mhermans

OpenCPU: pushing R for webbased, collaborative data analysis

Introduction

OpenCPU is the early stages PhD-project of Jeroen Ooms under supervision of Jan de Leeuw at the UCLA. Its buzzwordy tagline "Scientific computing in the cloud" captures it partially, but does not do it justice.

Most notable is that the entire architecture is truly open, not only the software level but also on the API and practical level. I.e. you can download the AGPL-licensed server as a Debian/Ubuntu-package and run your own instance. In addition to that, all interactions with the server take place through a cleanly designed REST-interface and you can execute all standard R-code, including your own.

This level of practical openness is very relevant, as a FOSS-licenced product can still generate a stale software ecosystem around it and practical lock-in due to specific protocols, customized commands, etc.

mhermans

library(sp)
library(plyr)
library(spdep)
library(igraph)

#load(url("http://www.filefactory.com/file/778ibc72fct3/n/BEL_adm3_RData"))
load(url("http://www.filefactory.com/file/4gkfr4n087l1/n/BEL_adm4_RData"))

area <- function(polygon) {
  polygon[1]@area

mhermans

* http://www.jstor.org/stable/10.1086/231292
* http://www.mhermans.net/blog/2010/12/freebase-bel20-directorates
* http://www.nbb.be/pub/03_00_00_00_00/03_02_00_00_00/03_02_01_00_00.htm?l=nl
* Neo4j, mongoDB
* http://www.mhermans.net/files/tmp/export/seadragon.html

mhermans

#!/bin/bash

FROM=$1 #/cygdrive/c/temp/oldrepo
TO=$2  #/cygdrive/c/temp/newrepo

echo "Spliting '$TO' from '$FROM'"
git clone --no-hardlinks $FROM $TO
cd $TO
git filter-branch --subdirectory-filter $TO HEAD -- --all
git reset --hard

mhermans

#!/usr/bin/env python
import datetime, os, json

# Write upcoming Tvheadend recording start dates to Synology power scheduler
# i.e. turn on your Synology so Tvheadend can record.
# Usage: ./pvr_poweron.py > /etc/power_sched.conf (or use cron)

# location of Tvheadend PVR-schedule files:
PVR_DIR="/usr/local/tvheadend/var/dvr/log"
# Day-code constants for power scheduler Monday-Sunday:

mhermans

{
 "metadata": {
  "name": "Python Tricks"
 },
 "nbformat": 3,
 "nbformat_minor": 0,
 "worksheets": [
  {
   "cells": [
    {

mhermans

# Source: getschema.org/microdataextractor?url=http://www.edamam.com/recipe/twentieth-century-cocktail-d0ecdc3a25d659e50177c42b3a3bc150&out=n3

@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>.

@prefix schema: <http://schema.org/>.

<_:gs0>
	rdf:type <http://schema.org/Recipe>;
	schema:name "Twentieth Century Cocktail";
	schema:url <http://www.saveur.com/article/Recipes/Classic-20th-Century-Cocktail>;

mhermans

// ==UserScript==
// @name     dwm-filter
// @include  http://www.dewereldmorgen.be/artikels/*
// @require  http://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js
// @description example script demonstrating how to automagically hide DWM comments of certain users, 
// ==/UserScript==

// select all comments based on author href attribute
var comments = $('a[href$="/people/mohamed-talhaoui"]');

mhermans

#!/var/packages/python/target/bin/python

import cgitb, os, time, urllib2, datetime

cgitb.enable()
TIME_WAIT = 10 # neem aan dat dit seconden zijn?
STAT_FILE = "RECORDING"

class Recorder(object):

mhermans

[mhermans@web314 ~]$ cat setvar.sh
#!/bin/bash
export CUSTOMVAR=test_env_var
[mhermans@web314 ~]$ cat readvar.py
#!/usr/bin/env python
import os
print os.environ['CUSTOMVAR']
[mhermans@web314 ~]$ env | grep CUSTOMVAR
[mhermans@web314 ~]$ source setvar.sh
[mhermans@web314 ~]$ env | grep CUSTOMVAR