Help with script/formula NZ parameter error

[spartan.ts]

Hello, attempted to convert this script from pinescript:
https://www.tradingview.com/script/DaHLcICg-Ehlers-Instantaneous-Trend-LazyBear/

But can't get past a parameter error in "it" formula: nz(it[1], ((src + 2 * src[1] + src[2]) / 4.0))

i can see that the nz script only takes 1 parameter and likely the cause, but unsure how to mitigate it in formula.

Any help would be most appreciated. thanks

input src = hl2; # src=input(hl2, title="Source")
input a = .07; #a= input(0.07, title="Alpha", step=0.01)
input fr = NO; #fr=input(false, title="Fill Trend Region")

script nz {
input data = 0;
def ret_val = if IsNaN(data) then 0 else data;
plot return = ret_val;
}

def it = (a - ((a * a) / 4.0)) * src + 0.5 * a * a * src[1] - (a - 0.75 * a * a) * src[2] + 2 * (1 - a ) * nz(it[1], ((src + 2 * src[1] + src[2]) / 4.0)) - (1 - a ) * (1 - a ) * nz(it[2], ((src + 2 * src[1] + src[2]) / 4.0));

def lag = 2.0 * it - nz(it[2]);

plot tline = if it > lag then it else Double.NaN;
#dl=plot(fr and (not hr)?(it>lag?lag:it):na, color=gray, style=circles, linewidth=0, title="Dummy")

AddCloud( if fr and it then it else Double.NaN, lag, Color.PINK, Color.BLUE );

 

[halcyonguy]

Hello, attempted to convert this script from pinescript:
https://www.tradingview.com/script/DaHLcICg-Ehlers-Instantaneous-Trend-LazyBear/

But can't get past a parameter error in "it" formula: nz(it[1], ((src + 2 * src[1] + src[2]) / 4.0))

i can see that the nz script only takes 1 parameter and likely the cause, but unsure how to mitigate it in formula.

Any help would be most appreciated. thanks

input src = hl2; # src=input(hl2, title="Source")
input a = .07; #a= input(0.07, title="Alpha", step=0.01)
input fr = NO; #fr=input(false, title="Fill Trend Region")

script nz {
input data = 0;
def ret_val = if IsNaN(data) then 0 else data;
plot return = ret_val;
}

def it = (a - ((a * a) / 4.0)) * src + 0.5 * a * a * src[1] - (a - 0.75 * a * a) * src[2] + 2 * (1 - a ) * nz(it[1], ((src + 2 * src[1] + src[2]) / 4.0)) - (1 - a ) * (1 - a ) * nz(it[2], ((src + 2 * src[1] + src[2]) / 4.0));

def lag = 2.0 * it - nz(it[2]);

plot tline = if it > lag then it else Double.NaN;
#dl=plot(fr and (not hr)?(it>lag?lag:it):na, color=gray, style=circles, linewidth=0, title="Dummy")

AddCloud( if fr and it then it else Double.NaN, lag, Color.PINK, Color.BLUE );

i see that nz() accepts 1 or 2 parameters.

if 2 Parameters and the 1st one is an error, then use the 2nd parameter.
If 1st parameter is not an error then use it.

nz( x, y )
Two args version:
returns x if it's a valid (not NaN) number, otherwise y

def a = if isnan( x ) then y else x;

 

[Svanoy]

@spartan.ts

input src = hl2; # src=input(hl2, title="Source")
input a = .07; #a= input(0.07, title="Alpha", step=0.01)
input fr = NO; #fr=input(false, title="Fill Trend Region")

script nz {
    input data = 0;
    def ret_val = if IsNaN(data) then 0 else data;
    plot return = ret_val;
}

def it;
if IsNaN(it[1]) and IsNaN(it[2]) {
    it = (a - ((a * a) / 4.0)) * src + 0.5 * a * a * src[1] - (a - 0.75 * a * a) * src[2] + 2 * (1 - a ) * 0 - (1 - a ) * (1 - a ) * 0;
} else if !IsNaN(it[1]) and IsNaN(it[2]) {
    it = (a - ((a * a) / 4.0)) * src + 0.5 * a * a * src[1] - (a - 0.75 * a * a) * src[2] + 2 * (1 - a ) * ((src + 2 * src[1] + src[2]) / 4.0) - (1 - a ) * (1 - a ) * 0;
} else if IsNaN(it[1]) and !IsNaN(it[2]) {
    it = (a - ((a * a) / 4.0)) * src + 0.5 * a * a * src[1] - (a - 0.75 * a * a) * src[2] + 2 * (1 - a ) * 0 - (1 - a ) * (1 - a ) * ((src + 2 * src[1] + src[2]) / 4.0);
} else if !IsNaN(it[1]) and !IsNaN(it[2]) {
    it = (a - ((a * a) / 4.0)) * src + 0.5 * a * a * src[1] - (a - 0.75 * a * a) * src[2] + 2 * (1 - a ) * ((src + 2 * src[1] + src[2]) / 4.0) - (1 - a ) * (1 - a ) * ((src + 2 * src[1] + src[2]) / 4.0);
} else {
    it = Double.NaN;
}

def lag = if !IsNaN(it[2]) then 2.0 * it - it[2] else Double.NaN;

plot tline = if it > lag then it else Double.NaN;
#dl=plot(fr and (not hr)?(it>lag?lag:it):na, color=gray, style=circles, linewidth=0, title="Dummy")

def cloudupper = !IsNaN(it);
def clouduppervalue = it;
AddCloud( if fr and cloudupper then clouduppervalue else Double.NaN, lag, Color.PINK, Color.BLUE );

 

[spartan.ts]

i see that nz() accepts 1 or 2 parameters.

if 2 Parameters and the 1st one is an error, then use the 2nd parameter.
If 1st parameter is not an error then use it.

nz( x, y )
Two args version:
returns x if it's a valid (not NaN) number, otherwise y

def a = if isnan( x ) then y else x;

Thanks @halcyonguy . That helped resolve that issue. Much appreciated.
BTW: most my tech gear is Halcyon if that's a scuba reference.

 

[spartan.ts]

@spartan.ts

input src = hl2; # src=input(hl2, title="Source")
input a = .07; #a= input(0.07, title="Alpha", step=0.01)
input fr = NO; #fr=input(false, title="Fill Trend Region")

script nz {
    input data = 0;
    def ret_val = if IsNaN(data) then 0 else data;
    plot return = ret_val;
}

def it;
if IsNaN(it[1]) and IsNaN(it[2]) {
    it = (a - ((a * a) / 4.0)) * src + 0.5 * a * a * src[1] - (a - 0.75 * a * a) * src[2] + 2 * (1 - a ) * 0 - (1 - a ) * (1 - a ) * 0;
} else if !IsNaN(it[1]) and IsNaN(it[2]) {
    it = (a - ((a * a) / 4.0)) * src + 0.5 * a * a * src[1] - (a - 0.75 * a * a) * src[2] + 2 * (1 - a ) * ((src + 2 * src[1] + src[2]) / 4.0) - (1 - a ) * (1 - a ) * 0;
} else if IsNaN(it[1]) and !IsNaN(it[2]) {
    it = (a - ((a * a) / 4.0)) * src + 0.5 * a * a * src[1] - (a - 0.75 * a * a) * src[2] + 2 * (1 - a ) * 0 - (1 - a ) * (1 - a ) * ((src + 2 * src[1] + src[2]) / 4.0);
} else if !IsNaN(it[1]) and !IsNaN(it[2]) {
    it = (a - ((a * a) / 4.0)) * src + 0.5 * a * a * src[1] - (a - 0.75 * a * a) * src[2] + 2 * (1 - a ) * ((src + 2 * src[1] + src[2]) / 4.0) - (1 - a ) * (1 - a ) * ((src + 2 * src[1] + src[2]) / 4.0);
} else {
    it = Double.NaN;
}

def lag = if !IsNaN(it[2]) then 2.0 * it - it[2] else Double.NaN;

plot tline = if it > lag then it else Double.NaN;
#dl=plot(fr and (not hr)?(it>lag?lag:it):na, color=gray, style=circles, linewidth=0, title="Dummy")

def cloudupper = !IsNaN(it);
def clouduppervalue = it;
AddCloud( if fr and cloudupper then clouduppervalue else Double.NaN, lag, Color.PINK, Color.BLUE );

Thanks unfortunately that did not return what was expected.
here is my work in progress which currently does work.

input src = hl2; # src=input(hl2, title="Source")
input a = .021; #a= input(0.07, title="Alpha", step=0.01)
#input fr = NO; #fr=input(false, title="Fill Trend Region")
#input ebc = no; #ebc=input(false, title="Enable barcolors")
#input hr = no; #hr=input(false, title="Hide Ribbon")
script nz {
input data = 0;
input data2 = 0;
def ret_val = if IsNaN(data) then data2 else data;
plot return = ret_val;
}

def it = (a - ((a * a) / 4.0)) * src + 0.5 * a * a * src[1] - (a - 0.75 * a * a) * src[2] + 2 * (1 - a ) * nz(it[1], ((src + 2 * src[1] + src[2]) / 4.0)) - (1 - a ) * (1 - a ) * nz(it[2], ((src + 2 * src[1] + src[2]) / 4.0));


plot lag = 2.0 * it - nz(it[2]);

plot tline = it; #if it > lag then it else Double.NaN;
#dl=plot(fr and (not hr)?(it>lag?lag:it):na, color=gray, style=circles, linewidth=0, title="Dummy")

AddCloud(tline, lag, Color.PINK, Color.BLUE );

def buy = lag > tline ;
def stopbuy = lag <= tline;
def buynow = !buy[1] and buy;
def buysignal = CompoundValue(1, if buynow and !stopbuy then 1 else if buysignal[1] == 1 and stopbuy then 0 else buysignal[1], 0);

plot Buy_Signal = buysignal[1] == 0 and buysignal == 1;
Buy_Signal.SetPaintingStrategy(PaintingStrategy.BOOLEAN_ARROW_UP);
Buy_Signal.SetDefaultColor(Color.cyan);
Buy_Signal.HideTitle();


def sell = lag < tline ;
def stopsell = lag >= tline;
def sellnow = !sell[1] and sell;
def sellsignal = CompoundValue(1, if sellnow and !stopsell then 1 else if sellsignal[1] == 1 and stopsell then 0 else sellsignal[1], 0);


plot Sell_Signal = sellsignal[1] == 0 and sellsignal;
Sell_Signal.SetPaintingStrategy(PaintingStrategy.BOOLEAN_ARROW_DOWN);
Sell_Signal.SetDefaultColor(Color.cyan);
Sell_Signal.HideTitle();

 

[halcyonguy]

Thanks @halcyonguy . That helped resolve that issue. Much appreciated.
BTW: most my tech gear is Halcyon if that's a scuba reference.

not scuba, just a different word i came across 1 day, it means calm or happy