bk clone bk://ftp.rubyx.org/rubyx
cd rubyx
bk co

 
mkdir /my/rubyx/dir  (or something like)
./rubyx --root /my/rubyx/dir --download base net disk (for the basics)
./rubyx --root /my/rubyx/dir --download all (for everything)

link

 svg% ruby -e 'p  "%.24f" % (625.91 + 900.00 + 22.00)'
 "1547.909999999999854480847716"
 svg%

 svg% ruby -e 'p  "%.24f" % 1547.91'
 "1547.910000000000081854523160"
 svg%

Dave Thomas explained: It’s about 40 years old, and unlikely to be fixed. Floating point numbers are not represented exactly inside computers, and so floating point comparisons are routinely deprecated in books on programming. Certain values cannot ever be expressed in floating point representation. If you want exact, fractional, math, you should probably use the ‘rational’ library and investigate ‘mathn’. This is the classic article to read link What Every Computer Scientist Should Know About Floating-Point Arithmetic.

Michael Neumann added: In Ruby you can use BigDecimal:

 require 'bigdecimal'
 BigDecimal.new("625.91") + 900 + 22 == BigDecimal.new("1547.91") # => true

How well does the Oracle-compatability mode work for SAP DB? I got to check that as it might be an option to replace the existing Oracle DB dependency.

I will post a few pics from the Linuxtag later. Not too many people here this year. Linux has simply made it into mainstream. The adventure has long gone :-). Got a nice yellow "no software patents" t-shirt.

Some very interesting ruby stuff:

• Artificial Neural Networks: Implemented a multilayer backpropagating artificial neural network using a momentum term and optionally a weight decay term.
• Borges mod_ruby Integration: I have managed to get Borges running using mod_ruby. I will produce a library ready version of that and check it in the Borges project.
• and much more
link

 Smalltalk With Style is now freely available.
 Thanks Suzanne, Ed, and Dave. This is a great book everybody should read!!

 I added the chapter 27 of Smalltalk by Example.
 I added a link to point to the book of Liu: Smalltalk, Object and Design

And it is important to consider that once you commit to, say, iterating over an entire file, that the file must be reasonably small anyway to get decent performance. The same issue exists with collections. Who cares if collect: creates an extra collection or if WriteStream wastes space at the end of a long underlying collection; if these concerns are really so important then probably this huge collection should not exist and/or you should not be iterating over the entire thing anyway.

To put it very simply: you just can not expect a program to work on large data structures just because you micro optimized everywhere. If you want to handle large data structures then it takes planning and specialized algorithms and test cases. If you are not going to put in that effort, then don’t sweat the small stuff. It is very liberating to code with an eye towards correctness and towards algorithmic performance, and not to worry about getting down the constant factor. It seems to lead to lower stress, faster code production, and fewer bugs generated.

link[http://www.ruby-doc.org/downloads/Euruko2003]

The First European Ruby Conference was held at the University of Karlsruhein in Germany, from the 21st to the 22th of June, 2003. It was organized by Michael Neumann, Stefan Schmiedl, Armin Roehrl and with the help from many others.

Thanks to Michael, the presentations were digitally recorded and have been made available as AVI files. Some of theses are now available for download from ruby-doc.org The videos have had the some noise filtering and volume normalization applied, and have been converted to MPEG-1 to reduce (albeit slightly) their size.

Not all of the videos are available right now. Others will go up as time permits me to do the file processing.

I initially had some FTP timeout trouble uploading the files to ruby-doc.org, so I split them into chunks. I decided to leave them this way to help avoid marathon download sessions. To combine the chunks into the complete file you basically just need to 'cat' them in sequence. I've written a Ruby script to do this, available from the video download page. If anyone thinks they can mirror any of these files it would be a tremendous help.

If you know anything about video compression, and can tell me a way to make the files smaller without serious loss of quality, please tell me.

You can get Rake from rubyforge. If you have rubygems installed, then all you need to do is

  gem -i rake

If you have a very recent version of rubygems (i.e. from CVS), then the gen-rdoc option finally produces a decent rendition of the Rake documentation locally.

QuickStartExample

It’s probably because in order to post in the Java ng he has to be 10x as verbose as in the Smalltalk ng.

He probably has to declare himself, cast himself, wrap himself in a try catch block, bubble up any exceptions, use some external iterators, implement some interfaces, and wrap up his primitives in real objects. Maybe after auto-boxing and generics are supported, he’ll only have to post 7 or 8x as often.

Don’t worry James, we appreciate and understand your terseness over here. ;-)

Welcome to my little book. In it, my goal is to teach you a way to think about computation, to show you how far you can take a simple idea: that all computation consists of sending messages to objects. Object-oriented programming is no longer unusual, but taking it to the extreme - making everything an object - is still supported by only a few programming languages.

Can I justify this book in practical terms? Will reading it make you a better programmer, even if you never use "call with current continuation" or indulge in "metaclass hackery"? I think it might, but perhaps only if you’re the sort of person who would read this sort of book even if it had no practical value.

The real reason for reading this book is that the ideas in it are neat. There’s an intellectual heritage here, a history of people building idea upon idea. It’s an academic heritage, but not in the fussy sense. It’s more a joyous heritage of tinkerers, of people buttonholing their friends and saying, "You know, if I take that and think about it like this, look what I can do!"

link

The code is on SqueakSource: kilana.unibe.ch:8888/ObjectiveCBridge/ObjectiveC-avi.70.mcz You can get a prebuilt plugin (for use with Ian’s 3.7 VM) here: beta4.com/~avi/ObjectiveCPlugin The browser demo can be run with "CCBrowser test". It requires this nib file: beta4.com/~avi/CCBrowser.tgz You need to untar that and place it inside Contents/Resources/English.lproj of your VM application bundle. I’m announcing this partly because I’ve run out of steam on it for now, and am hoping someone else will take it the next step of building UIs for the various Squeak tools (browsers, debuggers, workspaces, inspectors, etc) in Cocoa. A custom NSMorphicView would also be cool, although might be pretty tricky. Anyway, if someone does try to take this on, I’ll be more than happy to answer any questions they have about the underlying bridge code.

 I have run Compiere251d with Oracle10g & Java 1.5 beta :-), and I am very nice.

 You have to make the step:

 1.- Copy the $ORACLE_HOME/jdbc/lib/ojdbc14.jar
 to $COMPIERE_HOME/lib/oracle10g.jar

 2.- Change into $COMPIERE_HOME/RUN_setup.sh  in the -classpath oracle.jar for
 oracle10g.jar

(Source: whytheluckystiff) The (Poignant) Guide is a new approach to teaching Ruby, emphasizing the lingual traits of Ruby and illustrating its uniqueness with comics, visual imagery, and songs with accompanying hand gestures.

This date marks the release of the first three chapters. Feel free to tell your friends and family (a.k.a. Slashdot) about the news. With enough input and support, this book could see completion by next year. Hopefully this is a step towards explaining to the world why Ruby is such an enticing and voluptuous gem to behold.

Go and enjoy the book

Okay, I’ll keep this short. If you want to read more about my motivation, head over to the announcement on my site. motivation

Of course, the devil’s in the details: there’s inventory to manage, backorders to fulfill, outstanding invoices to collect, orders to process, bills to pay, and customers to service. The goal of business may be simple enough — but the business of running a business is anything but.

Fortunately, computers are a natural for the back office, and software to manage a business — called customer relationship management (CRM) and enterprise resource management (ERP) software — has become a big business in itself. SAP, Oracle, PeopleSoft, and Microsoft charge plenty of beans for bean counting software. For example, Microsoft’s Great Plains Software division charges $50,000 for a license, $100,000 for implementation, and $20,000 a year for maintenance.

But just as Linux has provided a free alternative to proprietary operating systems like Windows and Solaris, Compiere, this month’s "Project of the Month," provides an open source alternative to commercial CRM and ERP solutions. link

Unlike cameras, infra-red, RF systems or tilt technologies, Gametrak. allows movement forwards and backwards as well as up, down, left and right.

With Gametrak you can punch your opponents with your hands; sports games let you pick up and play using real golf clubs or tennis racquets . you can even bounce virtual basketballs!

Designed and manufactured by In2Games, Gametrak will launch across Europe o­n PS2 in September 2004 with the revolutionary fighting game, Dark Wind.

Future Gametrak titles include golf, baseball, adventure, dancing and basketball games.

FAQ

 Microsoft may be making a colossal mistake by trying to force
 the industry into a next-generation cycle before it is ready
 to move. Sony, with its enormous dominance of the market, could
 probably just about get away with it - if it moved, the industry
 would have to move with it, however much it hated the idea. But
 Microsoft, still a relatively small player in the games industry,
 just doesn't look like a company that has the influence needed to
 force a shift like this. It may be backed up by the biggest
 software company in the world, but publishers will still look at
 the bottom line - in this case, installed base and cost of
 development - and base their decisions on that alone. Herein lies
 the arrogance; Microsoft isn't used to making decisions as an
 industry small-fry, and it's trying to act like an industry leader
 in an industry it simply doesn't lead.