Custom indicator keep duplicating itself

[Leo]

I've developed an Expert Advisor and calling a custom indicator using the iCustom function.

The indicator name is: (ROC) https://www.mql5.com/en/code/46

When I start the Tester it just keep repeating itself and I don't know why. 

Here where I call it:

double Roc()
{
  double RocArray[];
  int RocDef = iCustom(Symbol(),Period(),"roc.ex5",9);
  ArraySetAsSeries(RocArray,true);
  CopyBuffer(RocDef,0,0,3,RocArray);
  double roc = RocArray[0];
  return roc;
}

double PreRoc()
{
  double PreRocArray[];
  int PreRocDef = iCustom(Symbol(),Period(),"roc.ex5",9);
  ArraySetAsSeries(PreRocArray,true);
  CopyBuffer(PreRocDef,0,1,3,PreRocArray);
  double preroc = PreRocArray[0];
  return preroc;
}

I've attached an image to show what's happening here. 

Any thoughts?

[William Roeder]

Perhaps you should read the manual, especially the examples. They all (including iCustom) return a handle (an int.) You get that in OnInit. In OnTick (after the indicator has updated its buffers,) you use the handle, shift and count to get the data.
          Technical Indicators - Reference on algorithmic/automated trading language for MetaTrader 5
          Timeseries and Indicators Access / CopyBuffer - Reference on algorithmic/automated trading language for MetaTrader 5
          How to start with MQL5 - General - MQL5 programming forum - Page 3 #22 2020.03.08
          How to call indicators in MQL5 - MQL5 Articles 12 March 2010

[Vladimir Karputov]

Leo:
I've developed an Expert Advisor and calling a custom indicator using the iCustom function.

The indicator name is: (ROC) https://www.mql5.com/en/code/46

When I start the Tester it just keep repeating itself and I don't know why. 

Here where I call it:


I've attached an image to show what's happening here. 

Any thoughts?

Forum on trading, automated trading systems and testing trading strategies

Custom indicator and printing function to chart

Vladimir Karputov, 2020.06.19 04:45

Read help: iCustom

Please note: in MQL5, the indicator handle is created once (in OnInit). Then, to obtain the values, use CopyBuffer