Set NetBeans interface back to US English

I use Mac OS X in Japanese, but I like most of my development tools run in English. I upgraded my NetBeans today to 6.7 and it detects my OS language and NetBeans showed up in Japanese. http://blogs.sun.com/tao/entry/set_netbeans_user_interface_language The fix mentioned in the page above worked for me. On OS X, the netbeans.conf file is in /Applications/NetBeans 6.7.app/Contents/Resources/NetBeans/etc/netbeans.conf

Blue biting flower is...

I didn't know this plant's name, but it flowers now. As blue flowers with a black stem is pretty unique, I felt I can tell now. The flower looks like biting something!

With a little bit of search, I could find the name of the plant. I believe it is Salvia guaranitica.

Gnucash said "This account register is read-only."

When I started up GnuCash, I saw a dialog box saying "This account register is read-only".

This account may not be edited. If you want to edit transactions in this register, please open the account option and turn off the placeholder checkbox.

The error message is not good because it is not obvious that what "This account" mean. A post on Gmane (originally posted comp.gnome.apps.gnucash.user newsgroup) explains it. http://article.gmane.org/gmane.comp.gnome.apps.gnucash.user/24490

superclass mismatch for class Item

I had an "superclass mismatch for class Item" when I ran rake db:migrate. It was because I defined the same class twice. The model class is Item and I happened to have another class Item in my migration.

mir% grep -R 'class Item' .
./test/unit/item_test.rb:class ItemTest < Test::Unit::TestCase
./app/models/item.rb:class Item < ActiveRecord::Base
./db/migrate/20090325060057_item.rb:class Item < ActiveRecord::Migration

I changed the class name in 20090325060057_item.rb from Item to AlterItem, but this was not enough. This gives me rather hard to corelate error message:

undefined method `migrate' for Item(id: integer, created_at: datetime, updated_at: datetime):Class
/usr/lib/ruby/gems/1.8/gems/activerecord-2.2.2/lib/active_record/base.rb:1833:in `method_missing_without_paginate'
/usr/lib/ruby/gems/1.8/gems/mislav-will_paginate-2.3.8/lib/will_paginate/finder.rb:170:in `method_missing'

It turned out that it was caused by filename and class name mismatch. I had to change the filename to 20090325060057_alter_item.rb to match with AlterItem class name.

Decluttered My Desk

It is hard to say whether I am an organized person or not. I am fairly meticulous about details, but my desk ended up like this recently.

送信者 for gacooh

Originally, I was thinking of adjusting the height of the desk and considering to replace my office desk. My research was to use Flickr to get ideas by searching "office desk" tags. I came across a very clean desk with a computer.

CC by tomas carrillo

A blog post refers another attempt: "Declutter Your Desk by Van Mardian". It looked like a doable and cheap solution to me. So, I decided to do it as my weekend project (and I forgot the original attempt of buying a new desk!).

The cable mess

I've purchased a peg board, cable ties, and shackles from OSH and Home Depot, and put most of the devices to the peg board. Physical work wasn't hard, but figuring out an suitable layout was. My first attempt was not optimal but I just line the devices up and it worked out okay. It has two cable taps, a cable modem, a wifi router, a network hub, a skype phone base, two external hard drives, an usb hub, and a usb audio output.

送信者 for gacooh

I flipped the desk back and connected a bunch of cables, and it looks quite well. The USB hub and audio jack are accessible from the front.

送信者 for gacooh

送信者 for gacooh

Most of the clutters were just needed to be cleaned up, but there were also a couple of things on the desk such as an USB audio, external hard drives, and an USB hub. They actually made the desk look cluttered even if I cleaned up. I'm satisfied with the improvement. There are still things under the desk and it is clear that they needs to be tidied up. It sounds a lot easier task as most of the stuff has been already handled.

送信者 for gacooh

送信者 for gacooh

attr_accessor is a method

Somehow I thought the action of defining a class is an declaration and doesn't execute statements, but I was wrong.

class MyClass
  put "Hello world"
  def MyMethod
    puts "output from MyMethod"
  end
end

The Ruby code above actually spits "Hello world". I tried this with Python and Python did the same. The reason I wondered this was Ruby's attr_accessor.

class MyClass
  attr_accessor :a
end

It looked to me like an declaration of @a to have accessors, but it isn't. attr_accessor is an method implemented in Module class and it is not a reserved word. The truth is that attr_accessor is executed when the source code is interpreted and it defines accessor methods. AH!

Energy Saving

When I received the first PG&E bill after I moved into the current house, I was shocked with the amount. Electricity was $243.58.

I am not an avid environmentalist, but it became so clear that I wanted to save the earth, eh, $$$. And it is a good game for an engineer because it is clearly measurable.

The baseline was 34.65Kwh/day. The game was started with replacing light bulbs to compact fluorescent lamp (CFL) bulbs. The technology was far more advanced than I thought and the color is like regular light bulbs and there's even dimmer-able ones. These CFLs requires roughly 1/5 of electricity for the same brightness. The only drawback is the slow warm-up. It takes a minute or so to reach the full brightness. There are white LED lights which is even better and it only consumes a few watts, but they are still too-white, dark, and expensive.

Switching to these CFLs saved 6Kwh or so a day. The family room had eaten the most and kitchen was the next.

However, last two months or so, I couldn't bring it down further. I was wondering what was eating that much electricity. It turned out that there was lights in my backyard. Again, these were halogen lights. While it is nice to light up, I really don't see outside much at night, I just decided to turn them off completely. Result? It was great. It shelved another 3.8Kwh/day.

It actually brought the daily electricity cost by 47% to $104.79 while the electricity usage was down by 31%. The reason was electricity's heavy progressive cost structure.

Baseline usage (415.8 Kwh) @ $0.11536

101-130% (124.74 Kwh) @ $0.13115

131-200% (291.06 Kwh) @ $0.24711

200%-300% @ $0.35432

If you use more than twice as the baseline, your electricity is more than 3x expensive. Actually, the gas's cost structure is not as steep as electricity, you may want to use gas appliances over electricity ones. In my personal experience, electric heater was worse than gas furnace, and I am glad that I bought a gas dryer.

The next target is going to be lighting in bathrooms.

How to overcome the boring Internet?

I wrote a blog post on how to find interesting things on the internet while back in Japanese. My argument was "don't use sites like Digg". Following what many people like is reasonably fun, but it doen't satisfy you fully. In the post, I said that I found it better to search on a random topic which you are interested in. Although I said that, I sometimes see myself still visiting Digg, a Japanese social bookmark site, various news sites, and Google reader and read through all the new stuff and I was still not satisfied (this is what I said what was going to happen). I thought about why I did this instead of doing searches. It seems that it was hard to find a good keyword to start with. It requires some brain power. Once I found A keyword, following queries are easily following, but finding the first one is actually tough. So, I thought about how to come up with the first search keyword. I think I reached to a conclusion for myself: "use del.icio.us". I have been using del.icio.us to bookmark pages which I found useful. There's no single topic on my interests and my delicious bookmarks scatter across train, graphic design, programming, and bicycle. When I need to come up with the first keyword, my past bookmarks become a good starting point. I can continue a research on the last topic. I stopped digging for some reason (felt sleepy, needed to go out), but usually not because of completely satisfying myself. The information on the Internet is bottomless. Or, I can randomly click a tag to see what I bookmarked. It allows me to pick a path of Today's expedition. The topics are always relavent to you because all the content was prepared by yourself.

Rails app deployment

I have written a few Rails applications, but I couldn't have implemented anything useful for my day-to-day use. At least one of these applications I wrote seems usable, but I found Rails app deployment was the blocking factor. I wrote a very simple app and just focused on Rails app deployment today. It turned out that there are enough things to overcome and that's why I couldn't complete my projects.

Picking a production configuration

It is nice for Rails to have easy-to-use application servers such as Mongrel or Webrick. For a low traffic site like mine, it should be okay in terms of performance. However, I have existing python CGIs and contents may not run. I need to create a hybrid envornment to serve both legacy CGIs and new Rails apps. There are a bunch of possibilities, and I picked apache + Phusion Passenger because 1) the existing site runs apache and 2) it seems to be one of the good choices in 2008-2009.

Phusion Passenger installation on Gentoo Linux

Installation of Phusion Passenger was simple, but apache configuration was not. This is not Passenger's fault by the way. Passenger is an Apache loadable module. Apache needs to load it when it starts. Gentoo Linux stores module configurations in /etc/apache2/modules.d (not /etc/modules.d!). I created /etc/apache2/99_passenger_gaku_net.conf I had a couple of erros here and here's how I debugged.

• I had wrong PassengerRuby path. Passenger didn't spit error. Just type the Ruby path and make sure it runs a Ruby interpretor.
• Use PassengerLogLevel directive for debugging. PassengerLogLevel 1
• I enabled Apache's /server-info handler by opening it up to everyone temporalily. To do this, modify /etc/apache2/modules.d/00_mod_info.conf. Then, http://www.gaku.net/server-info shows useful info on Apache, and it should have mod_passenger.c in the page when the module was properly loaded. (/server-info is turned off now).

Installing a Rails app

As I have existing content on my site, I decided to give /isbn to my test Rails app. Other URI will be served by existing configuration. It can be achieved by adding a following line in my vhost configution in /etc/apache2/vhost.d/.

RailsBaseURI /isbn

The filesystem directory /web/isbn needs to point the Rails app's public directory. I created a symboic link from my web directory. My error here was using a wrong directive. There is RukeBaseURI. I needed to use RailsBaseURI.

Bay Area OSM on my Garmin 60csx

I've been using an OSM map made by cloudmead for last couple of days, but it is hard to read under the sun, because streets are rendered in light gray. I've decided to generate one. I used the bounding box of bbox=-122.496,37.017,-121.807,37.84297 to cover most of the San Francisco Bay area. It roughly covers San Francisco to San Jose. It doesn't cover Northern part of the Bay area as I don't go there often.

wget -O down.osm http://www.informationfreeway.org/api/0.5/map?bbox=-122.496,37.017,-121.807,37.84297

The one above no longer works in 2010. Try the following one:

wget -O down.osm http://www.informationfreeway.org/api/0.6/map?bbox=-122.496,37.017,-121.807,37.84297

java -Xmx512M -jar mkgmap.jar --gmapsupp down.osm

The downloaded data was 168MB. .img file genereated by mkgmap is just about 3MB and it is quite impressive. The time to convert was only 30 secs or so.