David Novakovic dpnova

This cheat sheet originated from the forum, credits to Laurent Poulain. We copied it and changed or added a few things.

Evaluation Rules

Call by value: evaluates the function arguments before calling the function
Call by name: evaluates the function first, and then evaluates the arguments if need be

    def example = 2      // evaluated when called
    val example = 2      // evaluated immediately

A simple linear regression test with Math.js using normal equations solution (based on Coursera's Machine Learning Course). You can view the interpolated values moving the mouse over the calculated line.

Run "bower install" and watch the console output.

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

	<!--
	* Copyright (c) 2021 GraphQL Contributors
	* All rights reserved.
	*
	* This code is licensed under the MIT license.
	* Use it however you wish.
	-->
	<!DOCTYPE html>
	<html>
	<head>

	val uri = "http://www.yahoo.com"
	val reqEntity = Array[Byte]()

	val respEntity = for {
	request <- Marshal(reqEntity).to[RequestEntity]
	response <- Http().singleRequest(HttpRequest(method = HttpMethods.POST, uri = uri, entity = request))
	entity <- Unmarshal(response.entity).to[ByteString]
	} yield entity

	val payload = respEntity.andThen {

	# vim: set fileencoding=utf8
	'''
	References
	- http://stackoverflow.com/a/1966188
	- http://en.wikipedia.org/wiki/Tree_(data_structure)

	$ python suggest.py prefix
	'''
	import sys
	import redis

	"""
	A simple configuration file.
	"""
	cache = True
	debug = True

	import sys, os, glob
	from datetime import datetime

	sys.path.append(os.environ.get("MAHOUT_CORE"))
	for jar in glob.glob(os.environ.get("MAHOUT_JAR_DIR") + "/*.jar"):
	sys.path.append(jar)

	from org.apache.mahout.common import RandomUtils
	from org.apache.mahout.cf.taste.common import TasteException
	from org.apache.mahout.cf.taste.eval import *

	import simplejson as json
	import lxml

	class objectJSONEncoder(json.JSONEncoder):
	"""A specialized JSON encoder that can handle simple lxml objectify types
	>>> from lxml import objectify
	>>> obj = objectify.fromstring("<Book><price>1.50</price><author>W. Shakespeare</author></Book>")
	>>> objectJSONEncoder().encode(obj)
	'{"price": 1.5, "author": "W. Shakespeare"}'
	"""