Stationary Triple Wave filtered

//@version=5
indicator("Stationary Triple Wave", overlay=false)

// Define input parameters
len1 = input.int(5, "Length 1")
len2 = input.int(10, "Length 2")
len3 = input.int(20, "Length 3")

// Calculate the waves
wave1 = math.sin(2 * math.pi * len1 / bar_index)
wave2 = math.sin(2 * math.pi * len2 / bar_index)
wave3 = math.sin(2 * math.pi * len3 / bar_index)

// Combine the waves using polarization
polarization = input("Linear", "Polarization")
var wave = 0.0
if polarization == "Linear"
    wave := wave1 + wave2 + wave3
else
    var phase = bar_index * math.pi / len3
    wave := wave1 * math.cos(phase) + wave2 * math.sin(phase) + wave3 * math.cos(2 * phase)

// Add close price to the wave
wave += input(close)

// Stationary filter smoother
length = input.int(10, "Smoother Length")
smoother = 0.0
for i = 0 to length - 1
    smoother += wave[i]
smoother /= length

// Plot the smoothed wave
plot(smoother, color=color.red)