Mql5 error when use vector::Sort. It is a bug !!!

[Huy Nguyễn]

Hello guys, 

I have a problem when try to use example for vector::Sort at https://www.mql5.com/en/docs/matrix/matrix_manipulations/matrix_sort

when I compile it said error that:

'Sort' is not a member of 'vector' type

I try some another ways but still don't know the way to use Sort method

Can you give me some correct example for vector::Sort? (also for matrix::Sort)

I use MetaTrader 5 build 4153, updated at 22 Jan 2024

Thank you,

Momoinu

[Dominik Egert]

Huy Nguyễn:

Hello guys, 

I have a problem when try to use example for vector::Sort at https://www.mql5.com/en/docs/matrix/matrix_manipulations/matrix_sort

when I compile it said error that:

I try some another ways but still don't know the way to use Sort method

Can you give me some correct example for vector::Sort? (also for matrix::Sort)

I use MetaTrader 5 build 4153, updated at 22 Jan 2024

Thank you,

Momoinu

Documentation gives an example, doesn't that work?

Please always provide compilable code to reproduce the issue you are reporting.

[Huy Nguyễn]

Dominik Egert #:

Documentation gives an example, doesn't that work?

Please always provide compilable code to reproduce the issue you are reporting.

Hello sir,

I try to use code from Documentation but it not work, I also attached an image that show my code and the error in MetaEditor UI.

Here is detail code:

//+------------------------------------------------------------------+
//|                                                       TestHi.mq5 |
//|                                                          Momoinu |
//|                                         [e-mail] |
//+------------------------------------------------------------------+
#property copyright "Momoinu"
#property link      "[e-mail]"
#property version   "1.00"

//+------------------------------------------------------------------+

//+------------------------------------------------------------------+
//| Sort function                                                    |
//+------------------------------------------------------------------+
int MyDoubleComparator(double x1,double x2,int sort_mode=0)
  {
   int res=x1<x2 ? -1 : (x1>x2 ? 1 : 0);
   return(sort_mode==0 ? res : -res);
  }
//+------------------------------------------------------------------+
//| Script start function                                            |
//+------------------------------------------------------------------+
void OnStart()
  {
   //--- fill the vector
   vector v(100);
   //--- sort ascending
   v.Sort(MyDoubleComparator);   // an additional parameter with the default value '0' is used here
   Print(v);
   // sort descending
   v.Sort(MyDoubleComparator,1); // here the additional parameter '1' is explicitly specified by the user
   Print(v);
  }

can you try it?

Thank you

[Lorentzos Roussos]

I think it is not implemented yet 

try this :

void init_and_sort(vector &to_initialize,double &values[],ENUM_SORT_MODE mode){
ArraySort(values);
if(mode==SORT_DESCENDING){ArrayReverse(values,0,ArraySize(values));}
for(int i=0;i<ArraySize(values);i++){to_initialize[i]=values[i];}
}
//+------------------------------------------------------------------+
//| Script start function                                            |
//+------------------------------------------------------------------+
int OnInit()
  {
  double the_values[]={0.1,0.22,0.03,1.1,-0.4};
  vector v(ArraySize(the_values),init_and_sort,the_values,SORT_DESCENDING);
  Print(v);
  //--- fill the vector
   /*
   vector v(100);
   
   //--- sort ascending
   v.Sort(MyDoubleComparator);   // an additional parameter with the default value '0' is used here
   Print(v);
   // sort descending
   v.Sort(MyDoubleComparator,1); // here the additional parameter '1' is explicitly specified by the user
   Print(v);
   */
  return(INIT_SUCCEEDED);
  }

[Huy Nguyễn]

Lorentzos Roussos #:

I think it is not implemented yet 

try this :

Hello sir,

This work for me, thank you :D

Also I thought that I can ask ChatGPT to dev the Sort func for vector, that I forgot before =)))

[amrali]

I wonder why to add documentations for functions that aren't implemented yet 🤔 

[Lorentzos Roussos]

amrali #:
I wonder why to add documentations for functions that aren't implemented yet 🤔 

its like a whitepaper , or a roadmap . Invest while its early

Huy Nguyễn #:

Hello sir,

This work for me, thank you :D

Also I thought that I can ask ChatGPT to dev the Sort func for vector, that I forgot before =)))

you are welcome 

[Huy Nguyễn]

amrali #:
I wonder why to add documentations for functions that aren't implemented yet 🤔 

me too, that make me feel surprise then I forgot we can easy develop this, instead of try to understand