RSI
study(title="Ersoy/relative Strength Index", shorttitle="RSI") src = close, len = input(14, minval=1, title="Length") c= src[1]<src ? lime:red up = rma(max(change(src), 0), len) down = rma(-min(change(src), 0), len) rsi = down == 0 ? 100 : up == 0 ? 0 : 100 - (100 / (1 + up / down)) plot(rsi, color=black) band1 = hline(70,color=red,linestyle=solid,linewidth=2) band0 = hline(30,color=lime,linestyle=solid,linewidth=2) fill(band1, band0, color=aqua , transp=90) plot(50,color=c) bgcolor(up>down ? lime:red,transp=20)