Skip to main content

MQL5 indicator artifacts issue

MQL5 indicator buffer random values

During my coding of an indicator random values would end up in the index buffer if one would switch time frames.

It took me a few hours to figure out that if I didn't explicitly set an empty value this would cause this to happen - so the solution is to always set a value during your OnCalculate() loop both for your empty bars and not.

/*
OnCalculate
===========

Called only in custom indicators when it's necessary to calculate the indicator values by the Calculate event.
*/
int OnCalculate(const int iRatesTotal,
 const int iPreviousCalculated
 ,const datetime &time[]
 ,const double &aOpen[]
 ,const double &aHigh[]
 ,const double &aLow[]
 ,const double &aClose[]
 ,const long &tick_volume[]
 ,const long &volume[]
 ,const int &spread[])
 {
 Print(">>> OnCalculate(): `iRatesTotal=" + iRatesTotal + "`, `iPreviousCalculated=" + iPreviousCalculated + "`");
   
 
 //int iStart = (iPreviousCalculated == 0 ? 3 : iPreviousCalculated);
 for(int i=(iPreviousCalculated == 0 ? 3 : iPreviousCalculated-1); i < iRatesTotal;i++)
 {
  // must explicitly assign our EMPTY_VALUE
  aBufferBuyEP[i]=NULL;
  aBufferBuySL[i]=NULL;
  aBufferBuyTP[i]=NULL;

          ...

  }
 Print("<<< OnCalculate(): `iRatesTotal=" + iRatesTotal + "`");
  return(iRatesTotal);
}

Follow me on twitter @danielsokolows.

Comments

Popular posts from this blog

Opera SOCKS Proxy Setup Issues

SOCKS error: Connection closed by remote server When setting up SOCKS only proxy in Opera web browser make sure to specify the IP address instead of your fully qualified domain name (FQDN). Using a host name will not work and Opera simply fails to connect to the proxy server. Sample working setup screen shot with a Dante proxy server , note that HTTP, HTTPS, FTP, SSH options are left blank. Bug DSK-364301 has been filled with Opera, if it has been a while since this post and the issue still not fixed feel free to add your word of encouragement by emailing DSK-364301@bugs.opera.com :)

Storing passwords in PuTTY

How to save SSH username/password for auto login in PuTTy The answer is you can't do it...at least in plain PuTTy. However there is an awesome fork with that let's you store the username and password and other additional features called KiTTy.



So grab yourself a copy and +1 this if you do, thanks.

Duplicate value found: duplicates value on record with id: <unknown>.

System.DmlException: Insert failed. First exception on row 0; first error: DUPLICATE_VALUE, duplicate value found: <unknown> duplicates value on record with id: <unknown>.The above error is triggered in the database layer and caused by a trigger or workflow outside of your main code of block that is bubbling this exception. This is rather difficult to track down especially if you are unfamiliar with the code, I am sharing my procedure in the hopes this saves you time - if you find this helpful drop me a line or follow me on twitter @danielsokolows. This error is caused by unique field constraint on the object, so the first step is to examine the object and locate the API names of all unique fieds. You can do this through SF direclty 'Setup < Customize &lt <object being inserted> &lt Fields' or by downloading the `src/objects` metadata information and searching for <unique>; I preffer the latter and actually download ALL matadata information f…