Change Extern while EA is working

[sebastianhh]

Hi,

I have programed my EA and now I am optimising the settings. During live testing (real money, real time) I would like to change some setting in the EA that are adjustable during launch (extern int EMAperiod=21;) . Can I do that while it is working. e.g. I would like to change the EMA Period, TradeStopTime because the market has changed and an other settings are better. But I do not want to restart the MT4 or EA because it is working on other Instruments at the same time.

Best, Sebastian

[zzuegg]

Hi, if you change a setting only this EA get's restarted. if you have coded it properly it should not be a problem or affect other EA's.

//z

[gordon]

sebastianhh:
[...] During live testing (real money, real time) I would like to change some setting in the EA that are adjustable during launch (extern int EMAperiod=21;) . Can I do that while it is working. [...]

No problem, as long as your EA is designed to go through a deinit() -> init() -> start() cycle and continue working...

[[Deleted]]

gordon:
No problem, as long as your EA is designed to go through a deinit() -> init() -> start() cycle and continue working...

I want to my MA indicator to change its period automatically as per some conditions, it it possible?

[sebastianhh]

Jup,

now I got it. It works perfectly fine.

But what happens when I change the Timeframe. e.g. I have the EA running and it is suppose to do some action with the EMA70. Now I change the timeframe from M15 to M30. Does the EA calculates a new EMA70, now based on the new M30 timeframe or does it do the same action as it was launched in the M15 setting?

Thanks.

[zzuegg]

That depents if you call your indicator with Period() or PERIOD_M15

//z

[sebastianhh]

It is Period(). So it always uses the timeframe of the current chart?

[zzuegg]

sebastianhh:
It is Period(). So it always uses the timeframe of the current chart?

Correct

[William Roeder]

gordon:
No problem, as long as your EA is designed to go through a deinit() -> init() -> start() cycle and continue working...

Remember, that cycle does not modify or reset global/static variables. If you have code like

init(){
  if (Digits == 5) TP*=10;

then TP becomes 10x, 100x, ...

[sebastianhh]

I think it is fine like that.

extern int        MagicNumber=123456;
extern double     Lots=1;
extern int        Timeframe=0;
extern int        EMA_PeriodSlow=100;
extern double     SL_EMA_Buyfactor=0;
extern double     TP_EMA_Buyfactor=0;
extern double     SL_EMA_Sellfactor=0;
extern double     TP_EMA_Sellfactor=0;
extern string TradeStartTime ="00:00";
extern string TradeStopTime = "23:59";
string MagicNum;
bool   Trading_on_off  = true;
double places;
bool Close_at_EMA_break=true;


//*********************************************************************

int init(){
   if (Digits==3 || Digits==5) places=10.0; else places=1.0;
   return(0);

   return(0);
}
//*********************************************************************
int start(){
  
   if(TimeCurrent()>StrToTime(TradeStartTime) && TimeCurrent()<StrToTime(TradeStopTime)) Trading_on_off = true;

[AIRAT SAFIN]

Hi,

To control EA on the fly may be used "Global Variables" window.

See, for example:

AIS1 Advanced Indicator

AIS2 Trading Robot

AIS3 Trading Robot Template

AIS4 Trade Machine

AIS5 Trade Machine

Regards,

Airat