Distribution plot of rand.Shuffle() on a 3 item array 1000 times

dist.go

package main

import (
	"image/color"
	"log"
	"math/rand"

	"gonum.org/v1/plot"
	"gonum.org/v1/plot/plotter"
)

func main() {
	var array []int
	for i := 0; i < 3; i++ {
		array = append(array, rand.Int())
	}

	var dist []int
	for i := 0; i < 1000; i++ {
		rand.Shuffle(len(array), func(i, j int) {
			array[i], array[j] = array[j], array[i]
		})
		dist = append(dist, array[0])
	}

	hist(dist, "uniform", "Distribution")
}

func hist(dist []int, name, title string) {
	n := len(dist)
	vals := make(plotter.Values, n)
	for i := 0; i < n; i++ {
		vals[i] = float64(dist[i])
	}

	plt := plot.New()
	plt.Title.Text = title
	hist, err := plotter.NewHist(vals, 25) // 25 bins
	if err != nil {
		log.Println("Cannot plot:", err)
	}
	hist.FillColor = color.RGBA{R: 255, G: 127, B: 80, A: 255} // coral color
	plt.Add(hist)

	err = plt.Save(400, 200, name+".png")
	if err != nil {
		log.Panic(err)
	}
}