EC_RSI Plus EMA

study(title="CM_RSI_EMA", shorttitle="CM_RSI_EMA_", overlay=false)
src = close,
len = input(20, minval=1, title="RSI Length")
len2 = input(10, minval=1, title="EMA of RSI Length")
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))
emaRSI = ema(rsi,len2)

plot(rsi, title="RSI", style=area, linewidth=3, color=silver)
plot(emaRSI, title="EMA of RSI", style=area, linewidth=2, color=red)
band1 = hline(80, title="Upper Line", linestyle=dashed, linewidth=3, color=red)
band0 = hline(20, title="Lower Line", linestyle=dashed, linewidth=3, color=lime)
fill(band1, band0, color=purple, transp=90)