MQL4 Reference Array Functions ArrayBsearch

ArrayBsearch

Searches for a specified value in a multidimensional numeric array sorted in the ascending order. The search is performed in the first dimension taking into account the AS_SERIES flag.

For searching in an array of double type

int  ArrayBsearch(
   const double&   array[],               // array for search
   double          value,                 // what is searched for
   int             count=WHOLE_ARRAY,     // count of elements to search for
   int             start=0,               // starting position
   int             direction=MODE_ASCEND  // search direction
   );

For searching in an array of float type

int  ArrayBsearch(
   const float&    array[],               // array for search
   float           value,                 // what is searched for
   int             count=WHOLE_ARRAY,     // count of elements to search for
   int             start=0,               // starting position
   int             direction=MODE_ASCEND  // search direction
   );

For searching in an array of long type

int  ArrayBsearch(
   const long&    array[],               // array for search
   long           value,                 // what is searched for
   int            count=WHOLE_ARRAY,     // count of elements to search for
   int            start=0,               // starting position
   int            direction=MODE_ASCEND  // search direction
   );

For searching in an array of int type

int  ArrayBsearch(
   const int&    array[],               // array for search
   int           value,                 // what is searched for
   int           count=WHOLE_ARRAY,     // count of elements to search for
   int           start=0,               // starting position
   int           direction=MODE_ASCEND  // search direction
   );

For searching in an array of short type

int  ArrayBsearch(
   const short&   array[],               // array for search
   short          value,                 // what is searched for
   int            count=WHOLE_ARRAY,     // count of elements to search for
   int            start=0,               // starting position
   int            direction=MODE_ASCEND  // search direction
   );

For searching in an array of char type

int  ArrayBsearch(
   const char&    array[],               // array for search
   char           value,                 // what is searched for
   int            count=WHOLE_ARRAY,     // count of elements to search for
   int            start=0,               // starting position
   int            direction=MODE_ASCEND  // search direction
   );

Parameters

array[]

[in] Numeric array for search.

value

[in] Value for search.

count=WHOLE_ARRAY

[in] Count of elements to search for. By default, it searches in the whole array.

start=0

[in] Starting index to search for. By default, the search starts at the first element.

direction=MODE_ASCEND

[in] Search direction. It can be any of the following values:

MODE_ASCEND searching in forward direction,
MODE_DESCEND searching in backward direction.

Return Value

The function returns index of a found element. If the wanted value isn't found, the function returns the index of an element nearest in value.

Note

Binary search processes only sorted arrays. To sort numeric arrays use the ArraySort() function.

Example:

   datetime daytimes[];
   int      shift=10,dayshift;
   // All the Time[] series are sorted in descendant mode
   ArrayCopySeries(daytimes,MODE_TIME,Symbol(),PERIOD_D1);
   if(Time[shift]>=daytimes[0]) dayshift=0;
   else
     {
      dayshift=ArrayBsearch(daytimes,Time[shift],WHOLE_ARRAY,0,MODE_DESCEND);
      if(Period()<PERIOD_D1) dayshift++;
     }
   Print(TimeToStr(Time[shift])," corresponds to ",dayshift," day bar opened at ",
         TimeToStr(daytimes[dayshift]));

Array FunctionsArrayCopy