evanlh’s gists

evanlh / BloomFilter.java

Created May 7, 2011 03:14

	package katas.kata5;

	import java.io.BufferedReader;
	import java.io.IOException;
	import java.io.Reader;
	import java.security.MessageDigest;
	import java.security.NoSuchAlgorithmException;
	import java.util.BitSet;

	public class BloomFilter {

evanlh / decision_tree2.clj

Created February 24, 2013 21:38

Decision Tree Homework, first pass

	;; Begin Evan's attempt at section 11.3
	;; from http://www.doc.ic.ac.uk/~sgc/teaching/pre2012/v231/lecture11.html
	(def examples
	[{:weather :sunny, :parents :yes, :money :rich, :decision :cinema}
	{:weather :sunny, :parents :no, :money :rich, :decision :tennis}
	{:weather :windy, :parents :yes, :money :rich, :decision :cinema}
	{:weather :rainy, :parents :yes, :money :poor, :decision :cinema}
	{:weather :rainy, :parents :no, :money :rich, :decision :stayin}
	{:weather :rainy, :parents :yes, :money :poor, :decision :cinema}
	{:weather :windy, :parents :no, :money :poor, :decision :cinema}

evanlh / shannon-entropy-hw.md

Last active December 15, 2015 08:39

Entropy homework

Some observations about the entropy of bit sequences:

(seq-entropy '(0 0 0 0 1 1 1 1))
;; 1.0
(seq-entropy '(0 0 0 0))
;; 0.0

evanlh / entropy2.clj

Created April 10, 2013 02:30

	;; Response to https://gist.github.com/jackrusher/5289206
	;; Fill in this definition of seq-entropy that takes a second
	;; parameter that's the function that returns 'true' when a given item
	;; is positive.

	(defn seq-entropy
	"Calculate the entropy of sequence 'sq' assuming the all positive
	numbers represent positive samples."
	[sq pos-func]
	(let [len (count sq)

evanlh / entropy3.clj

Last active December 16, 2015 11:29

	;; Homework III

	;; first, some useful functions from the standard library...

	(frequencies [1 2 1 2 1 2 3 4 2 3 4 5])
	;; => {1 3, 2 4, 3 2, 4 2, 5 1}
	;; a convenience function that returns a map from each value in the
	;; input to the count of its occurence

	;; Evan, here's the python equivalent:

evanlh / Amplify test

Created April 12, 2014 18:04

	(ns amplifytest.core)

	(defn headerval [str]
	(let [intvals (map int (.getBytes str))
	len (count intvals)
	v (reduce + (map-indexed (fn [i x] (* (Math/pow 26 (- len 1 i)) (- x 64))) intvals))]
	(int v)))

	(defn -main [& args]
	(doseq [line (line-seq (java.io.BufferedReader. in))]

evanlh / layout.html

Last active August 29, 2015 14:25

	<!DOCTYPE html>
	<html lang="en" class="mdl-js"><head>
	<meta charset="utf-8">
	<meta http-equiv="X-UA-Compatible" content="IE=edge">
	<meta name="description" content="A front-end template that helps you build fast, modern mobile web apps.">
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<title>Material Design Lite</title>

	<!-- Add to homescreen for Chrome on Android -->
	<meta name="mobile-web-app-capable" content="yes">

evanlh / ThomasTest.js

Created August 21, 2015 17:50

	function Grid(M, N, mapFunction){
	this.grid = [];
	this.M = M;
	this.N = N;

	if (M < 1 \|\| N <1) throw new Error('Grid dimensions must be greater than 0');

	if (typeof mapFunction == 'function'){
	this.init(mapFunction);
	}

evanlh / kontor-test.js

Created September 14, 2015 02:55

	/**
	* Creates a new Cart object, with an optional pricing parameter.
	* @class
	* @param {object} pricing
	*/
	function Cart(prices){
	this.total = 0,
	this.pricing = {},
	this.contents = {};

evanlh / git and npm behind firewall.txt

Created October 26, 2015 21:56

	git config --global http.sslVerify false
	npm config set strict-ssl false

	~/.bowerrc
	{
	"directory": "bower_components",
	"registry": "http://bower.herokuapp.com",
	"strict-ssl": false
	}