# Laguerre-based RSI

1717 0
Hi,
This is RSI indicator which is more sesitive to price changes.
It is based upon a modern math tool - Laguerre transform filter.
With help of Laguerre filter one becomes able to create superior
indicators using very short data lengths as well. The use of shorter
data lengths means you can make the indicators more responsive to
changes in the price.
```////////////////////////////////////////////////////////////
//  Copyright by HPotter v1.0 29/04/2014
// This is RSI indicator which is more sesitive to price changes.
// It is based upon a modern math tool - Laguerre transform filter.
// With help of Laguerre filter one becomes able to create superior
// indicators using very short data lengths as well. The use of shorter
// data lengths means you can make the indicators more responsive to
// changes in the price.
////////////////////////////////////////////////////////////
study(title="Laguerre-based RSI", shorttitle="Laguerre-RSI")
gamma = input(0.5, minval=-0.1, maxval = 0.9)
hline(0.80, color=blue, linestyle=line)
hline(0.20, color=blue, linestyle=line)
xL0 = (1-gamma) * close + gamma * nz(xL0[1], 1)
xL1 = - gamma * xL0 + nz(xL0[1], 1) + gamma * nz(xL1[1], 1)
xL2 = - gamma * xL1 + nz(xL1[1], 1) + gamma * nz(xL2[1], 1)
xL3 = - gamma * xL2 + nz(xL2[1], 1) + gamma * nz(xL3[1], 1)
CU = (xL0 >= xL1 ? xL0 - xL1 : 0) + (xL1 >= xL2 ? xL1 - xL2 : 0)  + (xL2 >= xL3 ? xL2 - xL3 : 0)
CD = (xL0 >= xL1 ? 0 : xL1 - xL0) + (xL1 >= xL2 ? 0 : xL2 - xL1)  + (xL2 >= xL3 ? 0 : xL3 - xL2)
nRes = iff(CU + CD != 0, CU / (CU + CD), 0)
plot(nRes, color=red, title="Laguerre-based RSI")
```
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