[Go] Population Standard Deviation

popstddev.go

package main
 
import (
	"flag"
	"fmt"
	"math"
	"strconv"
)
 
func main() {
 
	flag.Parse()
 
	input := []int{}
 
	for _, i := range flag.Args() {
		i, _ := strconv.Atoi(i)
		input = append(input, i)
	}
 
	in_mean := mean(input)
 
	fmt.Println(fmt.Sprintf("StdDev: %.4f", stddev(in_mean, input)))
 
}
 
func mean(input []int) float64 {
 
	total := 0.0
 
	for _, i := range input {
		total = total + float64(i)
	}
 
	return (total / float64(len(input)))
}
 
func stddev(meanval float64, input []int) float64 {
 
	variance_total := 0.0
 
	for _, i := range input {
		j := float64(i)
		variance_total = variance_total + ((j - meanval) * (j - meanval))
	}
	return math.Sqrt(float64(variance_total) / float64(len(input)))
 
}

Cheated reading ints from cmd arguments using the standard flags package.