Winter brake 2011-2012

I take a winter brake, so I suspend posts and comments to this blog for a moment. Resume will be January 7, 2012.

I wish you a Merry Christmas and a Happy New Year.

Tips: Which are you using java command, JDK's or JRE's?

This is an easy tips. Which are you using java command, JDK's or JRE's? How do you recognize it? Let's type the command below:

> java -server -version
java version "1.7.0_02"
Java(TM) SE Runtime Environment (build 1.7.0_02-b13)
Java HotSpot(TM) 64-Bit Server VM (build 22.0-b10, mixed mode)

If succeed, that is JDK's , and if not, that is JRE's.

Qt 4.8.0 and QtCreator 2.4.0 have been released

In a few days, Qt Framework 4.8.0 and QtCreator 2.4.0 have been released. Since this release, Lighthouse project is finally integrated.

BigMath

Since Ruby 1.9.3, bigdecimal library has powered up. Especially, BigMath module is so.

irb(main):001:0> require 'bigdecimal/math'
=> true
irb(main):002:0> prec = 10
=> 10
irb(main):003:0> (-BigMath::PI(prec)).to_s
=> "-0.3141592653589793238462643388813853786957412E1"
irb(main):004:0> BigMath::exp(-BigMath::PI(prec), prec).to_s
=> "0.4321391826E-1"

But, unfortunately, bigdecimal library now does not support complex calculations:

irb(main):005:0> BigMath::exp(Complex(0, -BigMath::PI(prec)), prec)
ArgumentError: Complex can't be coerced into BigDecimal
        from (irb):5:in `exp'
        from (irb):5
        from c:/ruby-1.9.3/bin/irb:12:in `<main>'

Mono 2.10.7 for Mac has been released

A few days ago, Mono Framework 2.10.7 has been released only for Mac OS X. this release includes fixes for gtk related bug - e.g. Multi-byte characters are garbled on MonoDevelop. So that, since 2.10.7, we just install and use Mono and MonoDevelop without multi-byte font settings like phosphorescence: Modify the default font of Mono after 2.10.3.

Ignore case partially

It's easy to ignore case of whole word in regular expression. But How do we do ignore case partially? For example, matching with AbcD, abcD, Abcd and abcd, but not matching ABCD, aBCd and so forth.

In the Japanese edition of "Regular Expressions Cookbook", there are two approaches.

mode toggle "i"

In the page #28, surround the word to ignore between (?i) and (?-i):

/(?i)a(?-i)bc(?i)d(?-i)/

group with modifier "i"

In the page #76, use modifier "i" for the word to ignore:

/(?i:a)bc(?i:d)/

Start reading Regular Expressions Cookbook

I have started reading the Japanese edition of "Regular Expressions Cookbook".

The cover of English edition is below:

In earlier page, I encountered (?i) that I never knew until reading the Recipe 2.1 on this book.

Screenshot of Snippper

In my previous article, I introduced just a little bit about "Snapper". Now then I introduce these screenshots.

The first one is the screenshot about list of snapshots.

The second one is the screenshot about each snapshot.