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How to Subtract the current price from the previous price (of 2 hours) any hints.

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 Can anyone show me how to subtract the current price from the previous price. Thanks!

pls explain, the current price or the price from 2 hrs ago ?
tafadzwa:  Can anyone show me how to subtract the current price from the previous price (of 2 hours)
  1. If the chart period is small enough:
    #define HR0200  7200    // 2 * 3600
double priceM2Hr = Close[HR0200/Period()];
  2. If within one minute is close enough:
    #define HR0200  7200    // 2 * 3600
datetime now  = TimeCurrent(),
         m2Hr = now - HR0200;                       // 2 hours ago
int iM1 = iBarShift(NULL, PERIOD_M1, m2Hr);         // M1 bar 2 hours ago.
double priceM2Hr = iClose(NULL, PERIOD_M1, iM1);
  3. You insist on getting the price of a specific time you must keep every tick (price and time) in a dynamic array.
    Not compiled, not tested
    extern int TickHistoryMax.Seconds = 7200;
int start(){
    SaveTick();
    datetime now = Timecurrent();
    double   twoHrAgo = GetTick(now - 7200);
    :
}
#define TICK_DT   0
#define TICK_BID  1
    #define TICK_SIZE 2
double ticks[][TICK_SIZE];
void SaveTick(){
    int nBars = ArrayRange(ticks, 0);   ResizeBuffer(ticks, nBars+1);
    datetime now = TimeCurrent();
    ticks[0][TICK_DT] = now;        ticks[0][TICK_BID] = Bid;

    if (ticks[nBars][TICK_DT] - now > TickHistoryMax.Seconds*1.1){
        nBars = iGetTick(now + TickHistoryMax.Seconds);
        ArrayResize(ticks, nBars);
    }
}
double GetTick(datetime when){  return( ticks[iGetTick(when)][TICK_BID] );  }
int iGetTick(datetime when){
    int iOld = ArrayRange(ticks, 0)-1;
    int iNew = 0;
    while(iOld < iNew){
        int iTm = (iOld+iNew)/2;
        if (tick[iTm] <= when)   iOld = iTm; else iNew = iTm - 1;
    }
    return(iTm);
}
bool    ResizeBuffer(double& buffer[], int size){
    if (ArrayRange(buffer,0) != size){      // ArrayRange allows 1D or 2D arrays
        ArraySetAsSeries(buffer, false);    // Shift values B[2]=B[1]; B[1]=B[0]
        if (ArrayResize(buffer, size) <= 0){ DisableTrading(
            "ArrayResize [2] failed: " + GetLastError() );  return(false);  }
        ArraySetAsSeries(buffer, true);
    }
    return(true);
}
    Not compiled, not tested
WHRoeder:
  1. If the chart period is small enough:
  2. If within one minute is close enough:
  3. You insist on getting the price of a specific time you must keep every tick (price and time) in a dynamic array.
    Not compiled, not testedNot compiled, not tested

Thanks so much. Compiled an error shows up. Again thanks.
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