MQL4 Learning - Page 34

Linuxser · #**331** (**permalink**) 03-19-2008, 09:14 AM

Quote:

Originally Posted by MANSTIR

do any source code is suitable on above calculations instead of mine?

please change anything inside the ea, please... i'm not a good programmer

thanks

here's the ea

Sorry, EA code? maybe here.

Auto pivot trade

Nudge · #**332** (**permalink**) 03-19-2008, 01:26 PM

Hi all,

I'm just learning MQL and would like to know the easiest way to find out if a trend is going long or short based on the last 2 bars.

For example, if the close price is 1.2345 for Close[2] and the close price is 1.2350 for Close[1], and the current Close price is 1.2360 for Close[0].

Would I do something like

if(Close[2] < Close[1] && Close[1] < Close[0]) {

}

and do the same for a down trend but reversed

Or is there a more professional way to do it.

Thanks for your help
Nudge

Devil2000 · #**333** (**permalink**) 03-19-2008, 06:45 PM

Quote:

Originally Posted by Nudge

Hi all,

I'm just learning MQL and would like to know the easiest way to find out if a trend is going long or short based on the last 2 bars.

For example, if the close price is 1.2345 for Close[2] and the close price is 1.2350 for Close[1], and the current Close price is 1.2360 for Close[0].

Would I do something like

if(Close[2] < Close[1] && Close[1] < Close[0]) {

}

and do the same for a down trend but reversed

Or is there a more professional way to do it.

Thanks for your help
Nudge

What do you mean by "professional way"?
Every coder has a different logic and different way to code their ideas.
And the simpler is better! I think your code is quiet simple, I don't know how to make it simpler.

DooMGuarD · #**334** (**permalink**) 03-19-2008, 06:55 PM

Quote:

Originally Posted by Linuxser

Yes of course.

Can calculate different arrays.

Something like:

well Linuxser... i have this idea for code

PHP Code:


			
int start()
{
  double A = iMAOnArray(GetArray(1),10,5,0,MODE_EMA,0);
  double B = iMAOnArray(GetArray(2),10,5,0,MODE_EMA,1);
  
  Print("A= ",A,"  B=",B);

  return(0);
}

double *GetArray(double Factor) // how to define a funcion return as array 
{
  double Arr[10];
  
  for(int i=0;i<10;i++) Arr[i] = i*Factor;
 
  return(Arr);
}

this code is possible?

if yes, think, a lot of way for systems....

regards

Linuxser · #**335** (**permalink**) 03-19-2008, 07:57 PM

Quote:

Originally Posted by DooMGuarD

well Linuxser... i have this idea for code

PHP Code:


			
int start()
{
  double A = iMAOnArray(GetArray(1),10,5,0,MODE_EMA,0);
  double B = iMAOnArray(GetArray(2),10,5,0,MODE_EMA,1);
  
  Print("A= ",A,"  B=",B);

  return(0);
}

double *GetArray(double Factor) // how to define a funcion return as array 
{
  double Arr[10];
  
  for(int i=0;i<10;i++) Arr[i] = i*Factor;
 
  return(Arr);
}

this code is possible?

if yes, think, a lot of way for systems....

regards

I´m not expert, just curious. I understand logic at the first part and it's ok.

For the second array...

ArraySetAsSeries?
ArrayGetAsSeries?

Nudge · #**336** (**permalink**) 03-19-2008, 09:50 PM

Quote:

Originally Posted by Nudge

Hi all,

I'm just learning MQL and would like to know the easiest way to find out if a trend is going long or short based on the last 2 bars.

For example, if the close price is 1.2345 for Close[2] and the close price is 1.2350 for Close[1], and the current Close price is 1.2360 for Close[0].

Would I do something like

if(Close[2] < Close[1] && Close[1] < Close[0]) {

}

and do the same for a down trend but reversed

Or is there a more professional way to do it.

Thanks for your help
Nudge

Quote:

Originally Posted by Devil2000

What do you mean by "professional way"?
Every coder has a different logic and different way to code their ideas.
And the simpler is better! I think your code is quiet simple, I don't know how to make it simpler.

I thought there may be a function already in MQL that does this and I have not found it yet.

Thanks for your reply, much appreciated.

Michel · #**337** (**permalink**) 03-19-2008, 09:57 PM

Quote:

Originally Posted by DooMGuarD

PHP Code:


			
double *GetArray(double Factor) // how to define a funcion return as array 

{

  double Arr[10];

  

  for(int i=0;i<10;i++) Arr[i] = i*Factor;

 

  return(Arr);

}

this code is possible?

if yes, think, a lot of way for systems....

regards

It seems easier to declare the array at global scoop, then any function can modify it. You also can pass the array to be modified to the fonction by reference using "&" :

PHP Code:


			
void MyFunc(double& Arr[])

DooMGuarD · #**338** (**permalink**) 03-19-2008, 11:41 PM

rigth Michel, but i don´t want to make an array to use in call arguments... i just need something similar to "series function" in an easy language...

Quote:

Originally Posted by easy language definition

Series function
A series function is a specialized function that refers to a previous function value within its calculations. In addition, series functions update their value on every bar even if the function call is placed within a conditional structure that may not be true on a given bar. Because a series function automatically stores its own previous values and executes on every bar, it allows you to write function calculations that may be more streamlined than if you had to manage all of the resources yourself. However, it's a good idea to understand how this might affect the performance of your EasyLanguage code.

The Function Properties - General tab is used to set the function storage and execution method to Series, Simple, or Auto-Detect. When in doubt, select Auto-Detect and the compiler will select the most appropriate storage method for the function.

Example
This one line series function adds the current bar Volume to the value of the function from the previous bar. Because a series function automatically updates on every bar, this makes it easy to write a function that maintains a running total.

VolTotal = VolTotal[1] + Volume;

see this code for EasyLanguage

PHP Code:


			
inputs:

  Price(Numeric), r(Numeric), s(Numeric), u(Numeric);



#EVENTS

OnDestroy = EasyLanguageRtlOnDestroy;

#END ;

PBF_AVG = XAverage(XAverage(XAverage(Price, r), s), u);

XAverage is defined as a "series function" (like recursive functions, but no equal) and generate a array as return type and will be used as argument in others functions....

if i make a return type as array i can translate EasyLanguage to MT easy...

NOTE: XAverage is a exponentially weighted moving average

star90 · #**339** (**permalink**) 03-24-2008, 08:19 PM

1) I am running mt4 with loops (in each loop I am assigning different values to variables and running again calculations)
2) After 20 loops I am getting values of 0 assigned to the variables instead of the values that I expect to receive and wrong calculation results.

What can be the reason? Is it because of memory and how can I release the memory in mt4 ?

timebandit · #**340** (**permalink**) 03-25-2008, 03:27 PM

Hi,
When an order is open it is assigned a ticket number. When this order is modified through an EA (i.e. the EA closes a portion of the trade) does the old ticket get changed to a new ticket number?
I'm still a rookie at all this programming stuff so any help is greatly appreciated.
Thanks
Bob

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Learning Cycles For New Traders	Dan7974	General Discussion	350	01-18-2008 06:04 PM
Learning to code for autotrading	GoatT	Metatrader Programming	8	01-10-2007 08:55 PM
Self learning expert	mrtools	Expert Advisors - Metatrader 4	32	10-22-2006 05:29 PM

Register in Forex TSD!
Trading Systems Leaders in this forum (automated trading systems) are winning more than 3000 pips in a month (30000$ investing one lot every time). Click here to register and get more information