003/04/15

[#69518] Roundoff problem with Float and Marshal — cilibrar@... (Rudi Cilibrasi)

The following small test program:

29 messages 2003/04/16

[#69536] Reg. Expressios with "\n" — Daniel Carrera <dcarrera@...>

Hello,

14 messages 2003/04/16

[#69585] extension - redirect a block — student_vienna@... (daniel)

hello,

11 messages 2003/04/17

[#69595] ANN: ri 1.8b — Dave Thomas <dave@...>

I've updated ri:

14 messages 2003/04/17

[#69645] avoiding the module name — "Simon Strandgaard" <0bz63fz3m1qt3001@...>

11 messages 2003/04/17

[#69700] Biased weighted random? — "Hal E. Fulton" <hal9000@...>

Hi, all...

51 messages 2003/04/18

[#69762] Multi-Lingual Ruby — Jim Weirich <jweirich@...>

I was following a Java VS Perl discussion on a web board that I read.

12 messages 2003/04/20

[#69806] ASCII class inheritance tree generator — Simon Vandemoortele <deliriousNOSPAM@...>

I thought I might share this little piece of code that generates a

10 messages 2003/04/21

[#69830] Ruby in a university course — "Chad Fowler" <chadfowler@...>

Maybe this has already been covered here, but I found it interesting that Cem Kaner is using Ruby in a software testing course at the Florida Institute of Technology. (I'm guessing this is due to some influence that Brian Marick had on him).

14 messages 2003/04/21

[#69931] Ruby.shop — "Hal E. Fulton" <hal9000@...>

Hello, all.

28 messages 2003/04/23

[#69956] grep and regular expressions in ruby — "Krishna Dole" <kpd@...>

I'm quite taken with ruby, but recently I ran into trouble using grep. I

15 messages 2003/04/23

[#69969] Subject: Re: [ANN] Ruby.shop — Jim Weirich <jweirich@...>

On Wed, 2003-04-23 at 18:16, Hal E. Fulton wrote:

18 messages 2003/04/24

[#70015] How to call an object instance's method? — Rene Tschirley <pooh@...>

Dear Ruby Experts,

28 messages 2003/04/24
[#70016] Re: How to call an object instance's method? — "Robert Klemme" <bob.news@...> 2003/04/24

[#70019] Re: How to call an object instance's method? — Rene Tschirley <pooh@...> 2003/04/24

Robert Klemme wrote:

[#70072] Re: How to call an object instance's method? — "Chris Pine" <nemo@...> 2003/04/24

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

[#70017] MathN — Dave Thomas <dave@...>

I'm trying to get to grips with the 'mathn' library. I can see what it

12 messages 2003/04/24

[#70034] block.call vs. yield — "Orion Hunter" <orion2480@...>

I noticed that the use of block/yield differs slightly when a "break" is

44 messages 2003/04/24
[#70046] Re: block.call vs. yield — matz@... (Yukihiro Matsumoto) 2003/04/24

Hi,

[#70087] Re: block.call vs. yield — matz@... (Yukihiro Matsumoto) 2003/04/25

Hi,

[#70113] Re: block.call vs. yield — dblack@... 2003/04/25

Hi --

[#70182] Re: block.call vs. yield — "Hal E. Fulton" <hal9000@...> 2003/04/26

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

[#70189] Re: block.call vs. yield — dblack@... 2003/04/26

Hi --

[#70039] Accessing Ruby class from C extention — ptkwt@...1.aracnet.com (Phil Tomson)

I know it's possible to write Ruby in C but is it possible to instantiate

16 messages 2003/04/24

[#70064] Hashes and Enumerable#each_with_index — Ryan Pavlik <rpav@...>

OK, looking at the archives I know this was discussed a few years ago,

16 messages 2003/04/24

[#70265] Generating a DLL file? — "Rich" <rich@...>

Let's start with:

22 messages 2003/04/27
[#70277] Re: Generating a DLL file? — "Rich" <rich@...> 2003/04/28

I don't know C - or C++... and I'd rather not learn.

[#70280] Re: Generating a DLL file? — Michael Campbell <michael_s_campbell@...> 2003/04/28

--- Rich <rich@lithinos.com> wrote:

[#70268] c++/ruby debugging advices — "Simon Strandgaard" <0bz63fz3m1qt3001@...>

Im embedding ruby into c++ and im having a segfault problem which

11 messages 2003/04/27

[#70422] Pass-by reference VS encapsulation ? — Simon Vandemoortele <deliriousREMOVEUPPERCASETEXTTOREPLY@...>

34 messages 2003/04/30

Re: Matrix bug

From: "Chris Pine" <nemo@...>
Date: 2003-04-22 14:38:04 UTC
List: ruby-talk #69879
----- Original Message -----
From: "Stephan K舂per" <Stephan.Kaemper@Schleswig-Holstein.de>

<snip lecture>
Now speaking in integers 5 / 9 IS 0, while 5 % 9 IS 5.

There's nothing more to it.
----------------------------

I think it's clear that the original poster did *not* need the mysteries of
integer arithmetic explained.  :)

Now an explanation for you:

Getting back to an earlier post in this thread, we have this:

  irb(main):002:0> m = Matrix[[1, 3], [2, 4]]
  Matrix[[1, 3], [2, 4]]
  irb(main):003:0> n = m.inv
  Matrix[[-3, 2], [1, -1]]

Now, however you may feel about integer division, this is just WRONG.  That
is not the inverse of that matrix an *any* sense of the word.  That is, in
fact, a totally meaningless answer.

The original poster was not saying that Ruby is buggy.  The original poster
was certainly not saying *anything* about integer arithmetic being buggy.
The original poster was saying that the above is wrong in every situation.
Until you can find any way in which the above is the desired behavior, or is
even meaningful at all, I don't see why you would feel the need to disagree
with this.


----------------------------
I personally think that you should be as explicit as possible
<snip something about some P-language>
In this case that means that you should probably feed the matrices with
floating point numbers rather than integers.
----------------------------

?!?  Because they are more "explicit"??  You seem to know a lot more about
integer arithmetic than about floating-point arithmetic.

Anyone doing serious floating point computation has to be concerned with
error accumulation, rounding errors, numbers too big or small to fit into a
float... it's all about minimizing error!


Anyway, here's another possible solution (instead of just requiring mathn):

It could check when it is loaded if 5/9 is zero or not.  If so, it could
generate an error or spit out a warning or something.  This would allow one
to use matrix with a different math package, if you wanted.  The warning
could even suggest possible solutions (like including mathn instead).

Chris



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