REKT SI

study(title="Relative Strength Index-EXP", shorttitle="REKT SI")
src = close, len = input(60, minval=1, title="Length"),lend = input(30, minval=1, title="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))
plot(rsi, color=purple)
band1 = hline(70)
band0 = hline(30)
fill(band1, band0, color=silver, transp=90)