SMA = {}
SMA.P = 5  // (a default; may be overridden)
SMA.buffer = null
SMA.next = function(n)
    if self.buffer == null then self.buffer = []
    self.buffer.push n
    if self.buffer.len > self.P then self.buffer.pull
    return self.buffer.sum / self.buffer.len
end function

sma3 = new SMA
sma3.P = 3
sma5 = new SMA

for i in range(10)
    num = round(rnd*100)
    print "num: " + num + "  sma3: " + sma3.next(num) + "  sma5: " + sma5.next(num)
end for