Make strategy with arrays in Pine - arrays

Question

I'm trying to make a strategy of an indicator, but I get the error: Line 73: Cannot call 'operator >' with argument 'expr0'='call 'alertcondition' (void)'. An argument of 'void' type was used but a 'const float' is expected. How can I change the code to get a correct boolean if statement for the trade entry? I'm very new to pine, hopefully someone can help me.
// This work is licensed under a Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) https://creativecommons.org/licenses/by-nc-sa/4.0/
// © LuxAlgo
//#version=5
// Umgeschrieben von JSt
strategy("Watson Strategie Nadaraya-Watson Envelope [JSt]",overlay=true,max_bars_back=1000,max_lines_count=500,max_labels_count=500)
length = input.float(500,'Window Size',maxval=500,minval=0)
h = input.float(8.,'Bandwidth')
mult = input.float(3.)
src = input.source(close,'Source')
up_col = input.color(#39ff14,'Colors',inline='col')
dn_col = input.color(#ff1100,'',inline='col')
//----
n = bar_index
var k = 2
var upper = array.new_line(0)
var lower = array.new_line(0)
lset(l,x1,y1,x2,y2,col)=>
line.set_xy1(l,x1,y1)
line.set_xy2(l,x2,y2)
line.set_color(l,col)
line.set_width(l,2)
if barstate.isfirst
for i = 0 to length/k-1
array.push(upper,line.new(na,na,na,na))
array.push(lower,line.new(na,na,na,na))
//----
line up = na
line dn = na
//----
cross_up = 0.
cross_dn = 0.
if barstate.islast
y = array.new_float(0)
sum_e = 0.
for i = 0 to length-1
sum = 0.
sumw = 0.
for j = 0 to length-1
w = math.exp(-(math.pow(i-j,2)/(h*h*2)))
sum += src[j]*w
sumw += w
y2 = sum/sumw
sum_e += math.abs(src[i] - y2)
array.push(y,y2)
mae = sum_e/length*mult
for i = 1 to length-1
y2 = array.get(y,i)
y1 = array.get(y,i-1)
up := array.get(upper,i/k)
dn := array.get(lower,i/k)
lset(up,n-i+1,y1 + mae,n-i,y2 + mae,up_col)
lset(dn,n-i+1,y1 - mae,n-i,y2 - mae,dn_col)
if src[i] > y1 + mae and src[i+1] < y1 + mae
label.new(n-i,src[i],'▼',color=#00000000,style=label.style_label_down,textcolor=dn_col,textalign=text.align_center)
if src[i] < y1 - mae and src[i+1] > y1 - mae
label.new(n-i,src[i],'▲',color=#00000000,style=label.style_label_up,textcolor=up_col,textalign=text.align_center)
cross_up := array.get(y,0) + mae
cross_dn := array.get(y,0) - mae
// TestUP = ta.crossover(src,cross_up) > 0
alertcondition(ta.crossover(src,cross_up),'Down','Down')
alertcondition(ta.crossunder(src,cross_dn),'Up','Up')
//---- Alarm für Webhook -----
plot(cross_up, color=#000000, transp=100) //Für den Alert, jedoch Darstellungsfehler → Transparent
plot(cross_dn, color=#000000, transp=100)
plotchar(cross_up, title="cross_up%", char="", location=location.top, color = color.green) // Damit der Wert in der Statusleiste dargestellt wird
plotchar(cross_dn, title="cross_dn%", char="", location=location.top, color = color.red)
//-------------------
// Start Date
// STEP 1. Create inputs that configure the backtest's date range
useDateFilter = input.bool(true, title="Begin Backtest at Start Date",
group="Backtest Time Period")
backtestStartDate = input.time(timestamp("1 Jan 2021"),
title="Start Date", group="Backtest Time Period",
tooltip="This start date is in the time zone of the exchange " +
"where the chart's instrument trades. It doesn't use the time " +
"zone of the chart or of your computer.")
// STEP 2. See if current bar happens on, or later than, the start date
inTradeWindow = not useDateFilter or time >= backtestStartDate
// ---------------
// Enter a long position when the entry rule is triggered
if inTradeWindow and ta.crossover(src,cross_up) > 0
strategy.entry('Long', strategy.long)
// Exit the Long position when the exit rule is triggered
if close > strategy.position_avg_price + 50
strategy.close("Long", comment = "TP")
else if close < strategy.position_avg_price - 50
strategy.close("Long", comment = "SL")
I tried the ta.crossover(src,cross_up) to compare it to zero, but it doesn't work.

Answer 1

ta.crossover() returns a bool value.
ta.crossover(source1, source2) → series bool
So, comparing its return value with some number does not make any sense and the compiler will complain: ta.crossover(src,cross_up) > 0.
You should just do:
if inTradeWindow and ta.crossover(src,cross_up)
strategy.entry('Long', strategy.long)