Lesson 14 - Your First Expert Advisor (Part 2)

codersguru · #1 (**permalink**) 12-01-2005, 06:42 PM

Hi folks,

Welcome to the second part of creating Your First Expert Advisor lesson.
In the previous part we have taken the code generated by the new program wizard and added our own code which we are going to crack it today line by line.

Did you wear your coding gloves? Let’s crack.

Note: I have to repeat that our expert advisor is for educational purpose only and will not (or aimed to) make profits.

Why don't download the lesson and enjoy it (I hope)?

fubifx · #2 (**permalink**) 12-01-2005, 08:12 PM

finally the part 2 is out, thank you very much.

have been waiting for a life time

codersguru · #3 (**permalink**) 12-01-2005, 10:11 PM

Quote:

Originally Posted by fubifx

finally the part 2 is out, thank you very much.

have been waiting for a life time

fubifx,

I'm so sorry for the delay.

I have a damn car that I spent the most of my time repairing it.

If you lend me your car, maybe I write the lesson everyday

barry · #4 (**permalink**) 12-02-2005, 03:17 AM

Quote:

Stop losses points are always set above the current asking price on a buy or below the current bid price on a sell.

I believe that should be "Stop losses are always set BELOW the current bid price on a buy and ABOVE the current asking price on a sell"

Question: Why is the line

Code:

int Crossed (double line1 , double line2)

positioned where it is, i.e., after the expert deinitialization function and before the expert start function?

Thanks again for a great course!

codersguru · #5 (**permalink**) 12-02-2005, 11:53 AM

Quote:

Originally Posted by barry

I believe that should be "Stop losses are always set BELOW the current bid price on a buy and ABOVE the current asking price on a sell"

Hi Barry,

You are right!

I'll change that.

Quote:

Originally Posted by barry

Question: Why is the line

Code:

int Crossed (double line1 , double line2)

positioned where it is, i.e., after the expert deinitialization function and before the expert start function?
Thanks again for a great course!

int Crossed (double line1 , double line2)

The above line is the function declaration
It means we want to create Crossed function which takes two double data type parameters and returns an integer.

When you call this function you have to pass to it two double parameters and it will return an integer to you.

Code:

 shortEma = iMA(NULL,0,8,0,MODE_EMA,PRICE_CLOSE,0);
   longEma = iMA(NULL,0,13,0,MODE_EMA,PRICE_CLOSE,0);
   
   int isCrossed  = 0;
   isCrossed = Crossed (shortEma,longEma);

You have to declare the function before using (calling) it. The place of the function doesn't matter, I placed it above start() function, but you can place it anywhere else.

zhu28ming · #6 (**permalink**) 12-11-2005, 04:37 AM

Can we download all the lessons?

Thanks al lot

codersguru · #7 (**permalink**) 12-13-2005, 12:29 PM

Quote:

Originally Posted by zhu28ming

Can we download all the lessons?

Thanks al lot

zhu28ming,

You will find a list with all the lessons here:
http://www.forex-tsd.com/showpost.ph...6&postcount=20

dr_richard_gaines · #8 (**permalink**) 05-01-2006, 04:59 PM

Hi
Code Guru

How do we make a indicator into a expert ?

Doc

iincome · #9 (**permalink**) 06-09-2006, 05:41 PM

The program is running all the time? i mean so i can save the info in an array between every tick?

And the "int start()" function runs once for every tick?

Thanks in advance iincome

BoDar · #10 (**permalink**) 06-20-2006, 01:04 AM

Please for the help: how to add to Expert Advisor pointers (arrows) showing coming into being of trading conditions (but not the concrete transaction!). This would be very useful for the purpose of the visual presentation of the rightness of the prompt from the EA under of tests before transactions.

I know that one can add pointers to indicators using code:

//---- indicator line
IndicatorBuffers(2);
SetIndexStyle(0,DRAW_ARROW);
SetIndexArrow(0,233);
SetIndexStyle(1,DRAW_ARROW);
SetIndexArrow(1,234);
........
But what to make, if EA uses with several indicators. Then pointers would be added to EA code. Please for the help how can I make this.