Question

How to calculate the dot product of two arrays in Scala

Answer 1

object CalculateDotProductOfTwoArrays_Scala {
  private def calculateDotProduct(arr1: Array[Int], arr2: Array[Int]): Int = {
    (arr1 zip arr2).map { case (a, b) => a * b }.sum
  }

  def main(args: Array[String]): Unit = {
    val arr1 = Array(1, 4, 8, 9, 6)
    val arr2 = Array(0, 7, 1, 3, 40)

    // result = 1*0 + 4*7 + 8*1 + 9*3 + 6*40 = 0 + 28 + 8 + 27 + 240 = 303

    println(s"Dot product = ${calculateDotProduct(arr1, arr2)}")
  }
}

 
  
/*
run:
      
Dot product = 303
      
*/

 

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