predictions.go

package main

import (

	"fmt"
	"math/rand"
	"math"
	"time"
)

func init() {
	rand.Seed(time.Now().UTC().UnixNano())
}

func randomInt() int32 {

	return rand.Int31()
}

func sum(nums []int64) (sum int64) {
	for _,v:=range nums{
		sum+=int64(v)
	}
	return
}

func avg(nums []int64) float32 {
	return float32(sum(nums))/float32(len(nums))
}

func std(nums []int64) float64 {
	std:=float64(0)
	mean:=avg(nums)
	for _,v:=range nums{
		std+=math.Pow(float64(v)-float64(mean),float64(2))
	}
	std=math.Sqrt(std/float64(len(nums)))
	return std
}

func main() {
	var s int64
	var numbers100 []int64=make([]int64,10000)
	for k:=0;k<10000;k++ {
		s=0
		for i := 0; i < 10000; i++ {
			s += int64(randomInt())
		}
		numbers100[k]=s;
		//fmt.Println(s)
	}
	fmt.Printf("%f",std(numbers100))
	fmt.Println()



	var numbers3 []int64=make([]int64,10000)
	for k:=0;k<10000;k++ {
		s=0
		for i := 0; i < 3; i++ {
			s += int64(randomInt())
		}
		numbers3[k]=s;
		//fmt.Println(s)
	}
	fmt.Printf("%f",std(numbers3))
}