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  • #101
  • Nov 30, 2008 2:29am Nov 30, 2008 2:29am
One more thing. On your indicator. make 2 extern color varables. one for each of you movingaverages and the put the variable names where you have the color defined in your setindexstyle()

Somethig like

extern color MA1Color = Red;
and then aone for the second MA You choose the names and colors
  • #102
  • Nov 30, 2008 3:09am Nov 30, 2008 3:09am
Quoting smjones
One more thing. On your indicator. make 2 extern color varables. one for each of you movingaverages and the put the variable names where you have the color defined in your setindexstyle()

Somethig like

extern color MA1Color = Red;
and then aone for the second MA You choose the names and colors
I have done that now. I have also created an RSI indicator. How would you make an RSI indicator if you were not allowed to use the iRSI function. I have read that the formula for RSI is:

RSI = 100 – [100/1 +RS]
RS = Average of n periods closes up/Average of n periods closes down.

Attached is the indicator I made.
Attached File(s)
File Type: mq4 RSI1.mq4   2 KB | 479 downloads
If slaughterhouses had glass walls, everyone would be a vegetarian!
  • #103
  • Edited 10:36am Nov 30, 2008 9:44am | Edited 10:36am
Quoting Gambler180
I have done that now. I have also created an RSI indicator. How would you make an RSI indicator if you were not allowed to use the iRSI function. I have read that the formula for RSI is:

RSI = 100 – [100/1 +RS]
RS = Average of n periods closes up/Average of n periods closes down.

Attached is the indicator I made.
Well, I would write a function that performs the math that is in your formula.
It would involve a for loop that would be from 0 to n-1. The reason for 0 to n-1 and not 1 to n is because we need to look at the current close also which is the current bid and that is the bar[0].
So the for loop would look like

double rsi( int n)
{
int up=0, down=0, avgup, avgdown, RS, MyRSI;

for (int i = 0; i < n; i++ )
{
// then we would test if it is a up close by using something like
if ( Close[i] > Open[i] ) up++;
// then we would test if it is a down close by
if ( Close[i] < Open[i] ) down++;

}

// then I need to find the average of the up and down.
avgup = up/n;
avgdown = down/n;

// then I need to devide the avgup by the avgdown
RS = avgup/avgdown;

// You have written the equation wrong it should be, remember your order of precedence in algebra
// rsi = 100 - [100 / ( 1+RS)]
// so now the next step is
MyRSI = 100-(100/(1+RS));

// then you need to return the RSI so,

return(MyRSI);
}

Now if you wanted to be able to perform the operation on currencies that are not the current symbol() you would need to use iClose() and iOpen() instead of Close[] and Open[] and you would need a string parameter to hold the symbol you want like
double rsi(string pair, int n)
{
...
returnMyRSI);
}

Now if you want to ad the ability to change the time frame you need a timeframe parameter.
double rsi(string pair, int TimeFrame, int n)

Get the idea?

By the way, you asked earlier how do you express EURUSD in the iMA() when the chart is not on that pair. You always use "" (the string goes between the qoutes) to express a string and the Symbol() field of the iMA is a string variable as you can see by F1 the iMA so How would you write EURUSD in the symbol field?
  • #104
  • Nov 30, 2008 3:24pm Nov 30, 2008 3:24pm
I picked it up quickly also but I know a number of other languages.

If you don't know any programming language at all, I think it would be a hard place to start. If you were to learn, even, say, Visual Basic (which comes with your Windows platform and may come in handy if you want to write Excel functions or some such) it would speed up your learning curve later with MT4.

It would also be good to learn something like C or C++ or the C# that was mentioned earlier, as this language is also very fussy about matching brackets, and does not necessarily have good error messages when they do not match.

Bob "Sandy" Price
  • #105
  • Nov 30, 2008 3:43pm Nov 30, 2008 3:43pm
So, I think now we have the basics down for the indicator. You just need some practice. Here is an assingment. Write a few indicators that do different things. like maybe put a dot above the high or the low( use the DRAW_ARROW in style and also use SetIndexARROW(0, 170); or what ever wingding number you want to use.. and maybe write a indicator that takes the difference between two moving averages and plots them in a separate window, as an ocsillator. Something like
buffer1[i] = iMA1(...,i) - iMA2(...i);

Then in a day or so if you feel we are ready, we will move on to writing a EA based on the iCustom for your moving average indicator. Post your indicators please and we will talk about them. I will keep an eye on this thread for your responses.

Here is an example of using the SetIndexArrow()
Attached Image (click to enlarge)
Click to Enlarge Name: Wingdings MT4.GIF Size: 27 KB
Attached File(s)
File Type: mq4 Fractals_Adjustable_Lookback.mq4   2 KB | 439 downloads
  • #106
  • Dec 1, 2008 4:51am Dec 1, 2008 4:51am
Quoting smjones
Well, I would write a function that performs the math that is in your formula...
Okay. I will first try to understand the RSI indicator and then I will make some other indicators. It may take some time because I am in school for about 7 hours each day from monday to friday and when I come home from school there is homework and forex trading.
If slaughterhouses had glass walls, everyone would be a vegetarian!
  • #107
  • Dec 1, 2008 10:44am Dec 1, 2008 10:44am
I just found the answer to your question. I do it like this.
Buffer1[i] =iMA("EURUSD", 0, 10, 0, 3, PRICE_MEDIAN, i);

Now I will try to make an RSI indicator with the code you have given me.
If slaughterhouses had glass walls, everyone would be a vegetarian!
  • #108
  • Edited Dec 2, 2008 1:11am Dec 1, 2008 10:53am | Edited Dec 2, 2008 1:11am
Here is what I have until now. I get a "function definition unexpected" error. Should I rather attach the file instead of writing the code?

Inserted Code
#property copyright "Jimmi Andersen"
#property link "http://www.metaquotes.net"
#property indicator_separate_window
#property indicator_buffers 1
 
double buffer1;
//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
 
 
int init()
{
//---- indicators
SetIndexBuffer (0, buffer1);
SetIndexStyle (0, DRAW_LINE, 0, 2, Aqua);
//----
return(0);
}
//+------------------------------------------------------------------+
//| Custom indicator deinitialization function |
//+------------------------------------------------------------------+
int deinit()
{
//----
 
//----
return(0);
}
//+------------------------------------------------------------------+
//| Custom indicator iteration function |
//+------------------------------------------------------------------+
int start()
{
int counted_bars=IndicatorCounted();
//---- last counted bar will be recounted
if(counted_bars>0) counted_bars--;
double rsi(int 10)
 
//----
 
//----
return(0);
}
If slaughterhouses had glass walls, everyone would be a vegetarian!
  • #109
  • Dec 1, 2008 5:16pm Dec 1, 2008 5:16pm
Quoting Gambler180
Here is what I have until now. I get a "function definition unexpected" error. Should I rather attach the file instead of writing the code?

#property copyright "Jimmi Andersen"
#property link "http://www.metaquotes.net"
#property indicator_separate_window
#property indicator_buffers 1

double buffer1;
//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+


int init()
{
//---- indicators
SetIndexBuffer...
The reason is, you have not coded a function called rsi() outside of the start () in the global area... Go back and look at the function we wrote before... It is declared outside of the start and then is called by a variable in the start()

BTW
you would use something like

Buffer1[i] = rsi(period);

and in the global area, you would have a external like this

extern int period = 10; or what ever period you want

Then when you write the function and put it in the global area on this indicator, you would bring in the period integer with an input variable in your rsi function.

Something like this.
double rsi(int n)
{
double thereturnvariable;
your programming.
thereturnvariable = the culmination of your math programming;

return(thereturnvariable);
}

you see you are assigning the value that comes out of this function to a double variable in your for loop of your indicator. You are bringing in a int for period to the function. It left the start() as the variable called period and then was transfered to the variable called n, a local variable in your function called rsi().. then you did some math work using the input variable called n to control a for loop where you figured out how many up there were and how many downs there were. then after you did all the math required by your formula, you assinged thereturnvariable the value of the work you did. then you placed thereturnvariable in the return() statement to be sent back to the place that called it in this case the start() to be ssigned to a Buffer1[i]
  • #110
  • Dec 1, 2008 5:55pm Dec 1, 2008 5:55pm
I am confused now. Will you send an mql file with the code as it should be so I can go trough the code and explain what has been done?. I think it is easiest to learn it by going through an example line by line. When I have understood exactly how this is done without using the iRSI function I think I can start to make other kinds of indicators.
If slaughterhouses had glass walls, everyone would be a vegetarian!
  • #111
  • Dec 1, 2008 6:16pm Dec 1, 2008 6:16pm
Quoting Gambler180
I am confused now. Will you send an mql file with the code as it should be so I can go trough the code and explain what has been done?. I think it is easiest to learn it by going through an example line by line. When I have understood exactly how this is done without using the iRSI function I think I can start to make other kinds of indicators.
No problem, but I am trading right now.. so in a couple of hours, I will post it.
  • #112
  • Last Post: Dec 1, 2008 6:44pm Dec 1, 2008 6:44pm
It helps to use the code tags when posting codes, this preserves the indentation for easier reading.

Inserted Code
#property copyright "Jimmi Andersen"
#property link "[url]http://www.metaquotes.net[/url]"
#property indicator_separate_window
#property indicator_buffers 1
double buffer1;
//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
 
int init()
{
   //---- indicators
   SetIndexBuffer (0, buffer1);
   SetIndexStyle (0, DRAW_LINE, 0, 2, Aqua);
   //----
   return(0);
}
//+------------------------------------------------------------------+
//| Custom indicator deinitialization function |
//+------------------------------------------------------------------+
int deinit()
{
//----
//----
return(0);
}
//+------------------------------------------------------------------+
//| Custom indicator iteration function |
//+------------------------------------------------------------------+
int start()
{
   int counted_bars=IndicatorCounted();
   //---- last counted bar will be recounted
   if(counted_bars>0) counted_bars--;
//----
 
   // somewhere here you're going to call your rsi function.
   // this is just an example of how you're going to use it.
   double myRSIvalue = 0;
   myRSIvalue = rsi(10);
 
//----
   return(0);
}
double rsi(int some_value)
{
   //do something
}
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