taisukeoe’s gists

taisukeoe / MyErrors.scala

Last active August 19, 2019 18:05

MonadErrorのコレクションに対し、Error値を蓄積しながらsequenceする（Applicative合成する)方法

	import cats.
	import cats.implicits._

	case class MyError(errorMsg: String)

	object MyError {
	implicit val s: Semigroup[MyError] = new cats.kernel.Semigroup[MyError] {
	override def combine(t1: MyError, t2: MyError): MyError = MyError(t1.errorMsg + "\n" + t2.errorMsg)
	}
	}

taisukeoe / readerT_sample.scala

Last active July 25, 2019 09:41

Reader[Future[X]]をうまく扱うためには、ReaderTでいいと思うよ (248回 rpscalaのフォローアップ)

	import cats._
	import cats.data.{Kleisli, Reader, ReaderT}
	import cats.implicits._

	import scala.concurrent.{ExecutionContext, Future}

	object ReaderStyle extends App {
	def someCalc(i: Int): Int = ???

	import ExecutionContext.Implicits.global

taisukeoe / ax_2.12.scala

Last active February 9, 2019 20:29

ax:A#X = a.x

	Welcome to Scala 2.12.8 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_201).
	Type in expressions for evaluation. Or try :help.

	scala> trait A {val x:AnyRef = null;type X = x.type}
	defined trait A

	scala> val a = new A{}
	a: A = $anon$1@36417a54

	scala> val ax:a.type#X = a.x

taisukeoe / 201607.md

Last active July 20, 2016 13:03

多相な関数の定義から学ぶ、型クラスデザインパターン

#多相な関数の定義から学ぶ、型クラスデザインパターン

　　　　　　　　　twitter: @OE_uia github: taisukeoe

##多相な関数

taisukeoe / cofreeEqual.scala

Last active May 11, 2016 03:29

CofreeEqual with Implicit Function Types?

	```scala
	implicit def cofreeEqual[A, F[_]](implicit A: Equal[A], F: Equal[F[Cofree[F, A]]]): Equal[Cofree[F, A]] =
	Equal.equal{ (a, b) =>
	A.equal(a.head, b.head) && F.equal(a.tail, b.tail)
	}

	scala> import scalaz._,Scalaz._
	import scalaz._
	import Scalaz._

taisukeoe / log.txt

Created January 12, 2016 18:09

ImageIO is not found in Android

	01-13 02:59:43.556 21402-21402/com.example.android.displayingbitmaps E/AndroidRuntime: FATAL EXCEPTION: main
	01-13 02:59:43.556 21402-21402/com.example.android.displayingbitmaps E/AndroidRuntime: Process: com.example.android.displayingbitmaps, PID: 21402
	01-13 02:59:43.556 21402-21402/com.example.android.displayingbitmaps E/AndroidRuntime: java.lang.NoClassDefFoundError: Failed resolution of: Ljavax/imageio/ImageIO;
	01-13 02:59:43.556 21402-21402/com.example.android.displayingbitmaps E/AndroidRuntime: at org.canova.image.recordreader.BaseImageRecordReader.<clinit>(BaseImageRecordReader.java:72)
	01-13 02:59:43.556 21402-21402/com.example.android.displayingbitmaps E/AndroidRuntime: at com.example.android.displayingbitmaps.ui.ImageGridActivity.trainMLP(ImageGridActivity.java:99)
	01-13 02:59:43.556 21402-21402/com.example.android.displayingbitmaps E/AndroidRuntime: at com.example.android.displayingbitmaps.ui.ImageGridActivity.onCreate(ImageGridActivity.java:72)
	01-13 02:59:43.556 21402-21402/com.examp

taisukeoe / projection.scala

Last active September 2, 2015 05:09

Row wise operations got weired

	scala> val ndArray = (1d to 8d by 1).mkNDArray(Array(2,2,2),NDOrdering.C)
	ndArray: org.nd4j.linalg.api.ndarray.INDArray =
	[[[1.00,2.00]
	[3.00,4.00]]
	[[5.00,6.00]
	[7.00,8.00]]]

	scala> ndArray.sliceP.map(s => s.rowP.map(r => r*r))
	res12: org.nd4j.linalg.api.ndarray.INDArray =
	[[[1.00,2.00]

taisukeoe / scalaz-streams-Task-es.scala

Last active August 29, 2015 14:26

scalaz-streamsのTask.startは、既存のTaskの実行Threadも変更できそう

	import streams._
	import util._
	implicit val s = Strategy.fromExecutionContext(scala.concurrent.ExecutionContext.Implicits.global)
	val t = Task(println(Thread.currentThread.getName))

	// Exiting paste mode, now interpreting.

	import streams._
	import util._
	s: streams.util.Strategy = streams.util.Strategy$$anon$1@60d8175

taisukeoe / callback2func.scala

Last active August 29, 2015 14:25

Break down Callback which has two ore more functions into the same number of PartialFunction

	trait Callback{
	def onSet(s:Set[String]):Unit
	def onList(l:List[String]):Unit
	}
	def funcWithCallback(s:String,callback:Callback):Unit = ???

	def funcAsFuture(s:String):Future[Traversable[String]] = {
	val p = Promise[Traversable[String]]()
	val f = p.future
	funcWithCallback(s,new Callback{

taisukeoe / build.sbt

Created April 20, 2015 14:21

FizzBuzzのbench

jmhSettings

Taisuke Oe taisukeoe