sSortTest - script for MetaTrader 5

The script contains several sorting methods for sorting of double[] array:

• Bubble sort;
• Selection sort;
• Insertion sort;
• Shell sort;
• Hoar sort;
• sorting using ArrayMinimum() and ArrayMaximum() functions.

There are 2 functions - ascending (Up) and descending (Dn) sort:

• SortBubbleUp(double & aAr[]);
• SortBubbleDn(double & aAr[]);
• SortSelectUp(double & aAr[]);
• SortSelectDn(double & aAr[]);
• SortInsertUp(double & aAr[]);
• SortInsertDn(double & aAr[]);
• SortShellUp(double & aAr[]);
• SortShellDn(double & aAr[]);
• SortHoareUp(double & aAr[]);
• SortHoareDn(double & aAr[]);
• SortSelectUpFst(double & aAr[]);
• SortSelectDnFst(double & aAr[]).

The script has several auxiliary functions:

• Check(double & aAr[]) - checks if array is already sorted (ascending). If array is not sorted, it prints "Error".
• ArrayAlertR(double & aAr[],int aDigits=0,string aHeader="") - prints array as a line. Arguments: double & aAr[] - array to print, int aDigits - precision (digits), string aHeader - additional string at the start of the line. This function may be useful to check the changes of the array during the sorting process.
• ArrayAlertC(double & aAr[],int aDigits=0,string aHeader="") - prints array as a column. Arguments: double & aAr[] - array to print, int aDigits - precision (digits),  string aHeader - additional string at the start of the line.

Sorting algorithms performance:

• Hoare - 8 ms;
• Shell - 78 ms;
• SelectFst - 126 ms;
• Selection - 582 ms;
• Insertion - 702 ms;
• Bubble - 1558 ms;

Fig. 1. Sort algorithms performance

The fastest sort method is Hoar sort (Quick sort), but it's recursive and needs a careful use.