[英]How to stop Indicator from calculating on every tick, when I only need the indicator at bar close?
這是我從互聯網上下載的指標,但是我做了一些修改。 我注意到該指標計算線性回歸線以及每個刻度線的上下頻帶。
我發現這很浪費資源,因為我只需要在每個小節的末尾計算行; 即,當小節0結束並形成新的小節0時。
條0仍不完整時,它不應計算任何內容。
我如何進行必要的更改?
謝謝!!
//+------------------------------------------------------------------+
//| Linear Regression Line.mq4 |
//| MQL Service |
//| scripts@mqlservice.com |
//+------------------------------------------------------------------+
#property copyright "MQL Service"
#property link "www.mqlservice.com"
#property indicator_chart_window
#property indicator_buffers 3
#property indicator_color1 White
#property indicator_width1 2
#property indicator_color2 Orange
#property indicator_width2 2
#property indicator_color3 Orange
#property indicator_width3 2
//---- input parameters
extern int LRLPeriod = 20;
extern int Number_SD = 2;
//---- buffers
double LRLBuffer[], LRLBuffer_Upper[], LRLBuffer_Lower[];
//int shift = 0;
int n = 0;
double sumx = 0;
double sumy = 0;
double sumxy = 0;
double sumx2 = 0;
double sumy2 = 0;
double yint = 0;
double r = 0;
double m = 0;
//+------------------------------------------------------------------+
//| INITIALIZATION FUNCTION |
//+------------------------------------------------------------------+
int init()
{
//---- indicators
SetIndexStyle(0, DRAW_LINE);
SetIndexBuffer(0, LRLBuffer);
SetIndexStyle(1, DRAW_LINE);
SetIndexBuffer(1, LRLBuffer_Upper);
SetIndexStyle(2, DRAW_LINE);
SetIndexBuffer(2, LRLBuffer_Lower);
IndicatorDigits(Digits);
if (LRLPeriod < 2)
LRLPeriod = 2;
IndicatorShortName("Linear Regression Line ("+LRLPeriod+")");
SetIndexDrawBegin(0, LRLPeriod+2);
IndicatorDigits(MarketInfo(Symbol(), MODE_DIGITS)+4);
return(0);
}
//+------------------------------------------------------------------+
//| DEINITIALIZATION FUNCTION |
//+------------------------------------------------------------------+
int deinit()
{
return(0);
}
//+------------------------------------------------------------------+
//| ITERATION FUNCTION |
//+------------------------------------------------------------------+
int start()
{
int limit, j, Counted_bars;
int counted_bars = IndicatorCounted();
if (counted_bars < 0)
counted_bars = 0;
if (counted_bars > 0)
counted_bars--;
limit = Bars - counted_bars;
for (int shift=limit-1; shift >= 0; shift--)
{
sumx = 0;
sumy = 0;
sumxy = 0;
sumx2 = 0;
sumy2 = 0;
for (n = 0; n <= LRLPeriod-1; n++)
{
sumx = sumx + n;
sumy = sumy + Close[shift + n];
sumxy = sumxy + n * Close[shift + n];
sumx2 = sumx2 + n * n;
sumy2 = sumy2 + Close[shift + n] * Close[shift + n];
}
double temp = LRLPeriod * sumx2 - sumx * sumx;
if (temp == 0)
temp = .0000001;
// m = (LRLPeriod * sumxy - sumx * sumy) / (LRLPeriod * sumx2 - sumx * sumx);
m = (LRLPeriod * sumxy - sumx * sumy) / temp;
temp = LRLPeriod;
if (temp == 0)
temp = .0000001;
yint = (sumy + m * sumx) / temp; // was LRLPeriod (obviously)
temp = MathSqrt((LRLPeriod * sumx2 - sumx * sumx) * (LRLPeriod * sumy2 - sumy * sumy));
if (temp == 0)
temp = .0000001;
r = (LRLPeriod * sumxy - sumx * sumy) / temp;
LRLBuffer[shift] = yint - m * LRLPeriod;
//Print (" "+shift+" "+LRLBuffer[shift]);
}
//----------Added Upper and Lower Bands--------------//
int nBARs = 0;
double LRLBuffer_CPY[];
ArraySetAsSeries(LRLBuffer_CPY,True);
j = Bars - Counted_bars - 1;
while( j > 0 )
{
ArrayCopy( LRLBuffer_CPY, LRLBuffer, 0, j, WHOLE_ARRAY );
double StDev = iStdDevOnArray( LRLBuffer_CPY, nBARs, LRLPeriod, 0, MODE_SMA, 0 );
LRLBuffer_Upper[j] = LRLBuffer[j] + (Number_SD * StDev);
LRLBuffer_Lower[j] = LRLBuffer[j] - (Number_SD * StDev);
j--;
}
return(0);
}
//+------------------------------------------------------------------+
最簡單的方法是使用標准的OnCalculate(***)
函數並僅if(rates_total>prev_calculated)
運行主循環。
另外,在主循環中,嘗試使for(int shift=limit-1;shift>0;shift--){
(注意),順便說一句,您確定需要shift=limit-1
而不只是shift=limit
?
MQL4
語法OnCalculate()
將不利於實現這一目標, 可以使用OnCalculate()
語法,但是代碼塊實際上在您的控制之外,在啟動時以及允許其處理多少個逐步步驟的情況下,都OnCalculate()
您控制。
解決方案是使用“舊”語法並添加“軟”鎖定。
如果使用移位寄存器只是從剛凍結的[1]小節進行更新,則使用static
變量有助於將臨時值存儲在調用之間,並且剛好進行熱端重新計算,因此無需從整個深度重新進行迭代。 Bar [0]持續時間的其余部分都執行.NOP / JIT / RET,並且您的代碼不會破壞由所有自定義指標共享(是!共享!)的單線程性能的脆弱性(真正的惡魔般的反-New New-MQL4更新中的模式...):
int start(){
static aCurrentTIME = EMPTY;
if ( aCurrentTIME == Time[0] ) return 0; // .NOP/JIT/RET --^
aCurrentTIME = Time[0]; // .MOV/LOCK
// -------------------------------------------- // .CALC:
int limit = Bars - counted_bars;
...
/* update just the "HOT"-end has just got into OHLCVT[1]-cells */
// -------------------------------------------- // .FIN
}
根據情況,您還可以:
datetime calculatedBarTime;
void OnCalculate()
{
if ( calculatedBarTime != Time[0] )
{
onBar();
}
}
void onBar()
{
calculatedBarTime = Time[0];
// on bar logic....
}
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