Problem getting values from array - page 2

New comment
 
Hi Rosh,

Thank you for your clarification. It is most helpful.

Can you please confirm that, as implied by the examples and documentation, assigning a value to an array element beyond the existing array bounds automatically resizes the array.

Regards,

Mobius
 
Well, I shall give an example tomorrow (same your code).
 
As well as promised, I publish an example. This expert adviser (EA) illustrates a life of a array between changes of the price (between ticks).
//+------------------------------------------------------------------+
//|                                     CheckArraysExpertAdvisor.mq4 |
//|                      Copyright © 2007, MetaQuotes Software Corp. |
//|                                        http://www.metaquotes.net |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2007, MetaQuotes Software Corp."
#property link      "http://www.metaquotes.net"

//+------------------------------------------------------------------+
//| expert initialization function                                   |
//+------------------------------------------------------------------+
int init()
  {
//----
   
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| expert deinitialization function                                 |
//+------------------------------------------------------------------+
int deinit()
  {
//----
   
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| expert start function                                            |
//+------------------------------------------------------------------+
int start()
  {
//----
   double testArray[];
   datetime currTime=TimeCurrent();
   string timeinstring=DoubleToStr(currTime,0);
   string oldArray,newArray;
   int i,lastDigit=StrToInteger(StringSubstr(timeinstring,StringLen(timeinstring)-1))+3;
   int prevSize,currSize;
   Print("timeinstring=",timeinstring,"   lastDigit=",lastDigit);
   prevSize=ArraySize(testArray);
   currSize=lastDigit;
   for (i=0;i<prevSize;i++) oldArray=StringConcatenate(oldArray,"|",DoubleToStr(testArray[i],0));
   ArrayResize(testArray,currSize);
   if (currSize>prevSize) for (i=prevSize;i<currSize;i++) testArray[i]=MathRand();   
   for (i=0;i<currSize;i++) newArray=StringConcatenate(newArray,"|",DoubleToStr(testArray[i],0));
   Print("prevSize=",prevSize,"  ,currSize=",currSize);
   Print(oldArray);
   Print(newArray);
   Print("Waiting a new tick...");
//----
   return(0);
  }
//+------------------------------------------------------------------+




 
Also pay attention to numerical sequence, which gives out the generator pseudo-casual number MathRand () without use of preliminary initialization MAthSrand () .

"MQL4: MathRand"
"MQL4: MathSrand"
12
New comment