func avg(xs) {
    var acc = 0.0
    var c = 0
    for x in xs {
        c += 1
        acc += x
    }
    acc / c
}

func sma(p) {
    var s = []
    x => {
        if s.Length() >= p {
            s.RemoveAt(0)
        }
        s.Insert(s.Length(), x)
        avg(s)
    };
}

var nums = Iterator.Concat(1.0..5.0, 5.0^-1.0..1.0)
var sma3 = sma(3)
var sma5 = sma(5)

for n in nums {
    print("\(n)\t(sma3) \(sma3(n))\t(sma5) \(sma5(n))")
}