Vincent Chu vincentchu

Founder @HomeVision. Past: Initialized Capital, Twitter, Posterous. Distant Past: Stanford (PhD, Applied Physics) and Harvard (AB, Physics/Math)

vincentchu / when_to_use_do.rb

Created June 27, 2011 22:04

	# For multi-line blocks, use do. E.g.:

	users.each do \|user\|
	user.name = "foo"
	user.save
	end

	# For single-line blocks, use {}
	users.each {\|user\| user.destroy }

vincentchu / smith-waterman.rb

Created June 23, 2011 05:50

Smith Waterman implementation in Ruby

	class Matrix

	IndexOverflow = Class.new(StandardError)

	attr_reader :dims, :nrows, :ncols

	def initialize(mm, nn)
	@dims = [mm, nn]
	@nrows = mm
	@ncols = nn

vincentchu / test_server.rb

Created May 28, 2011 05:02

Test sinatra + EventMachine

	require 'rubygems'
	require 'sinatra/base'
	require 'eventmachine'
	require 'logger'

	$logger = Logger.new(File.join(File.dirname(__FILE__), "development.log"))

	module TestEM
	def self.start
	if defined?(PhusionPassenger)

vincentchu / gist:991881

Created May 25, 2011 20:34

vincentchu / pop_quiz_asshole.rb

Created May 18, 2011 22:24

pop_quiz_asshole.rb

	begin
	raise "THIS IS WEIRD?"
	rescue ex
	puts "EX = #{ex.message}"
	end

	# => undefined local variable or method `ex' for main:Object (NameError)

vincentchu / histogram.rb

Created May 18, 2011 02:39

histogram.rb

	#!/usr/bin/ruby


	binwidth = ARGV[0].to_f
	filename = ARGV[1]
	rand_file_name = "rand_file-#{(rand*1000000).to_i}.data"

	nums = File.open(filename, "r") {\|f\| f.readlines}.collect {\|n\| n.to_f }
	binned_data = {}
	nums.each do \|n\|

vincentchu / redis.rb

Created May 10, 2011 00:39

redis.rb

	require 'rubygems'
	require 'redis'
	require 'redis/distributed'

	redis = Redis::Distributed.new(['redis://localhost:6379', 'redis://localhost:6380'])

	(1..10_000).each do \|i\|

	key = "rand_#{rand}"
	val = rand(1000)

vincentchu / random_numbers_and_forking.rb

Created March 20, 2011 03:38

Using Ruby 1.8.7, let's take a look at how the random number generator behaves under forking

	[false, true].each do \|reseed_rand\|

	puts "" 100
	puts "Force reseed of the random number generator? #{reseed_rand}"
	2.times {
	fork {
	srand if reseed_rand
	puts sprintf(" Process ID: %5d, child of %5d: 3 Randoms: %.5f, %.5f, %.5f", Process.pid, Process.ppid, rand, rand, rand)
	}
	}

vincentchu / redis-tools vmstat

Created March 19, 2011 20:16

	--------------- objects --------------- ------ pages ------ ----- memory -----
	load-in swap-out swapped delta used delta used delta
	28 0 3742556 -43 10977293 -117 3.45G +101.54K
	28 0 3742517 -39 10977207 -86 3.45G +56.30K
	37 0 3742473 -44 10977107 -100 3.45G +65.12K
	29 0 3742433 -40 10976982 -125 3.45G +116.73K
	31 0 3742391 -42 10976850 -132 3.45G +78.88K
	30 0 3742351 -40 10976779 -71 3.45G +50.25K
	29 0 3742315 -36 10976673 -106 3.45G +426.68K
	30 0 3742271 -44 10976552 -121 3.45G +183.50K

vincentchu / redis.conf

Created March 19, 2011 19:59

Redis Conf

	daemonize yes
	pidfile /var/run/redis.pid
	port 6379
	timeout 30
	loglevel notice
	logfile /var/log/redis/redis-server.log
	databases 16

	################################ SNAPSHOTTING #################################
	save 300 1000