strategy MACD and RSI alert fixed — Indicator by munsifk

I notice that my previous request for help has gathered alot of attention. This is the fixed alert for anyone who wants it, sorry it has been so long since the initial video but I have been super busy with exam work.

Open-source script

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study(title="Strategy MACD and RSI alert", shorttitle="Strategy MACD and RSI alert", overlay = false )
fastLength = input(8, minval=1)
slowLength = input(16,minval=1)
signalLength=input(11,minval=1)
hline(0, color=purple, linestyle=dashed)
fastMA = ema(close, fastLength)
slowMA = ema(close, slowLength)
macd = fastMA - slowMA
signal = sma(macd, signalLength)

Length = input(10, minval=1)
Oversold = input(49, minval=1)
Overbought = input(51, minval=1)
xRSI = rsi(close, Length)



pos = iff(xRSI > Overbought and signal < macd, 1,
        iff(xRSI < Oversold and signal > macd, -1, nz(pos[1], 0))) 
        
poschange = (pos[1] == -1 and pos == 1) or (pos[1] == 1 and pos == -1 ) ? 1 : 0  
barcolor(pos == -1 ? red: pos == 1 ? green : blue)

//plot(pos, title="pos", style=line, linewidth=1, color=red )
plot(poschange, title="change of colour alert", style=line, linewidth=1, color=yellow )