My answer of "a tour of Go #36( http://go-tour-jp.appspot.com/#36 )"

gotour_36.go

package main

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

func Pic(dx, dy int) [][]uint8 {
    result := make([][]uint8, dx)
    for x := 0; x < dx; x++ {
        innerSlice := make([]uint8, dy)
        for y := 0; y < dy; y++ {
            // x^y
            innerSlice[y] = uint8(math.Pow(float64(x), float64(y)))
			// (x+y)/2
            // innerSlice[y] = uint8((x + y)/ 2)
            // x * y
            // innerSlice[y] = uint8(x * y)
        }
        result[x] = innerSlice
    }
    return result
}

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