Hello again,

i’ve done some modification starting from Nicola’s version, i managed to make it work the same way as on trading view, here’s the code.
you can’t use it for alerts for now, it only draws the envelope.

see attached image i’ve tested it on ETHUSD on the m1 timeframe.

i’ll keep imporving it, to see if in any way it can be used in live trading.

Zakaria

//Nadaraya-Watson Envelope
defparam drawonlastbaronly = true
length = 500//Window Size
hh      = 8 //Bandwidth
mult   = 0.45

src    = Close
 
n = barindex
k = 2
 
if IsLastBarUpdate then
y2 = 0
sume = 0
for i = 0 to length-1
sum = 0
sumw = 0
        
for j = 0 to length-1
w = EXP(-pow(i-j,2)/(hh*hh*2))
sum = sum+src[j]*w
sumw = sumw+w
next
y2 = sum/sumw
sume = sume+abs(src[i] - y2)
$a[barindex-i]=y2
//DRAWPOINT(barindex-i, y2, 1)

next
mae = sume/(length*mult)
for i=0 to length-1

DRAWPOINT(barindex-i, $a[barindex-i]-mae, 1) coloured(0,255,0,100)
DRAWPOINT(barindex-i, $a[barindex-i]+mae, 1) coloured(255,0,0,100)
//if close[barindex-i] > ($a[barindex-i]+mae) then // and src[1]<y2[1]+mae then
//drawarrowdown(barindex-i,high) coloured("red")
//endif
//if close[barindex-i] < ($a[barindex-i]-mae) then //and src[1]>y2[1]-mae then
//drawarrowup(barindex-i,low) coloured("green")
//endif
next

/*drawpoint(barindex,y2,1)
drawpoint(barindex,y2+mae,1)
drawpoint(barindex,y2-mae,1)*/
 
Y2High=$a[barindex]+mae
Y2Low=$a[barindex]-mae
endif
 
return