Question

How to calculate dot product of two arrays in Kotlin

Answer 1

fun calculateDotProduct(arr1: IntArray, arr2: IntArray): Int {
    var product = 0
    val size = arr1.size

    for (i in 0 until size) {
        product += arr1[i] * arr2[i]
    }

    return product
}


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

fun main() {
    val arr1 = intArrayOf(1, 4, 8, 9, 6)
	val arr2 = intArrayOf(0, 7, 1, 3, 40)
 
    println("Dot product = ${calculateDotProduct(arr1, arr2)}")
}


/*
run:
  
Dot product = 303
  
*/

 

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