pine cannot determine the referencing length of a series using barstate.islast - loops

Question

I receive the error "pine cannot determine the referencing length of a series. try using max_bars_back in the study or strategy function" when trying to perform a function on the barstate.islast condition.
I am using this condition in order to try and speed up my script as it does not need to perform all actions in the function until the last bar of the script. Even performing the function on the last bar is intensive, so I attempt to bypass unnecessary logic when able by using the stopPocIndexNo bool once the lines requested have been drawn.
If I remove the bool, then the loop on any particular bar takes to long > 500ms.
//#version=5
indicator("High Volume Candle Mid", overlay = true, max_lines_count = 100, max_labels_count = 100, max_bars_back = 5000)
maLengthInput = input.int(defval = 34, title = "Volume - Moving Average Length", group = "Options")
volLengthInput = input.int(defval = 5, title = "Volume - Look Back", group = "Options")
maMultiplierInput = input.float(defval = 2, title = "Volume - MA Multiplier", tooltip = "Filter's out weak volume candles that break MA", group = "Options")
qtyOfClosesInput = input.int(defval = 3, title = "(n) closes to cross POC to invalidate.", group = "Options")
qtyOfLinesInput = input.int(defval = 10, title = "(n) latest POC's to show", group = "Options")
qtyOfBrokenLinesInput = input.int(defval = 10, title = "(n) latest historical POC's to show", group = "Options")
barAlignInput = input.int(defval = 20, title = "Bar Index Offset", tooltip = "How many bars past price to extend labels/lines", group = "Options")
supplyColorInput = input.color(defval = #FF5252, title = "Supply Zone - POC's", group = "Options" )
demandColorInput = input.color(defval = #4CAF50, title = "Demand Zone - POC's", group = "Options")
///// Variables
var float maVol = na
var float highestVol = na
var bool pocCondition = false
var float[] barOpens = array.new_float()
var float[] barCloses = array.new_float()
var float[] barPocs = array.new_float()
var color[] barColors = array.new_color()
///// Functions
deleteLines() =>
a_allLines = line.all
if array.size(a_allLines) > 0
for i = 0 to array.size(a_allLines) - 1
line.delete(array.get(a_allLines, i))
deleteLabels() =>
a_allLabels = label.all
if array.size(a_allLabels) > 0
for i = 0 to array.size(a_allLabels) - 1
label.delete(array.get(a_allLabels, i))
createLines(arrayOfPocs, arrayOfOpens, arrayOfCloses, arrayOfColors, qtyOfCloses, maxLines, maxBrokenLines, barAlign, demandColor, supplyColor) =>
int qtyOfPocs = array.size(arrayOfPocs)
int supplyLinesCount = 0
int supplyBrokenLinesCount = 0
int demandLinesCount = 0
int demandBrokenLinesCount = 0
float lastClose = close[1]
bool stopPocIndexNo = false
deleteLines()
deleteLabels()
for pocIndexNo = (qtyOfPocs > 1 ? qtyOfPocs - 1 : na) to 0
int closeCount = 0
bool lineCrossed = false
int barsSince = (bar_index - pocIndexNo) - 1
float barPoc = array.get(arrayOfPocs, pocIndexNo)
cColor = array.get(arrayOfColors, pocIndexNo)
//string supplyCrossedCloses = na
//string demandCrossedCloses = na
if stopPocIndexNo == false
if barPoc > 0 and barsSince > 2
bool isDemand = barPoc < lastClose
int lineIndex = (bar_index - barsSince) > (bar_index - 2500) ? (bar_index - barsSince) : bar_index - 2500
for indexNo = barsSince to 1
if lineCrossed == false
fClose = array.get(arrayOfCloses, indexNo)
fOpen = array.get(arrayOfOpens, indexNo)
if (fClose > barPoc and fOpen < barPoc) or (fClose < barPoc and fOpen > barPoc)
closeCount := closeCount + 1
if (closeCount > qtyOfCloses)
lineCrossed := true
if lineCrossed
if isDemand and demandBrokenLinesCount < maxBrokenLines
line.new(lineIndex, barPoc, bar_index + barAlign, barPoc, color = color.new(color.white, 50), style = line.style_dotted, width = 1, extend = extend.none)
label.new(bar_index + barAlign, barPoc, text = str.tostring(barPoc), textcolor = color.new(color.white, 50), textalign = text.align_right, style = label.style_none)
demandBrokenLinesCount := demandBrokenLinesCount + 1
else
if supplyBrokenLinesCount < maxBrokenLines
line.new(lineIndex, barPoc, bar_index + barAlign, barPoc, color = color.new(color.white, 50), style = line.style_dotted, width = 1, extend = extend.none)
label.new(bar_index + barAlign, barPoc, text = str.tostring(barPoc), textcolor = color.new(color.white, 50), textalign = text.align_right, style = label.style_none)
supplyBrokenLinesCount := supplyBrokenLinesCount + 1
else
if lineCrossed == false
if isDemand and demandLinesCount < maxLines
line.new(lineIndex, barPoc, bar_index + barAlign, barPoc, color = cColor, style = line.style_dashed, width = 1, extend = extend.none)
label.new(bar_index + barAlign, barPoc, text = str.tostring(barPoc), textcolor = cColor, textalign = text.align_right, style = label.style_none)
demandLinesCount := demandLinesCount + 1
else
if supplyLinesCount < maxLines
line.new(lineIndex, barPoc, bar_index + barAlign, barPoc, color = cColor, style = line.style_dashed, width = 1, extend = extend.none)
label.new(bar_index + barAlign, barPoc, text = str.tostring(barPoc), textcolor = cColor, textalign = text.align_right, style = label.style_none)
supplyLinesCount := supplyLinesCount + 1
if supplyBrokenLinesCount == maxBrokenLines and demandBrokenLinesCount == maxBrokenLines and supplyLinesCount == maxLines and demandLinesCount == maxLines
stopPocIndexNo := true
///// Calculations
// Calculate moving average and highest volume bar in the last volLengthInput
maVol := ta.sma(volume, maLengthInput)
highestVol := ta.highest(volume, volLengthInput)
// Detect new POC Lines by finding vars that breached the Moving Average with Multiplier as well as being the most recent highest volume bar
pocCondition := (volume >= maVol * maMultiplierInput) and volume == highestVol
// Store bar POC's if poc condition is met, otherwise store nothing
if pocCondition
array.push(barPocs, (high + low)/2)
if close > open
array.push(barColors, demandColorInput)
else
array.push(barColors, supplyColorInput)
else
array.push(barPocs, 0)
array.push(barColors, na)
// Store opens/closes for later calculations to detect line crosses
array.push(barCloses, close)
array.push(barOpens, open)
// We don't want to calculate line breaches every bar as it would be too slow, so wait until its the last bar to look for POC's
if barstate.islast
aOpens = array.copy(barOpens)
aCloses = array.copy(barCloses)
array.reverse(aOpens)
array.reverse(aCloses)
createLines(barPocs, aOpens, aCloses, barColors, qtyOfClosesInput, qtyOfLinesInput/2, qtyOfBrokenLinesInput/2, barAlignInput, demandColorInput, supplyColorInput)
barcolor(color = pocCondition and close > open ? demandColorInput : pocCondition and open > close ? supplyColorInput : na)
If I remove some of the functionality to speed up the script, only checking for non crossed lines, it works without issue.
/#version=5
indicator("High Volume Candle Mid", overlay = true, max_lines_count = 100, max_labels_count = 100, max_bars_back = 5000)
maLengthInput = input.int(defval = 34, title = "Volume - Moving Average Length", group = "Options")
volLengthInput = input.int(defval = 5, title = "Volume - Look Back", group = "Options")
maMultiplierInput = input.float(defval = 2, title = "Volume - MA Multiplier", tooltip = "Filter's out weak volume candles that break MA", group = "Options")
qtyOfClosesInput = input.int(defval = 3, title = "(n) closes to cross POC to invalidate.", group = "Options")
qtyOfLinesInput = input.int(defval = 10, title = "(n) latest POC's to show", group = "Options")
qtyOfBrokenLinesInput = input.int(defval = 10, title = "(n) latest historical POC's to show", group = "Options")
barAlignInput = input.int(defval = 20, title = "Bar Index Offset", tooltip = "How many bars past price to extend labels/lines", group = "Options")
supplyColorInput = input.color(defval = #FF5252, title = "Supply Zone - POC's", group = "Options" )
demandColorInput = input.color(defval = #4CAF50, title = "Demand Zone - POC's", group = "Options")
///// Variables
var float maVol = na
var float highestVol = na
var bool pocCondition = false
var float[] barOpens = array.new_float()
var float[] barCloses = array.new_float()
var float[] barPocs = array.new_float()
var color[] barColors = array.new_color()
///// Functions
deleteLines() =>
a_allLines = line.all
if array.size(a_allLines) > 0
for i = 0 to array.size(a_allLines) - 1
line.delete(array.get(a_allLines, i))
deleteLabels() =>
a_allLabels = label.all
if array.size(a_allLabels) > 0
for i = 0 to array.size(a_allLabels) - 1
label.delete(array.get(a_allLabels, i))
createLines(arrayOfPocs, arrayOfOpens, arrayOfCloses, arrayOfColors, qtyOfCloses, maxLines, maxBrokenLines, barAlign, demandColor, supplyColor) =>
int qtyOfPocs = array.size(arrayOfPocs)
int supplyLinesCount = 0
int supplyBrokenLinesCount = 0
int demandLinesCount = 0
int demandBrokenLines = 0
float lastClose = close[1]
deleteLines()
deleteLabels()
for pocIndexNo = (qtyOfPocs > 1 ? qtyOfPocs - 1 : na) to 0
int supplyCloseCount = 0
int demandCloseCount = 0
bool supplyLineCrossed = false
bool demandLineCrossed = false
int barsSince = (bar_index - pocIndexNo) - 1
float barPoc = array.get(arrayOfPocs, pocIndexNo)
cColor = array.get(arrayOfColors, pocIndexNo)
//string supplyCrossedCloses = na
//string demandCrossedCloses = na
//if supplyLinesCount < maxLines or supplyBrokenLinesCount < maxBrokenLines
if barPoc > lastClose and barPoc > 0
if barsSince > 1
int lineIndex = (bar_index - barsSince) > (bar_index - 4999) ? (bar_index - barsSince) : bar_index - 4999
for indexNo = barsSince to 1
fClose = array.get(arrayOfCloses, indexNo)
fOpen = array.get(arrayOfOpens, indexNo)
if (fClose > barPoc and fOpen < barPoc) or (fClose < barPoc and fOpen > barPoc)
//supplyCrossedCloses := supplyCrossedCloses + "Crossed Count: " + str.tostring(supplyCloseCount) + "\n" + str.tostring(fClose) + " > " + str.tostring(barPoc) + " and " + str.tostring(fOpen) + " < " + str.tostring(barPoc) + " or " + str.tostring(fClose) + " < " + str.tostring(barPoc) + " and " + str.tostring(fOpen) + " > " + str.tostring(barPoc) + "\n"
supplyCloseCount := supplyCloseCount + 1
if (supplyCloseCount > qtyOfCloses)
supplyLineCrossed := true
// if supplyLineCrossed == true and supplyBrokenLinesCount < maxBrokenLines
// line.new(lineIndex, barPoc, bar_index + barAlign, barPoc, color = color.new(color.white, 50), style = line.style_dotted, width = 1, extend = extend.none)
// label.new(bar_index + barAlign, barPoc, text = str.tostring(barPoc) + " [" + str.tostring(lineIndex) + "]", textcolor = color.new(color.white, 50), textalign = text.align_right, style = label.style_none)
// supplyBrokenLinesCount := supplyBrokenLinesCount + 1
if supplyLineCrossed == false and supplyLinesCount < maxLines
//label.new(lineIndex, close + (supplyLines * 400), text = "barPoc: " + str.tostring(barPoc) + "\nsupplyLines: " + str.tostring(supplyLines) + "\nsupplyCloseCount: " + str.tostring(supplyCloseCount) + "\n" + supplyCrossedCloses, textcolor = color.aqua, style = label.style_label_down, color = color.new(color.white, 100))
line.new(lineIndex, barPoc, bar_index + barAlign, barPoc, color = cColor, style = line.style_dashed, width = 1, extend = extend.none)
label.new(bar_index + barAlign, barPoc, text = str.tostring(barPoc) + " [" + str.tostring(lineIndex) + "]", textcolor = cColor, textalign = text.align_right, style = label.style_none)
supplyLinesCount := supplyLinesCount + 1
///// Calculations
// Calculate moving average and highest volume bar in the last volLengthInput
maVol := ta.sma(volume, maLengthInput)
highestVol := ta.highest(volume, volLengthInput)
// Detect new POC Lines by finding vars that breached the Moving Average with Multiplier as well as being the most recent highest volume bar
pocCondition := (volume >= maVol * maMultiplierInput) and volume == highestVol
// Store bar POC's if poc condition is met, otherwise store nothing
if pocCondition
array.push(barPocs, (high + low)/2)
if close > open
array.push(barColors, demandColorInput)
else
array.push(barColors, supplyColorInput)
else
array.push(barPocs, 0)
array.push(barColors, na)
// Store opens/closes for later calculations to detect line crosses
array.push(barCloses, close)
array.push(barOpens, open)
// We don't want to calculate line breaches every bar as it would be too slow, so wait until its the last bar to look for POC's
if barstate.islast
aOpens = array.copy(barOpens)
aCloses = array.copy(barCloses)
array.reverse(aOpens)
array.reverse(aCloses)
createLines(barPocs, aOpens, aCloses, barColors, qtyOfClosesInput, qtyOfLinesInput/2, qtyOfBrokenLinesInput/2, barAlignInput, demandColorInput, supplyColorInput)
barcolor(color = pocCondition and close > open ? demandColorInput : pocCondition and open > close ? supplyColorInput : na)
Not sure what I am missing about the barstate.islast and how it affects series lengths that could be causing me issue. I stopped referencing bar_index in the arrays I was utilizing to find the historical Mids I needed, but I still use it to create lines. If this is not supported does anyone have a better idea for creating the lines? Or if there is some issue with creating lines under multiple conditionals?