Simple code is not executing trades on crossing of exponential moving averages

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Hello all,  I have a very simple code that uses exponential moving averages at 2 lengths.  When the shorter length crosses above the other then a long position is taken.  Sometimes it works.  That is ,when there is an obvious crossing I can see on the chart a long position is taken but at other obvious crossings a long position is not taken.  Do you think this is related to the code or is it possibly a computer speed/processor issue?  Any hints would be appreciated.

      double EMA11 = iMA_(Symbol(), Aggregation, EMAlength1, 0, MODE_EMA, PRICE_CLOSE, 1);
      double EMA21 = iMA_(Symbol(), Aggregation, EMAlength2, 0, MODE_EMA, PRICE_CLOSE, 1);
      double EMA12 = iMA_(Symbol(), Aggregation, EMAlength1, 0, MODE_EMA, PRICE_CLOSE, 2);
      double EMA22 = iMA_(Symbol(), Aggregation, EMAlength2, 0, MODE_EMA, PRICE_CLOSE, 2);
      
//Long EMA approach
      if (EMA11>EMA21)
      if (EMA12<EMA22)
      golongnew = true;
  
 
dclark24:

Hello all,  I have a very simple code that uses exponential moving averages at 2 lengths.  When the shorter length crosses above the other then a long position is taken.  Sometimes it works.  That is ,when there is an obvious crossing I can see on the chart a long position is taken but at other obvious crossings a long position is not taken.  Do you think this is related to the code or is it possibly a computer speed/processor issue?  Any hints would be appreciated.

Hi,

So sometime below condition may happen:

if (EMA11==EMA21)
      if (EMA12<EMA22)

or 

if (EMA11>EMA21)
      if (EMA12==EMA22)


So it could be :

if (EMA11>=EMA21)
      if (EMA12<EMA22)

or 

if (EMA11>EMA21)
      if (EMA12<=EMA22)

You can print the values which you see the crossing is happened,and see the exact condition.

  
double aPrev = …, aCurr = …,
       bPrev = …, bCurr = …;
bool   wasUp = aPrev > bPrev,
        isUp = aCurr > bCurr,
       isCross = isUp != wasUp;
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