Zhiping Yang ouyangzhiping

Building a beamer presentation with knitr.

Introduction

The documents included are the input for knitr. In addition you need to have the tool pandoc installed. I also use a custom beamer template to add the University of Utah \institute command to the template. It also changes the indentation some.

Steps

knit document with

Business Models

Advertising

Models	Examples
Display ads	Yahoo!
Search ads	Google

Backing up Postgres with Bash

Stop using Ruby to back up the postgres database in your Rails app. Use bash instead!

##Install:

cd /usr/local/bin
git clone https://gist.github.com/4552332.git db_backup

chmod +x db_backup/db_backup.sh

The range sliders at the top change the values for the force-directed algorithm and the buttons load new graphs and apply various techniques. This will hopefully serve as a tool for teaching network analysis and visualization principles during my Gephi courses and general Networks in the Humanities presentations.

Notice this includes a pretty straightforward way to load CSV node and edge lists as exported from Gephi.

It also includes a pathfinding algorithm built for the standard data structure of force-directed networks in D3. This requires the addition of .id attributes for the nodes, however.

Now with Clustering Coefficients!

Also, it loads images for nodes but the images are not in the gist. The code also refers to different network types but the data files on Gist only refer to the transportation network.

Zero downtime deploys with unicorn + nginx + runit + rvm + chef

Below are the actual files we use in one of our latest production applications at Agora Games to achieve zero downtime deploys with unicorn. You've probably already read the GitHub blog post on Unicorn and would like to try zero downtime deploys for your application. I hope these files and notes help. I am happy to update these files or these notes if there are comments/questions. YMMV (of course).

Other application notes:

Our application uses MongoDB, so we don't have database migrations to worry about as with MySQL or postgresql. That does not mean that we won't have to worry about issues with the database with indexes being built in MongoDB or what have you.
We use capistrano for deployment.

Salient points for each file:

Install Python

$ brew install readline sqlite gdbm
$ brew install python --universal --framework
$ python --version
Python 2.7

Symlinks...

	rm -rf threefoursix
	rails --version
	rails new threefoursix --skip-bundle

	cd threefoursix
	echo "gem 'surveyor'" >> Gemfile
	bundle install
	script/rails g surveyor:install

	"""
	Exports Issues from a specified repository to a CSV file

	Uses basic authentication (Github username + password) to retrieve Issues
	from a repository that username has access to. Supports Github API v3.
	"""
	import csv
	import requests

	#!/usr/bin/env ruby

	require 'mechanize'

	@username = USERNAME
	@password = PASSWORD
	@download_path = DOWNLOAD_PATH

	unless File.directory? @download_path
	puts "@{download_path} doesn't exist!"

	# Usage Example: $ ddl-confreaks rubyconf2012 ~/Downloads/
	# save it as /etc/profiles/ddl.confreaks.sh
	##
	## currently it checks for lowest resolution video mostly {640x360} and downloads it

	function ddl-confreaks(){
	if [ $# -ne 2 ];
	then
	echo 'Failed. Syntax: $> ddl-confreaks EVENT_NAME DOWNLOAD_PATH'
	return