Golang : Arithmetic operation with numerical slices or arrays example
Got an email from a new comer to Golang from South Africa, he or she wanted to know how to perform simple operations like arithmetic on numerical slices. There is a package - GoNum - that can do a better job for these kind of problems ... which I reckon is more efficient for mathematical calculations than using Golang's standard slices. However, there is no harm to use slices if all you wanted is to perform some simple operations like plus, minus, multiplication or division on slices or array.
Below is an example of how to use slices for arithmetic operations:
package main
import (
"fmt"
)
func main() {
a := []int{1, 2, 3, 4}
fmt.Println("Original : ", a)
// a * 2
for i, _ := range a {
a[i] = a[i] * 2
}
fmt.Println("a * 2 : ", a)
// a + 10
for i, _ := range a {
a[i] = a[i] + 10
}
fmt.Println("a + 10 : ", a)
b := []int{5, 6, 7, 8}
fmt.Println("b : ", b)
lengthOfA := len(a)
// will cause non-constant array bound lengthOfA error
//c := [lengthOfA]int{}
// if c size is constant, it is ok to hardcode with size of 4 (hand counted)
// c := [4]int{}
// or to make your program more robust
// figure out the slice c's length during runtime with length of a slice
c := make([]int, lengthOfA)
// a + b
// FOR a slice to plus b slice, the size or number of elements in both slices must be the same!
for i, _ := range a {
c[i] = a[i] + b[i]
}
fmt.Printf("a + b : %v + %v = %v \n", a, b, c)
d := make([]int, lengthOfA)
// a * b
for i, _ := range a {
d[i] = a[i] * b[i]
}
fmt.Printf("a * b : %v * %v = %v \n", a, b, d)
// use float64 instead of int type for division
e := make([]float64, lengthOfA)
// a / b
for i, _ := range a {
e[i] = float64(a[i]) / float64(b[i])
}
fmt.Printf("a / b : %v * %v = %v \n", a, b, e)
f := make([]int, lengthOfA)
// a - b
for i, _ := range a {
f[i] = a[i] - b[i]
}
fmt.Printf("a - b : %v * %v = %v \n", a, b, f)
}
Output:
Original : [1 2 3 4]
a * 2 : [2 4 6 8]
a + 10 : [12 14 16 18]
b : [5 6 7 8]
a + b : [12 14 16 18] + [5 6 7 8] = [17 20 23 26]
a * b : [12 14 16 18] * [5 6 7 8] = [60 84 112 144]
a / b : [12 14 16 18] * [5 6 7 8] = [2.4 2.3333333333333335 2.2857142857142856 2.25]
a - b : [12 14 16 18] * [5 6 7 8] = [7 8 9 10]
References:
https://socketloop.com/tutorials/golang-combine-slices-of-complex-numbers-and-operation-example
https://www.socketloop.com/tutorials/golang-squaring-elements-in-array
See also : Golang : Combine slices of complex numbers and operation example
By Adam Ng
IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.
Advertisement
Tutorials
+14.3k Golang : On enumeration
+7.1k Golang : Use modern ciphers only in secure connection
+4.8k Golang : A program that contain another program and executes it during run-time
+7.9k Setting $GOPATH environment variable for Unix/Linux and Windows
+22.1k Golang : Print leading(padding) zero or spaces in fmt.Printf?
+5.7k List of Golang XML tutorials
+6.5k Golang : Warp text string by number of characters or runes example
+9.9k CodeIgniter : Load different view for mobile devices
+36.6k Golang : Display float in 2 decimal points and rounding up or down
+7.5k Android Studio : AlertDialog to get user attention example
+12.7k Swift : Convert (cast) Int or int32 value to CGFloat
+10.9k Golang : Create Temporary File