Michael Cotterell mepcotterell

💭

I may be slow to respond.

I'm a Senior Lecturer in the UGA School of Computing. I like to explore the intersection of open science and computing education.

mepcotterell / DSL.scala

Created March 2, 2011 14:08

Here's a small example of how to extends types by giving them more operations in Scala.

	object DSL {
	implicit def MkDSLRichAnyOps[T](elem: T) =
	new DSLRichAny(elem)
	}

mepcotterell / Vec.scala

Created June 23, 2011 16:11

Here is an implementation of a generic, numeric vector in Scala that utilizes mixin compositions with context-bounded type parameters.

	package scalation
	package advmath

	object Vec {

	}

	class Vec [A: Numeric] extends VecLike[A, Vec[A]] {

	}

mepcotterell / ExponentiationApp.scala

Created September 21, 2011 01:41

Examples of Unicode Operators using the ScalaTion DSL

	object ExponentiationApp extends App with ScalaTion
	{
	val exp1 = 2 ↑ 2 // 4
	val exp2 = 2 ↑ 2 ↑ 2 // 16

	println("2↑2 = %s".format(exp1))
	println("2↑2↑2 = %s".format(exp2))
	}

mepcotterell / MyNum.scala

Created September 29, 2011 01:06

	case class MyNum (val d: Double) extends Numeric [MyNum]
	{
	def fromInt (n: Int) = MyNum (n)
	def + (rhs: MyNum) = plus(this, rhs)
	def plus (x: MyNum, y: MyNum): MyNum = MyNum (x.d + y.d)
	def minus (x: MyNum, y: MyNum): MyNum = MyNum (x.d - y.d)
	def times (x: MyNum, y: MyNum): MyNum = MyNum (x.d * y.d)
	def negate (x: MyNum): MyNum = MyNum (-x.d)
	def toInt (x: MyNum): Int = x.d.toInt
	def toLong (x: MyNum): Long = x.d.toLong

mepcotterell / Combo.scala

Created February 2, 2012 19:09

Combination Examples

	object Combo extends App {
	val vars = List("a", "b", "c", "d")
	val list = vars map (e => ("-%s".format(e), "+%s".format(e)))
	val len = list.size
	val combos = math.pow(2, len).toInt

	for (i <- 0 until combos) {
	for (j <- 0 until len) {
	val (off, on) = list(j)
	print ("%s ".format(if ((i >> j) % 2 == 0) off else on))

mepcotterell / demo1.results

Created February 15, 2012 05:45

Example SPARQL Queries

:Albert_Einstein :hasAcademicAdvisor :Alfred_Kleiner .

mepcotterell / Parens.scala

Created February 28, 2012 02:39

Balanced parentheses example.

	object Parens extends App {

	def balanced (input: String): Boolean = {
	val stack = collection.mutable.Stack.empty[String]
	import stack._
	for (i <- input) i match {
	case '(' => push("(")
	case '[' => push("[")
	case ')' => if (isEmpty) return false else if (pop() != "(") return false
	case ']' => if (isEmpty) return false else if (pop() != "[") return false

mepcotterell / fbpa.js

Created March 26, 2012 15:51

	google.load('visualization', '1', {'packages': ['geochart']});
	google.setOnLoadCallback(drawMarkersMap);

	function drawMarkersMap() {
	var data = new google.visualization.DataTable();
	data.addColumn('string', 'City');
	data.addColumn('number', 'Population');
	data.addColumn('number', 'Area');
	data.addRows([
	['Rome', 2761477, 1285.31],

mepcotterell / actor.rdf

Created April 2, 2012 15:21

Example RDF output of Sakila database.

	<http://johnson.cs.uga.edu/triplify/index.php/actor> <http://www.w3.org/2000/01/rdf-schema#comment> "Generated by Triplify V0.7.1 (http://Triplify.org)" .
	<http://johnson.cs.uga.edu/triplify/index.php/actor> <http://creativecommons.org/ns#license> <http://creativecommons.org/licenses/by/3.0/us/> .
	<http://johnson.cs.uga.edu/triplify/index.php/actor/1> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Actor> .
	<http://johnson.cs.uga.edu/triplify/index.php/actor/2> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Actor> .
	<http://johnson.cs.uga.edu/triplify/index.php/actor/3> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Actor> .
	<http://johnson.cs.uga.edu/triplify/index.php/actor/4> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Actor> .
	<http://johnson.cs.uga.edu/triplify/index.php/actor/5> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Actor> .
	<http://jo

mepcotterell / Schema.scala

Created September 7, 2012 12:46

TypeTags Example for Database Schema

	// NOT TESTED YET

	import scala.reflect.runtime.universe._

	class Schema[T : TypeTag](val attributes: String*) extends Dynamic {
	val length = attributes.length
	def selectDynamic[A: TypeTag](field: String): A.tpe = null
	def updateDynamic[A: TypeTag](field: String)(value: A.tpe) { }
	} // Schema