DenseVector卷积，如何。(Scala Breeze)

Question

天真的用户想要在Scala Breeze中做一个简单的卷积：

import breeze.linalg._
import breeze.numerics._
import breeze.signal.support.{OverhangOpt, CanConvolve} // ??

val kernel = DenseVector(1.0, 2.0)
val data   = DenseVector(2.0, 3.0, 4.0, 5.0)
val out    = data.convolve(kernel)

有没有人能写出一个如何做到这一点的小例子？

Answer 1

你已经在正确的道路上了。只需确保您安装了最新版本的breeze，即0.6-SNAPSHOT。例如，在build.sbt中使用以下部分

libraryDependencies ++= Seq(
        "org.scalanlp" % "breeze_2.10" % "0.6-SNAPSHOT"
    )

resolvers ++= Seq(
        "Sonatype Snapshots" at "https://oss.sonatype.org/content/repositories/snapshots/",
        "Sonatype Releases" at "https://oss.sonatype.org/content/repositories/releases/"
    )

不需要从breeze.signal.support导入东西，您的原始示例将很好地工作：

scala> import breeze.linalg._
import breeze.linalg._

scala> import breeze.signal._
import breeze.signal._

scala> convolve(DenseVector(1.0, 2.0), DenseVector(3.0, 4.0, 5.0, 6.0))
res1: breeze.linalg.DenseVector[Double] = DenseVector(10.0, 13.0, 16.0)