Question

How to calculate the dot product of two arrays in Rust

Answer 1

fn calculate_dot_product(arr1: &[i32], arr2: &[i32]) -> i32 {
    let mut product = 0;
    let size = arr1.len();

    for i in 0..size {
        product += arr1[i] * arr2[i];
    }

    product
}

fn main() {
    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

    println!("Dot product = {}", calculate_dot_product(&arr1, &arr2));
}



  
/*
run:

Dot product = 303

*/

 

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