scala：画图

build.sbt

name := "draw"

version := "1.0"

scalaVersion := "2.11.8"

libraryDependencies += "org.scalanlp" %% "breeze-viz" % "0.12"

Draw.scala

import breeze.linalg._
import breeze.plot._
object Draw {
    def main(args: Array[String]): Unit = {
        val a = new DenseVector[Int](1 to 3 toArray)
        val b = new DenseMatrix[Int](3, 3, 1 to 9 toArray)

        val f = Figure()  //在一个对话框下画一个图
        val p = f.subplot(0)
        val x = linspace(0.0, 2.0)
        
        p += plot(x, x :^ 2.0)
        p += plot(x, x :^ 3.0, '.')
        p.xlabel = "x axis"
        p.ylabel = "y axis"

        val p2 = f.subplot(2, 1, 1)   //在同一个对话框下画另一个图，参数分别表示：行、列、子图序号
        val g = breeze.stats.distributions.Gaussian(0, 1) //均值是0，标准差是1
        p2 += hist(g.sample(100000), 100)  //hist表示直方图，100000个样本点，100个条状直方
        p2.title = "A normal distribution"
        f.saveas("d:\\subplots.png")

        val f2 = Figure()
        f2.subplot(0) += image(DenseMatrix.rand(20, 20))
        f2.saveas("d:\\image.png")
    }
}

会保存并打开显示两个文件：
subplots.png

image.png