RSI_WMA, RSI with WMA overlay

study(title="RSI_WMA", shorttitle="RSI_WMA_", overlay=false)
src = close, 
len = input(20, minval=1, title="RSI Length")
len2 = input(13, minval=1, title="WMA 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))
wmaRSI = wma(rsi,len2)
plot(rsi, title="RSI", style=line, linewidth=1, color=purple)
plot(wmaRSI, title="WMA of RSI", style=line, linewidth=1, color=blue)
band2 = hline(50)
band1 = hline(70)
band0 = hline(30)
fill(band1, band0, color=purple, transp=90)