Martin Czygan miku

OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.

To capture the video (filesize: 19MB), using the free "QuickTime Player" application:

#System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

##Basic Steps

User cases (description of sequences of events that, taken together, lead to a system doing something useful)
- Who is going to use it?
- How are they going to use it?

Probabilistic Data Structures for Web Analytics and Data Mining : A great overview of the space of probabilistic data structures and how they are used in approximation algorithm implementation.
Models and Issues in Data Stream Systems
Philippe Flajolet’s contribution to streaming algorithms : A presentation by Jérémie Lumbroso that visits some of the hostorical perspectives and how it all began with Flajolet
Approximate Frequency Counts over Data Streams by Gurmeet Singh Manku & Rajeev Motwani : One of the early papers on the subject.
[Methods for Finding Frequent Items in Data Streams](http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.187.9800&rep

+# Add field
+echo '{"hello": "world"}' | jq --arg foo bar '. + {foo: $foo}'
+# {
+#   "hello": "world",
+#   "foo": "bar"
+# }
+# Override field value
+echo '{"hello": "world"}' | jq --arg foo bar '. + {hello: $foo}'
+{

	#!/usr/bin/env python
	"""
	xlsx2tsv filename.xlsx [sheet number or name]

	Parse a .xlsx (Excel OOXML, which is not OpenOffice) into tab-separated values.
	If it has multiple sheets, need to give a sheet number or name.
	Outputs honest-to-goodness tsv, no quoting or embedded \\n\\r\\t.

	One reason I wrote this is because Mac Excel 2008 export to csv or tsv messes
	up encodings, converting everything to something that's not utf8 (macroman

	# Greatest common divisor of more than 2 numbers. Am I terrible for doing it this way?

	def gcd(*numbers):
	"""Return the greatest common divisor of the given integers"""
	from fractions import gcd
	return reduce(gcd, numbers)

	# Least common multiple is not in standard libraries? It's in gmpy, but this is simple enough:

	def lcm(*numbers):

	#!/bin/sh
	## Information
	## http://carlo-hamalainen.net/blog/2007/12/11/installing-minion-pro-fonts/
	## http://www.ctan.org/tex-archive/fonts/mnsymbol/

	## 0: Install
	## http://www.lcdf.org/type/
	## I used --without-kpathsea to configure (with MacTeX 2011):
	##
	## ./configure --without-kpathsea

	package trie

	import (
	"container/vector"
	"sort"
	)

	// A 'set' structure, that can hold []byte objects.
	// For any one []byte instance, it is either in the set or not.
	type Trie struct {

	// Traverses an arbitrary struct and translates all stings it encounters
	//
	// I haven't seen an example for reflection traversing an arbitrary struct, so
	// I want to share this with you. If you encounter any bugs or want to see
	// another example please comment.
	//
	// The MIT License (MIT)
	//
	// Copyright (c) 2014 Heye Vöcking
	//

	// packageList returns the list of packages in the dag rooted at roots
	// as visited in a depth-first post-order traversal.
	func packageList(roots []Package) []Package {

	seen := map[*Package]bool{}
	all := []*Package{}
	var walk func(*Package)
	walk = func(p *Package) {
	if seen[p] {
	return