Pablo Heredia crowl

Multi user nix installation

Each section should be run as the user or as root, pay attention to which one!

Install nix single user

As $USER

curl https://nixos.org/nix/install | sh

How-to setup a simple git push deployment

These are my notes basically. At first i created this gist just as a reminder for myself. But feel free to use this for your project as a starting point. If you have questions you can find me on twitter @thomasf https://twitter.com/thomasf This is how i used it on a Debian Wheezy testing (https://www.debian.org/releases/testing/)

Discuss, ask questions, etc. here https://news.ycombinator.com/item?id=7445545

On the server (example.com)

Description

This simple script will take a picture of a whiteboard and use parts of the ImageMagick library with sane defaults to clean it up tremendously.

The script is here:

#!/bin/bash
convert "$1" -morphology Convolve DoG:15,100,0 -negate -normalize -blur 0x1 -channel RBG -level 60%,91%,0.1 "$2"

Results

General Background and Overview

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=rep1&t

	; Postgres listen/notify in Clojure using http://impossibl.github.io/pgjdbc-ng/

	; in project.clj dependencies
	; [com.impossibl.pgjdbc-ng/pgjdbc-ng "0.5"]


	(ns pglisten.core
	(:import [com.impossibl.postgres.jdbc PGDataSource]
	[com.impossibl.postgres.api.jdbc PGNotificationListener]))

	package main

	import (
	"fmt"
	"github.com/alexedwards/stack"
	"github.com/julienschmidt/httprouter"
	"net/http"
	)

	func main() {

	// array utils
	// =================================================================================================

	const combine = (...arrays) => [].concat(...arrays);

	const compact = arr => arr.filter(Boolean);

	const contains = (() => Array.prototype.includes
	? (arr, value) => arr.includes(value)
	: (arr, value) => arr.some(el => el === value)

	The MIT License (MIT)

	Copyright (c) 2014 Tomas Kafka

	Permission is hereby granted, free of charge, to any person obtaining a copy
	of this software and associated documentation files (the "Software"), to deal
	in the Software without restriction, including without limitation the rights
	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	copies of the Software, and to permit persons to whom the Software is
	furnished to do so, subject to the following conditions:

	module Hedis
	(
	-- * Application classes
	HasRedis(..)
	-- * App-wrapped redis runner
	, redis
	-- * Re-export other stuff from "Database.Redis"
	, module R
	) where

	var WebSocketServer = require('ws').Server;
	var wss = new WebSocketServer({port: 8080});

	var jwt = require('jsonwebtoken');

	/**
	The way I like to work with 'ws' is to convert everything to an event if possible.
	**/
	function toEvent (message) {
	try {