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    I'm trying to define some structure like this case class Transformer[From, To]( name: String, get: ... .flatMap(new filterName(names)) See Question&Answers more detail:os...
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    class TestClass[T](val x: T) { def +(other: TestClass[T]) = x + other.x } this definition gives me ... parameter and use addition in Scala?? See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    I'm trying to remove the scrollbars in a javafx webview. Search on forums, the suggestion is to make them invisible ... in Scala code. Thanks! S See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    Presenting here before possibly filing a bug. I'm using Spark 1.6.0. This is a simplified version of the ... behaviour? If expected, why? See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    I want to create a hashmap to store parameters names and their values. The parameters however are with different ... better way to store pair? See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    I am trying a write a file to hdfs using scala and I keep getting the following error Caused by: org.apache.hadoop. ... I do to make this work? See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    I have a SBT build where the tests create temporary files into a directory called temp. How can I tell SBT to ... when I call the clean task? See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    Why can't i define a variable recursively in a code block? scala> { | val test: Stream[Int] = 1 #:: ... a compilation error in a code block. See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    Is there a way to reference Spark DataFrame columns by position using an integer? Analogous Pandas DataFrame operation ... at column position 0 See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    I get different behaviour in 2.9.1 and 2.10 nightly -- what changed? Welcome to Scala version 2.9.1.final (OpenJDK ... => List(x, -x)) flatten See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    As part of sbt-assembly I want to include both src and test class files in jar. Sbt-assembly includes only ... test classes also in same jar? See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    E.g. i want to compose stream of 1, 2, 3 and 4, 5 in single one, so result should be: 1, 2, ... with datetime included, but with same result. See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    I'd like to use val ratings = data.map(_.split(',') match { case Array(user,item,rate) => Rating(user. ... How can i do to solve the problem? See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    Is it possible to use Option[_] member in a case class used with Dataset API? eg. Option[Int] I tried ... class outside of the Main function. See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    Why can I write val flat: List[Int] = List(Some(1), Some(2)).flatMap(i => i) But not val flat: List[Int] = List(Some(1), Some(2)).flatMap(_) See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    RDD has a very useful method aggregate that allows to accumulate with some zero value and combine that across partitions. ... ? Thanks a lot! VK See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    We have a project with several subprojects which can compile under both Scala 2.10 and 2.11, one subproject ... and still avoid this problem? See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    We're trying to submit a spark job (spark 2.0, hadoop 2.7.2) but for some reason we're receiving a ... we resolve it? We're pretty stumped. See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    I built random forest models using ml.classification.RandomForestClassifier. I am trying to extract the predict ... or solutions. Thanks! See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    I have List[Double], how to convert it to org.apache.spark.sql.Column. I am trying to insert it as ... .withColumn() to existing DataFrame. See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    I have experienced a problem with SBT loading in a local CSV file. Basically, I've written a Spark program ... under home/projects directory). See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    When I run code like: setUp( scenario1.inject(constantUsersPerSec(1) during (1 second)), scenario2.inject( ... it one by one? See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    To have a database available in scalatest with evolutions I use this extension of the default PlaySpec inspired by this SO ... 10 and Slick 3.1. See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    Is there a way to overload methods in Scala that take multiple parameter lists? E.g. I'd like to do this ... in some cases, for example. See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    I am trying to read Parquet files without using Apache Spark and I am able to do it but I am finding it ... I want to read specific columns. See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    I'm creating a series of webservices for my application and i have the need to access a different database ... to add a resource everytime? See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    I have been reading about Dotty, since it looks like it is about to become scala 3, and noticed that type ... cache the result in container } See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    Downloaded play-2.0 from type safe yesterday, following instructions as far as I can, but when I come to build ... on where to look... Thanks See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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