Experiment the performance Math.abs() and breeze.numerics.abs

gistfile1.md

Source Code by scalatest

class CheckPerformanceSuite extends FunSuite {
  test("check the performance") {
    var start = System.currentTimeMillis()
    val vectors = (1 to 3000000).map { i => Vectors.dense(Math.random(), -1 * Math.random(), Math.random())}
    var end = System.currentTimeMillis()
    println(s"Time for Creating: ${end - start}")

    start = System.currentTimeMillis()
    vectors.map(v => v.toBreeze.map(x => abs(x)))
    end = System.currentTimeMillis()
    println(s"Time for mapping breeze.numerics.abs: ${end - start}")

    start = System.currentTimeMillis()
    vectors.map(v => v.toBreeze.map(x => Math.abs(x)))
    end = System.currentTimeMillis()
    println(s"Time for mapping Math.abs: ${end - start}")
  }
}

Result

Time for Creating: 2049
Time for mapping breeze.numerics.abs: 4025
Time for mapping Math.abs: 2561