simple solution to Go tour slide 35, exercise on slices. This prints a blue gradient

go_tour_slice_exercise.go

package main

import (
	"code.google.com/p/go-tour/pic"
	"math"
)

func Pic(dx, dy int) [][]uint8 {
	p := make([][] uint8, dy)
	for i :=0; i < dy; i++ {
		p[i] = make([] uint8, dx)
	}

	for i :=0; i < dy; i++ {
		for z :=0; z < dx; z++ {
			p[i][z] = uint8(math.Nextafter(float64(i), float64(z)))
		}
	}

	return p
}

func main() {
	pic.Show(Pic)
}