MACD Indicator

study(title="Moving Average Convergence/Divergence", shorttitle="MACD")
source = close
fastLength = input(5, minval=1), slowLength=input(21,minval=1)
signalLength=input(13,minval=1)
fastMA = ema(source, fastLength)
slowMA = ema(source, slowLength)
macd = fastMA - slowMA
signal = sma(macd, signalLength)
hist = macd - signal
plot(hist, color=green, style=histogram)
plot(macd, color=blue)
plot(signal, color=orange)