關於“不能使用可變變量作為安全 function 的參數。”

Question

//@version=4
strategy(title="test_rukia", shorttitle="test_rukia")

atrLookback = 12
atrMultiplier = 1.3
atrTrailMode = 'Trailing'
atrFlipInput = "Close"
dummy2 = false
atrBodyPercent = 100
atrWickPercent = 100
atrSmoothingMode = "RMA"


// ============================== CALCULATE ATR ==================================

f_ma(_source, _length, _atrSmoothingMode) => rma(_source, _length)


atrBodyTrueRange = max(abs(open - close), abs(open - close[1]), abs(close - close[1]))
atrWickTrueRange = (high - max(open,close)) + (min(open,close))-low
atrPercentAdjustedTrueRange = (atrBodyTrueRange*(atrBodyPercent/100))+(atrWickTrueRange*(atrWickPercent/100))

atrValue = f_ma(atrPercentAdjustedTrueRange,atrLookback,atrSmoothingMode)
atrMultiplied = atrValue * atrMultiplier

// Plot the price plus or minus the ATR
atrLow = low - atrMultiplied
atrHigh = high + atrMultiplied


// ============================== CALCULATE TRAILING ATR ==================================

f_trail(_source, _trail, _direction) =>
    // This function trails the source series up or down
    _direction == "down" and _source >= _trail ? _trail : _direction == "up" and _source <= _trail ? _trail : _source

// Need to declare these variables here, in the global scope, so we can use them in other functions later
var float trailAtrLong = atrLow
var float trailAtrShort = atrHigh

// Trail the high (short) stop down and the low (long) stop up
trailAtrLong := f_trail(atrLow, trailAtrLong, "up")
trailAtrShort := f_trail(atrHigh, trailAtrShort, "down")


// ============================== FLIP WHEN PRICE CROSSES ==================================

f_flip(_flipInput, _longTrail, _shortTrail, _longReset, _shortReset) =>
    // These variables say whether we are flipping long or short this very bar. Usually they are both false. Only one of them can be true at once.
    var bool _flipLongNow = false
    var bool _flipShortNow = false
    // These variables say what state we're in: long or short. One or both are always true.
    // In the beginning, we haven't hit any trails yet, so we start off both long and short, to display both lines.
    var bool _isLong = true
    var bool _isShort = true
    // Get the source, depending whether it's on close or on touch
    float _flipLongSource = _flipInput == "Close" ? close : _flipInput == "Wick" ? high : na
    float _flipShortSource = _flipInput == "Close" ? close : _flipInput == "Wick" ? low : na
    // Are we flipping long or short this bar?
    _flipLongNow := _isShort[1] and _flipLongSource > _shortTrail ? true : false
    _flipShortNow := _isLong[1] and _flipShortSource < _longTrail ? true : false
    // In the edge case where we manage to flip both long and short, we need to reset that based on the close. The close is definitive for history and intra-candle it will take the current value.
    _flipLongNow := _flipShortNow and _flipLongNow and close > _longTrail ? true :  _flipShortNow and _flipLongNow and close <= _longTrail ? false : _flipLongNow
    _flipShortNow := _flipLongNow and _flipShortNow and close < _shortTrail ? true : _flipShortNow and _flipLongNow and close >= _shortTrail ? false : _flipShortNow 
    // Set the long and short state variables. Set if we flip (simple), initialise to true if this is the first time (needed), otherwise persist.
    _isLong := _flipLongNow ? true : _flipShortNow ? false : na(_isLong[1]) ? true : _isLong[1]
    _isShort := _flipShortNow ? true : _flipLongNow ? false : na(_isShort[1]) ? true : _isShort[1]
    // Update the trailing price. If we flip this bar, reset to the nearest fractal - which goes against the trail direction, which is why we need to use another series.
    _longTrailOutput = _longTrail
    _shortTrailOutput = _shortTrail
    _longTrailOutput := _isLong and not _isLong[1] ? _longReset : _longTrailOutput
    _shortTrailOutput := _isShort and not _isShort[1] ? _shortReset : _shortTrailOutput
    // Hide the trailing long stop if we are short, and hide the trailing short stop if we are long. Show both if we are both long and short. 
    float _longTrailPlot = _isLong ? _longTrailOutput : _isLong and _isShort ? _longTrailOutput : na
    float _shortTrailPlot = _isShort ? _shortTrailOutput : _isLong and _isShort ? _shortTrailOutput: na
    [_longTrailOutput, _shortTrailOutput, _longTrailPlot, _shortTrailPlot]




// Get the plots for the trails, to show only long stop when long and short stop when short.
[trailAtrLongTemp, trailAtrShortTemp, trailAtrLongPlot, trailAtrShortPlot] = 
  f_flip(atrFlipInput, trailAtrLong, trailAtrShort, atrLow, atrHigh)


// Put these variables back in the global scope so we can persist them and use them as inputs to the function next bar. 
trailAtrLong := trailAtrLongTemp
trailAtrShort := trailAtrShortTemp

test=security(syminfo.tickerid, '1', trailAtrLongPlot)
plot(test)

關於測試的內容，錯誤提示我'Cannot use a mutable variable as a argument of the security function'。 我知道是因為在安全function中用到了變量，但是查了很多資料還是不會修改。

有一刻，我的呼吁是獲取分鍾級別的 trailAtrLongPlot 數據。 貌似只有安全function可以實現，但現在代碼無法運行。

Answer 1

可變變量是通過:=運算符重寫的變量。 它們不能在security() function 中使用。 在您的情況下，您將其中兩個and傳遞給f_flip function，這會導致問題。 快速修復是在 function 本身內部創建和重新分配此變量（為了個人方便，我在檢查時將代碼轉換為 v5，修復在 v4 中類似）：

//@version=5
strategy(title="test_rukia", shorttitle="test_rukia")

atrLookback = 12
atrMultiplier = 1.3
atrTrailMode = 'Trailing'
atrFlipInput = "Close"
dummy2 = false
atrBodyPercent = 100
atrWickPercent = 100
atrSmoothingMode = "RMA"


// ============================== CALCULATE ATR ==================================

f_ma(_source, _length, _atrSmoothingMode) => ta.rma(_source, _length)


atrBodyTrueRange = math.max(math.abs(open - close), math.abs(open - close[1]), math.abs(close - close[1]))
atrWickTrueRange = (high - math.max(open,close)) + (math.min(open,close))-low
atrPercentAdjustedTrueRange = (atrBodyTrueRange*(atrBodyPercent/100))+(atrWickTrueRange*(atrWickPercent/100))

atrValue = f_ma(atrPercentAdjustedTrueRange,atrLookback,atrSmoothingMode)
atrMultiplied = atrValue * atrMultiplier

// Plot the price plus or minus the ATR
atrLow = low - atrMultiplied
atrHigh = high + atrMultiplied


// ============================== CALCULATE TRAILING ATR ==================================

f_trail(_source, _trail, _direction) =>
    // This function trails the source series up or down
    _direction == "down" and _source >= _trail ? _trail : _direction == "up" and _source <= _trail ? _trail : _source


// ============================== FLIP WHEN PRICE CROSSES ==================================

f_flip(_flipInput, _longReset, _shortReset) =>
    // Need to declare these variables here, in the global scope, so we can use them in other functions later
    var float trailAtrLong = atrLow
    var float trailAtrShort = atrHigh
    
    // Trail the high (short) stop down and the low (long) stop up
    trailAtrLong := f_trail(atrLow, trailAtrLong, "up")
    trailAtrShort := f_trail(atrHigh, trailAtrShort, "down")

    
    // These variables say whether we are flipping long or short this very bar. Usually they are both false. Only one of them can be true at once.
    var bool _flipLongNow = false
    var bool _flipShortNow = false
    // These variables say what state we're in: long or short. One or both are always true.
    // In the beginning, we haven't hit any trails yet, so we start off both long and short, to display both lines.
    var bool _isLong = true
    var bool _isShort = true
    // Get the source, depending whether it's on close or on touch
    float _flipLongSource = _flipInput == "Close" ? close : _flipInput == "Wick" ? high : na
    float _flipShortSource = _flipInput == "Close" ? close : _flipInput == "Wick" ? low : na
    // Are we flipping long or short this bar?
    _flipLongNow := _isShort[1] and _flipLongSource > trailAtrShort ? true : false
    _flipShortNow := _isLong[1] and _flipShortSource < trailAtrLong ? true : false
    // In the edge case where we manage to flip both long and short, we need to reset that based on the close. The close is definitive for history and intra-candle it will take the current value.
    _flipLongNow := _flipShortNow and _flipLongNow and close > trailAtrLong ? true :  _flipShortNow and _flipLongNow and close <= trailAtrLong ? false : _flipLongNow
    _flipShortNow := _flipLongNow and _flipShortNow and close < trailAtrShort ? true : _flipShortNow and _flipLongNow and close >= trailAtrShort ? false : _flipShortNow 
    // Set the long and short state variables. Set if we flip (simple), initialise to true if this is the first time (needed), otherwise persist.
    _isLong := _flipLongNow ? true : _flipShortNow ? false : na(_isLong[1]) ? true : _isLong[1]
    _isShort := _flipShortNow ? true : _flipLongNow ? false : na(_isShort[1]) ? true : _isShort[1]
    // Update the trailing price. If we flip this bar, reset to the nearest fractal - which goes against the trail direction, which is why we need to use another series.
    _longTrailOutput = trailAtrLong
    _shortTrailOutput = trailAtrShort
    _longTrailOutput := _isLong and not _isLong[1] ? _longReset : _longTrailOutput
    _shortTrailOutput := _isShort and not _isShort[1] ? _shortReset : _shortTrailOutput
    // Hide the trailing long stop if we are short, and hide the trailing short stop if we are long. Show both if we are both long and short. 
    float _longTrailPlot = _isLong ? _longTrailOutput : _isLong and _isShort ? _longTrailOutput : na
    float _shortTrailPlot = _isShort ? _shortTrailOutput : _isLong and _isShort ? _shortTrailOutput: na
    [_longTrailOutput, _shortTrailOutput, _longTrailPlot, _shortTrailPlot]




// Get the plots for the trails, to show only long stop when long and short stop when short.

// Put these variables back in the global scope so we can persist them and use them as inputs to the function next bar. 
// trailAtrLong := trailAtrLongTemp
// trailAtrShort := trailAtrShortTemp

[trailAtrLongTemp, trailAtrShortTemp, trailAtrLongPlot, trailAtrShortPlot] = request.security(syminfo.tickerid, '1', f_flip(atrFlipInput, atrLow, atrHigh))
plot(trailAtrLongPlot)