Question

How to calculate dot product of two arrays in Swift

Answer 1

func calculateDotProduct(arr1: [Int], arr2: [Int]) -> Int {
    var product = 0
    let size = arr1.count
    
    for i in 0..<size {
        product += arr1[i] * arr2[i]
    }
    
    return product
}

let arr1 = [1, 4, 8, 9, 6]
let arr2 = [0, 7, 1, 3, 40]

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

print("Dot product = \(calculateDotProduct(arr1: arr1, arr2: arr2))")



/*
run:
   
Dot product = 303

*/

 

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