How to Extract Wanted Symbols from a String Array? | Forex Factory

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How to Extract Wanted Symbols from a String Array?

  • #1
  • First Post: Edited 11:51am Feb 23, 2024 11:33am | Edited 11:51am
Hi coders, I have a list of 39 symbols in an array sym[39] :-

Inserted Code
string sym[39]={
"AUDCAD","AUDCHF","AUDJPY","AUDNZD","AUDSGD","AUDUSD","CADCHF","CADJPY","CHFJPY","EURAUD",
"EURCAD","EURCHF","EURGBP","EURJPY","EURNZD","EURUSD","GBPAUD","GBPCAD","GBPCHF","GBPJPY",
"GBPNZD","GBPUSD","NZDCAD","NZDCHF","NZDJPY","NZDUSD","USDCAD","USDCHF","USDJPY","XAGAUD",
"XAGEUR","XAGUSD","XAUAUD","XAUCHF","XAUEUR","XAUGBP","XAUJPY","XAUUSD","XTIUSD"};
// including 9 Metal Pairs

Now, I would like to get an auto-way or a loop to EXCLUDE all the metal pairs by filtering out with such condition :-

Inserted Code
StringSubstr(sym[i],0,3)!="XAG" && StringSubstr(sym[i],0,3)!="XAU"

The final output of extracted non-metal nonMetSym[30] should be as follows :-

Inserted Code
string nonMetSym[30]={
"AUDCAD","AUDCHF","AUDJPY","AUDNZD","AUDSGD","AUDUSD","CADCHF","CADJPY","CHFJPY","EURAUD",
"EURCAD","EURCHF","EURGBP","EURJPY","EURNZD","EURUSD","GBPAUD","GBPCAD","GBPCHF","GBPJPY",
"GBPNZD","GBPUSD","NZDCAD","NZDCHF","NZDJPY","NZDUSD","USDCAD","USDCHF","USDJPY","XTIUSD"};
// Non-Metal Pairs

Please help to guide me the correct way, thanks
  • #2
  • Feb 25, 2024 2:19am Feb 25, 2024 2:19am
Inserted Code
string sym[39]={
"AUDCAD","AUDCHF","AUDJPY","AUDNZD","AUDSGD","AUDUSD","CADCHF","CADJPY","CHFJPY","EURAUD",
"EURCAD","EURCHF","EURGBP","EURJPY","EURNZD","EURUSD","GBPAUD","GBPCAD","GBPCHF","GBPJPY",
"GBPNZD","GBPUSD","NZDCAD","NZDCHF","NZDJPY","NZDUSD","USDCAD","USDCHF","USDJPY","XAGAUD",
"XAGEUR","XAGUSD","XAUAUD","XAUCHF","XAUEUR","XAUGBP","XAUJPY","XAUUSD","XTIUSD"};
string nonMetSym[];  //this is where the results will go
//+------------------------------------------------------------------+
//| Script program start function                                    |
//+------------------------------------------------------------------+
void OnStart()
  {
//---
   int new_counter=0; //counter for the new array
   for(int x = 0;x<=ArraySize(sym)-1;x++){//lets loop through the original array
      if(StringFind(sym[x],"XA")>-1)continue;//if symbol is a metal move on to next symbol
      ArrayResize(nonMetSym,ArraySize(nonMetSym)+1);//resize the nonMetSym array to current size + 1 so we can add another symbol
      nonMetSym[new_counter] = sym[x];//write the symbol into the nonMetSym array
      new_counter++;//don't forget to increase the counter for the nonMetSym array
   }
   for(int y=0;y<=ArraySize(nonMetSym)-1;y++)//lets print out the results array to show it works
      Print(nonMetSym[y]);
  }
//+------------------------------------------------------------------+
  • #3
  • Edited 10:04am Feb 27, 2024 9:25am | Edited 10:04am
Quoting kennyhubbard
string sym[39]={ "AUDCAD","AUDCHF","AUDJPY","AUDNZD","AUDSGD","AUDUSD","CADCHF","CADJPY","CHFJPY","EURAUD", "EURCAD","EURCHF","EURGBP","EURJPY","EURNZD","EURUSD","GBPAUD","GBPCAD","GBPCHF","GBPJPY", "GBPNZD","GBPUSD","NZDCAD","NZDCHF","NZDJPY","NZDUSD","USDCAD","USDCHF","USDJPY","XAGAUD", "XAGEUR","XAGUSD","XAUAUD","XAUCHF","XAUEUR","XAUGBP","XAUJPY","XAUUSD","XTIUSD"}; string nonMetSym[]; //this is where the results will go //+------------------------------------------------------------------+ //| Script program start function | //+------------------------------------------------------------------+...
Thanks Kenny. I learn arrays for more than 2 years, only now can gradually pick-up the knowledge .

The only matter is I don't know putting the ArrayResize and ArraySize inside the loop, now with your sample, I learn something today. I'll test more.

Currently, I'm always facing "array out of range", always need to count the correct number of bars. Don't know is there any shortcut (automatic) ways to deal with such warning.
  • #4
  • Last Post: Feb 27, 2024 11:41am Feb 27, 2024 11:41am
Quoting chimoong
{quote} I'm always facing "array out of range", always need to count the correct number of bars. Don't know is there any shortcut (automatic) ways to deal with such warning.
Just remember that an array starts from 0 not 1. When you get the array out of range error, it generally means you got the numbering wrong; So in your array that consists of 30 elements, the last element is at sym[29] not at sym[30]
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