Takatomo Torigoe piyo7

piyo7 / TBool.scala

Last active August 29, 2015 14:07

コンパイル時に型レベルで整数を四則演算してみた ref: http://qiita.com/piyo7/items/1216ad44cae2b2aacece

	import scala.language.higherKinds

	sealed trait TBool {
	type Not <: TBool
	type And[A <: TBool] <: TBool
	type Or[A <: TBool] <: TBool
	type If[Then <: T, Else <: T, T] <: T
	}

	class TTrue extends TBool {

piyo7 / file0.ml

Last active August 29, 2015 14:07

Scalaにおけるバリアント型の表現 ref: http://qiita.com/piyo7/items/e57cf08bbfd7557303d2

	(* Binary tree with leaves carrying an integer. *)
	type tree = Leaf of int \| Node of tree * tree

	let rec exists_leaf test tree =
	match tree with
	\| Leaf v -> test v
	\| Node (left, right) ->
	exists_leaf test left
	\|\| exists_leaf test right

piyo7 / HelloUniverse.scala

Last active August 29, 2015 14:07

Scalaのリフレクションでメソッド一覧をテキスト出力 ref: http://qiita.com/piyo7/items/0218c01b6cd524326908

	object HelloUniverse extends App {

	implicit class RichList[T](self: List[T]) {
	def mkStringIfNonEmpty[T](start: String,
	seq: String,
	end: String): String =
	if (self.nonEmpty) self.mkString(start, seq, end)
	else ""
	}

piyo7 / file0.cpp

Last active August 29, 2015 14:07

指定したキーでソートするstd::sort ref: http://qiita.com/piyo7/items/e23670cd89502680649c

	std::sort(idols.begin(), idols.end(),
	[](const Idol& lhs, const Idol& rhs){ return lhs.production_id < rhs.production_id; });

piyo7 / KMeansIris.scala

Last active August 29, 2015 14:07

Spark / MLlib の K-means を Scala から利用してみる ref: http://qiita.com/piyo7/items/77cc4350bfeab75a29e7

	import org.apache.spark.SparkContext
	import org.apache.spark.mllib.clustering.KMeans
	import org.apache.spark.mllib.linalg.Vectors

	object KMeansIris extends App {
	val context = new SparkContext("local", "demo")

	val data = context.
	textFile("src/main/resources/iris.data").
	filter(_.nonEmpty).

piyo7 / FFT.scala

Last active August 29, 2015 14:07

Scalaで高速フーリエ変換の簡易実装 ref: http://qiita.com/piyo7/items/d942c6e15c988bb5fa9f

	object FFT extends App {
	import breeze.linalg.DenseVector
	import breeze.math.Complex

	def fft(f: DenseVector[Complex]): DenseVector[Complex] = {
	require(
	(f.size == 0) \|\|
	math.pow(2, (math.log(f.size) / math.log(2)).round).round == f.size,
	"size " + f.size + " must be a power of 2!")

piyo7 / file0.cpp

Last active August 29, 2015 14:06

boost::optionalにモナドのbindを ref: http://qiita.com/piyo7/items/6871e6fe0c4fb9198349

	#include <iostream>
	#include <type_traits>
	#include <boost/optional.hpp>

	template <
	typename Input,
	typename Functor,
	typename OptionalOutput = typename std::result_of<Functor(Input)>::type
	>
	OptionalOutput operator >>= (

piyo7 / file0.cpp

Last active August 29, 2015 14:06

変換先のstd::vectorを作って返すstd::transform ref: http://qiita.com/piyo7/items/c2f7a69e36b50313a074

	#include <algorithm>
	#include <iostream>
	#include <type_traits>
	#include <vector>

	template <
	typename Input, // 引数から推論されるので省略可
	typename Functor, // 引数から推論されるので省略可
	typename Output = typename std::result_of<Functor(Input)>::type
	>

piyo7 / build.properties

Created July 19, 2014 02:14

Simple Hatebu Parser for Atom (XML)

sbt.version=0.13.2