emacs + erlang 세팅

https://github.com/massemanet/erlware-mode

하노이 타워

#lang racket
(define (hanoitower disc src aux dst)
  (cond
    [(> disc 0)
     (hanoitower (- disc 1) src dst aux)
     (displayln (format "Move ~s from ~s to ~s"disc src dst))
     (hanoitower (- disc 1) aux src dst)]))

(hanoitower 3 1 2 3)

emacs 컬럼모드

http://kb.iu.edu/data/afhg.html

C-spc 로 선택후

맨 마지막의 컬럼을 가서 

M-x kill-rectangle 

List max size

fastutil이 뭔가 궁금해서 찾아보다가. 
collection util 관련 내용도 찾아봤습니다.

1.
http://b010.blogspot.kr/2009/05/speed-comparison-of-1-javas-built-in.html

2.
http://stackoverflow.com/questions/629804/what-is-the-most-efficient-java-collections-library

Generally, a List implementation can hold any number of items (If you use an indexed List, it may be limited to Integer.MAX_VALUE or Long.MAX_VALUE). As long as you don't run out of memory, the List doesn't become "full" or anything. 
링크에 이런 말이 있네요. 
2^31-1 개 만큼 list 를 담을 수 가 있어서 이 이상의 데이터는 리스트에 못 담네요. 

그래서 위의 fastutil에서 int[][] 이렇게 해서 64bit에서 된다는 건가요? ^^;;

http://stackoverflow.com/questions/3767979/how-many-data-a-list-can-hold-at-the-maximum

http://stackoverflow.com/questions/7632126/maximum-size-of-hashset-vector-linkedlist

http://stackoverflow.com/questions/3038392/do-java-arrays-have-a-maximum-size

http://stackoverflow.com/questions/816142/strings-maximum-length-in-java-calling-length-method

http://fastutil.di.unimi.it/docs/it/unimi/dsi/fastutil/BigArrays.html

haskell monad

http://stackoverflow.com/questions/2704652/monad-in-plain-english-for-the-oop-programmer-with-no-fp-background/2704795#2704795

errai 에서 제공하는 client -server 방식

1. 기본적으로 comet을 이용한 MessageBus로 구현이 되어 있다.
1. Messages can be received asynchronously and arbitriraily by declaring callback services within the client bus. As ErraiBus maintains an open COMET channel at all times, these messages are delivered in real time to the client as they are sent. This provides built-in push messaging for all client service
2. websocket이 지원이 되면 Errai Bus가  comet이 아닌 WebSocket을 이용한다.
1. ErraiBus has support for WebSocket-based communication. When WebSockets are enabled, capable web browsers will attempt to upgrade their COMET-based communication with the server-side bus to use a WebSocket channel

출처 : http://docs.jboss.org/errai/2.2.0.CR1/errai/reference/html_single/#sid-5931280_MessagingAPIBasics-SendingMessageswiththeClientBus

unbuntu에서 R 셋업방법

sudo apt-get install r-base

emacs 2.4 셋업

ess 설치 : ess란 emacs에서 통계관련 툴을 도와주는 패키지

• emacs 실행  후 M-x package-install ess
• 또는 sudo apt-get install ess

R 실행 

• M-x R
• starting data directory? [시작할 디렉토리]

자동완성

• Shift -  : <-
• Tab : 자동완성