3 X Relative Strength Index

// =====================================
// 3 X RSI
// by KRACH 

 
// ELI5 Description:
// =================
// Three RSI in one window allows different timeframes
// to be seen on one chart. Also have a look what happens 
// when the timeframes cross
// 
// Default setting is : 9, 18, 27 
// Adjust to your needs
// 
// ====================
// *Get Rekt at your own risk*
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// =====================================

study(title="Relative Strength Index", shorttitle="KRACH RSI 3X")
src = close, len = input(9, minval=1, title="RSI 1 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=black)
band1 = hline(70)
band0 = hline(30)
fill(band1, band0, color=white, transp=90)

src2 = close, len2 = input(18, minval=1, title="RSI 2 Length")
up2 = rma(max(change(src2), 0), len2)
down2 = rma(-min(change(src2), 0), len2)
rsi2 = down2 == 0 ? 100 : up2 == 0 ? 0 : 100 - (100 / (1 + up2 / down2))
plot(rsi2, color=blue)
band12 = hline(70)
band02 = hline(30)
fill(band1, band0, color=white, transp=90)

src3 = close, len3 = input(27, minval=1, title="RSI 3 Length")
up3 = rma(max(change(src3), 0), len3)
down3 = rma(-min(change(src3), 0), len3)
rsi3 = down3 == 0 ? 100 : up3 == 0 ? 0 : 100 - (100 / (1 + up3 / down3))
plot(rsi3, color=green)
band31 = hline(70)
band30 = hline(30)
fill(band1, band0, color=white, transp=90)