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Ruby Hacking Guide   15 Jul 06
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This is the home page of the project to translate into English the Ruby Hacking Guide. The RHG is a book that explains how the ruby interpreter (the official C implementation of the Ruby language) works internally.

To fully understand it, you need a good knowledge of C and Ruby. The original book includes a Ruby tutorial (chapter 1), but it has not been translated yet, and we think there are more important chapters to translate first. So if you have not done it yet, you should read a book like the Pickaxe first.

Please note that this book was based on the source code of ruby 1.7.3 so there are a few small differences to the current version of ruby. However, these differences may make the source code simpler to understand and the Ruby Hacking Guide is a good starting point before looking into the ruby source code. The version of the source code used can be downloaded here: i.loveruby.net/ja/rhg/ar/ruby-rhg.tar.gz.

Many thanks to RubyForge for hosting us and to Minero AOKI for letting us translate his work.

rhg.rubyforge.org/

R Graph Gallery   20 Jun 06
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I came across this useful posting by Gregor Gorjanc in the r-help ML.

  • R graphical manuals (this is awesome page as there are all help pages of all packages on CRAN and probably even more and all graphics examples are displayed! - more than 8000 images!)

bg9.imslab.co.jp/Rhelp/

This is a very nice addition to already existing R graph and movies galleries

  • R Graph Gallery

addictedtor.free.fr/graphiques/

  • R Movies Gallery

addictedtor.free.fr/movies/

Refactoring Demo Screencast   21 May 06
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Four different ways of performing the refactoring "Extract Method".

xp123.com/xplor/xp0605/index.shtml

Multitouch Interaction Research   13 May 06
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Bi-manual, multi-point, and multi-user interactions on a graphical interaction surface.

Amazing video. I want one!

Google Tech Talks   11 May 06
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Google has tons of interestings videos worth watch about a range of different topics.

This morning I watched Kevin Kelly’s "The next 50 years of science".

The scientific method which provides us with so many … all technological goodies does not resemble the science of 1600. Ever since Bacon, science has undergone a slow evolution.

Landmarks in the history of the scientific method are the invention of libraries, indexes, citations, controlled experiments, peer review, placebos, double blind experiments, randomization, and search among others. At the core of the scientific method is the structuring of information.

In the next 50 years, as the technologies of information and knowledge accelerate, the nature of the scientific process will change even more than it has in the last 400 years. We can’t predict what specific inventions will arise in the next 50 years, but based on long-term trends in epistemic tools, I believe we can speculate on how the scientific method itself — that is, how we know — will change in the next five decades

Sven's idea scratchpad   27 Apr 06
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Sven C. Koehler has finally put up his own blog "Symbol Thinking".

A bad citizen in Javaland   27 Apr 06
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Excellent blog entry by Darren Hobbs.

On myth and religion in the incredibly ugly network   26 Apr 06
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Comop.lang.smalltalk excerpt between Joachim Tuchel and Andre Schnoor.
 Joachim Tuchel wrote:
 > >> ... Why on earth does it seem everybody believes that JBOSS or any EJB
 > >> environment will scale with no limits? After all, it's a bunch of Java
 > >> classes running in a JVM, just like seaside is a bunch of SMalltalk
 > >> classes runnung in a Smalltalk-VM....

 Andre Schnoor answered
 Marketing. The right buzz words and false promises within a perfect
 > opportunity window in history - and there you are. If something is new (I
 > mean so new that nobody can actually grasp it), hype and buzz sometimes
 > work like religion: You believe what you want to believe. You find
 > yourself spreading the word before you actually had a look at it. Suddenly
 > there are 5 million people chiming in, while only a mere 0,05% of them
 > really know what they are talking about. The big bang of myths.
 >
 > I ran rather large sites with 8 million+ monthly visitors and 7-8
 > Terrabytes of bandwith on a single 4 CPU Sun. Others required 16 Suns for
 > less traffic. It mostly depends on your database model and how frequently
 > users interact with content that is compiled "live" (not cached). The
 > basic application scripting doesn't account much to it.
 >
 >  From the perspective of a classic software engineer (and with an extra
 > bias towards German "Gruendlichkeit"), web technology in general is a huge
 > pile of complicated, heterogenous, incredibly expensive and annoying crap.
 > All that in-band signalling, all those stone age protocols and character
 > sets, quick & dirty hacks, spaghetti scripting,
 >   what-happens-next-machines ... think about how incredibly *ugly* this
 > network actually is  ;-)
 >
 > Seaside looks like a very beautiful and innovative thing. You should give
 > it a try.
 >
 >

.. Largo Argentino ..

Top ten lines of entrepreneurs   26 Apr 06
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Guy Kawasaki has a nice blog posting.

.. and here are the top ten lies of venture capitalists.

Croquet video   26 Apr 06
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Marcus Denker’s Seaside talk from 22C3 is available as video now: events.ccc.de/2006/04/21/gentlemen-fire-up-your-clients/

The file is called 22C3-599-en-seaside_squeak.mp4 (almost an hour, 346 MB).

The image used (This contains all slides as Squeak Projects): www.iam.unibe.ch/~denker/talks/22c3.zip "Slides" as pdf (e.g. for printing): www.iam.unibe.ch/~denker/talks/22c3.pdf

My favorite gem command   07 Apr 06
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This tiny command installs all the doc to all installed gems.
 gem rdoc --all

Then start the gem server

 gem_server

BSP on MPI   31 Mar 06
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BSPonMPI is a platform-independent communication library for developing parallel (SPMD) programs. It implements the BSPlib standard and runs on all machines which have MPI.

Great pics from Italy   31 Mar 06
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Anna, a big thanks for the link.

When will I next be in Italy? :-).

puf - Parallel URL fetcher   31 Mar 06
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puf is a download tool for UNIX-like systems. You may use it to download single files or to mirror entire servers. It is similar to GNU wget (and has a partly compatible command line), but has the ability to do many downloads in parallel. This is very interesting, if you have a high-bandwidth internet connection.

On debian:

  apt-get install puf

puf is one of these great commandline tools that one simply loves!

Zebra tables: making nicer tables with CSS   07 Mar 06
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Thanks to Sven C. Koehler for the link. It explains how to make zebra tables without needing to apply a CSS class to each tr.

Must read: Bjarne Stroustrup Interview about C++   03 Mar 06
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hp.vector.co.jp/authors/VA000092/jokes/strup.html

Linkdump on CSS   02 Mar 06
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I asked Stefan for help on some CSS problems and here are the links that he recommended after fixing my problem:

www.dezwozhere.com/links.html

www.meyerweb.com/eric/writing.html

www.mezzoblue.com/zengarden/resources/

www.meyerweb.com/eric/css/edge/

Fun with Spotlight   01 Mar 06
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Thank to Sven C. Koehler for the following scripts. He uses spotlight to datamine the Enron email data :-).

# convertEnronEmail

 #!/usr/bin/perl -0p
 s/^M//gsm;
 ($date) = /^(Date: [^\n]+)/sm;
 ($from) = /^From:\s*([^\n]+)/sm;
 print "From $from @{[scalar localtime]}\n";
 s/\Z/\n/;

#enronEmailsForKeyword

 #! /bin/sh
 mdfind "kMDItemTextContent == '${1+"$@"}'" | grep /enron/

#enronGrep

 #! /bin/sh
 enronEmailsForKeyword ${1+"$@"} | xargs grep ${1+"$@"}

#enronMailBoxForKeyword

 #! /bin/sh
 enronEmailsForKeyword ${1+"$@"} | xargs -n+1 convertEnronEmail

#enronThreadForKeyword

 #! /bin/sh
 enronEmailsForKeyword ${1+"$@"} | xargs cat

TimeSummer: new logo and some new features   01 Mar 06
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I managed to work a bit this weekend on TimeSummer. Timesummer is a simple RoR timesheet application.

A big thanks to Andreas for the new logo.

The logo reminds me of the "Blub Blub Spinat advertisement by Verona Feldbusch", but you probably do not understand that joke if you are not German :-).

New features:

  • Simple Excel export
  • Simple adding of historic data
  • Simple editing of existing data

The focus right now is on bug fixing and improving the design before we continue to add more features.

As usual enjoy it and make sure you send me any feedback, esp. bugs and wishes.

Active RBAC   28 Feb 06
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ActiveRBAC is a library for Ruby On Rails that provides a full stack for managing users and permissions. It runs as a Rails Engine and can be set up within minutes for your existing Rails projects.

 

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